Best Oura Ring Alternatives (2026): Price, Accuracy, No Subscription

Oura’s ring is only part of Oura’s price. Oura Ring 5 starts at $399, and the Oura Membership costs $5.99 a month or $69.99 a year in the US, with one month included for new members.¹² Without it, Oura says, “you’ll only be able to see your three daily Oura scores (Readiness, Activity, and Sleep), ring battery, basic profile information, app settings, and the Explore content.”²

Oura’s competitors in November 2026 fall into four groups. There are rings you buy once: Samsung Galaxy Ring, Circular Ring 2 and Ultrahuman Ring PRO.³⁴⁵ There are screenless bands: Fitbit Air, Amazfit Helio Strap, Garmin Cirqa and Polar Loop.⁶⁷⁸⁹ There are watches with their own readiness score, led by Apple Watch Series 12.¹⁰ And there is a sleep-only armband, the Garmin Index Sleep Monitor.¹¹

We make SensAI, an AI coaching app that reads Apple Health. It is not a ring and isn’t ranked below. The picks follow one rule: three-year required cost (device price plus any required subscription for three years), lowest first, with rings first and non-ring trackers second. Every price below was checked on the maker’s US page on 3 November 2026.

What is the best Oura Ring alternative in 2026?

The best Oura Ring alternatives in 2026 are Galaxy Ring ($299.99) for Samsung Galaxy phone owners, Circular Ring 2 ($349) on iPhone or Android, and Ultrahuman Ring PRO ($479) for battery life, and none lists a required subscription. Fitbit Air and Amazfit Helio Strap ($99.99 each) are the cheapest non-ring picks. Oura itself costs $399 plus $69.99 a year.^3456712

Pick	Best for	Price (Nov 2026)	Subscription	Readiness/recovery score name	iPhone?
Samsung Galaxy Ring	Samsung Galaxy phone owners	From $299.993	None listed on Samsung’s US page3	Energy Score3	No (Galaxy phone required3)
Circular Ring 2	A ring with ECG and no forced fee	$3494	“No forced subscription”4	Readiness4	Yes (iOS and Android4)
Ultrahuman Ring PRO	Longest battery of the rings we could check	$4795	None required; Ultrahuman Max optional5	Dynamic Recovery12	—
Oura Ring 4 (on sale)	The cheapest way to stay with Oura	From $3491	Membership $5.99/mo or $69.99/yr2	Readiness2	Yes (iOS and Android1314)
Google Fitbit Air	Lowest price with a free Readiness score	From $99.996	Optional (Google Health Premium6)	Readiness6	Yes (iOS 16.4 or higher15)
Amazfit Helio Strap	Budget band with no subscription	$99.997	None required7	BioCharge7	Yes7
Garmin Index Sleep Monitor	Sleep tracking only, on the upper arm	$169.9916	None required17	Body Battery11	—
Garmin Cirqa	Screenless band with Training Readiness	$199.998	None required8	Training Readiness, Body Battery8	Yes8
Polar Loop	Polar’s sleep-led recovery model	$199.999	None9	Nightly Recharge9	—
Apple Watch SE 3	Cheapest Apple Watch with a sleep score	From $24918	None	No Readiness app18	Yes19
Apple Watch Series 12	A screen plus built-in Readiness	From $39910	None	Readiness (0–1010)	Yes19
WHOOP One	Comparison only: costs more over time	$199/yr, hardware included20	Required20	Recovery20	—

US prices from each maker’s store, product page or press release, checked 3 November 2026, before tax. ”—” means the maker’s pages we checked don’t state it. Order: three-year required cost, lowest first, rings then non-ring trackers.

Three names are missing from that table on purpose.

• RingConn. RingConn holds a patent licence from Oura and is licensed to sell in the US.²¹ But its store would not load for us on 3 November 2026, so we list no RingConn price, battery or spec.
• Ultrahuman Ring AIR. It is not sold in the US. Ultrahuman’s US Ring AIR buy page returns “Page not found”, after an August 2025 ITC determination in Oura’s patent case.⁵²²
• Amazfit Helio Ring. It is no longer on Amazfit’s US store; the product page shows Amazfit’s 404 page.²³

If you are deciding between the three best-known rings only, see our head-to-head of Oura vs Galaxy Ring vs Ultrahuman.

How do Oura alternatives compare on price, battery and features?

Ultrahuman Ring PRO lasts up to 15 days, Oura Ring 5 six to nine days, and Galaxy Ring and Circular Ring 2 up to 7 days. Screenless bands last 7 to 10 days, WHOOP up to 14. Apple Watch lasts up to 18–24 hours. Only Oura and WHOOP require a subscription; Fitbit, Garmin and Ultrahuman sell optional ones.^{52434157892526220617}

Product	Form	Price (US, 3 Nov 2026)	Subscription required?	Score name	Battery	Phones	Peer-reviewed validation (studies we cite)
Oura Ring 5	Ring, titanium, from 2 g24	From $399; other finishes $4991	Yes for full app: $5.99/mo or $69.99/yr2	Readiness2	6–9 days24	iOS and Android24	None for Ring 5
Oura Ring 4	Ring	From $349; some finishes on sale1	Yes, same membership2	Readiness	5–8 days27	iOS and Android1314	Gen 4 in one ECG study28
Samsung Galaxy Ring	Ring	From $299.993	None listed3	Energy Score3	Up to 7 days (sizes 12–13); 6 smaller3	Samsung Galaxy only3	None on PubMed
Circular Ring 2	Ring with single-lead ECG4	$3494	No4	Readiness4	Up to 7 days4	iOS and Android4	None
Ultrahuman Ring PRO	Ring, titanium5	$4795	No (Max optional, from $29.975)	Dynamic Recovery12	Up to 15 days; 45 with PRO case5	—	No independent study
RingConn	Ring	Not verified	Not verified	—	Not verified	—	None on PubMed
Google Fitbit Air	Screenless band	From $99.996	No (Premium optional6)	Readiness6	Up to 7 days15	Android 11+, iOS 16.4+15	Older Fitbits only
Amazfit Helio Strap	Band, wrist or upper arm7	$99.997	No7	BioCharge7	Up to 10 days7	iPhone and Android7	None cited
Garmin Index Sleep Monitor	Upper-arm sleep band11	$169.9916	No17	Body Battery11	Up to 7 nights with continuous Pulse Ox11	—	None cited
Garmin Cirqa	Screenless band, wrist or arm8	$199.998	No (Connect+ optional817)	Training Readiness, Body Battery8	Up to 10 days8	iPhone or Android8	Garmin Fenix 6 only
Polar Loop	Screenless band	$199.999	No9	Nightly Recharge9	Up to 8 days9	—	Polar watches only
Apple Watch SE 3	Watch	From $24918	No	No Readiness app18	Up to 18 hours26	iPhone19	Older models only
Apple Watch Series 12	Watch	From $39910	No	Readiness (0–1010)	Up to 24 hours26	iPhone19	Series 8 and 9 only
WHOOP (5.0)	Screenless band	Hardware included20	Yes: One $199/yr, Peak $239/yr, Life $359/yr20	Recovery20	Up to 14 days25	—	WHOOP 4.0 and 3.0 only

Maker pages and press releases, checked 3 November 2026. ”—” means not stated; “Not verified” means the store would not load. Last column: studies cited on this page only.

Three differences the table hides:

• Fit. Oura Ring 5 comes in sizes 6–13 and fits differently from Ring 4 (4 to 15).²⁹ Galaxy Ring runs 5 to 15 and Ultrahuman Ring PRO 5–14.³⁰⁵ Oura asks you to wear its free sizing ring “for at least 24 hours, including while sleeping”.²⁴
• Bulk. Ring 5 is “40% smaller than Oura Ring 4”, 2.28 mm thick and from 2 grams.³¹²⁴ Ring PRO is 2.65 mm thick and 3.3–4.8 g.⁵
• Extras. Circular Ring 2 adds a 40-second single-lead ECG.⁴ Oura sells a Ring 5 Charging Case separately, good for “up to one month of battery”.³¹

Is Oura worth it, or is a ring without a subscription cheaper?

Over three years, Oura Ring 5 costs $608.97 with the annual membership: $399 for the ring and $209.97 in fees. Galaxy Ring ($299.99), Circular Ring 2 ($349) and Ultrahuman Ring PRO ($479) cost less, with no required subscription. Oura is worth it if you will use what the membership unlocks and value its research record.¹²³⁴⁵

Think of Oura as a purchase plus a utility bill. A no-subscription ring is the purchase alone.

Which Oura alternatives are cheaper than Oura over three years?

Every no-subscription pick is cheaper than Oura over three years. Fitbit Air and Amazfit Helio Strap cost $99.99, Garmin Cirqa and Polar Loop $199.99, Galaxy Ring $299.99, Circular Ring 2 $349 and Ultrahuman Ring PRO $479, against $608.97 for Oura Ring 5 and $558.97 for Ring 4. WHOOP costs $597 to $1,077.^67893451220

Option	Device price	Required subscription	3-year subscription	3-year total
Google Fitbit Air	$99.996	None (Premium optional)	$0	$99.99 (with Premium annual after the 3-month trial: $396.9932)
Amazfit Helio Strap	$99.997	None	$0	$99.99
Garmin Index Sleep Monitor	$169.9916	None	$0	$169.99
Garmin Cirqa	$199.998	None (Connect+ optional, $69.99/yr17)	$0	$199.99 (with Connect+: $409.9617)
Polar Loop	$199.999	None	$0	$199.99
Apple Watch SE 3 (no Readiness app)	$24918	None	$0	$249.00
Samsung Galaxy Ring (Galaxy phone required)	$299.993	None listed	$0	$299.99
Circular Ring 2	$3494	None	$0	$349.00
Apple Watch Series 12 (GPS)	$39910	None	$0	$399.00
Ultrahuman Ring PRO	$4795	None (Max optional, $99.99/yr5)	$0	$479.00 (with Max for 3 years: $778.97)
Oura Ring 4 (Silver, or Stealth on sale)	$3491	$69.99/yr2	$209.97	$558.97
WHOOP One	Hardware included	$199/yr20	$597	$597.00
Oura Ring 5, monthly plan	$3991	$5.99/mo × 35 paid months2	$209.65	$608.65
Oura Ring 5 (Silver or Black)	$3991	$69.99/yr2	$209.97	$608.97
Oura Ring 5 (other finishes)	$4991	$69.99/yr2	$209.97	$708.97
WHOOP Peak	Hardware included	$239/yr20	$717	$717.00
WHOOP Life	Hardware included	$359/yr20	$1,077	$1,077.00
RingConn	Not verified	Not verified	—	—

Computed from US prices checked 3 November 2026: device price plus required subscription for three years. Excludes tax, chargers, protection plans, shipping, trade-ins and optional subscriptions unless marked. Oura’s first month is included for new members, so the annual plan bills three times within 36 months.²

Against Oura Ring 5 at $608.97, Ultrahuman Ring PRO saves $129.97 over three years, Circular Ring 2 saves $259.97 and Galaxy Ring saves $308.98.¹²⁵⁴³

Put another way, three years of membership ($209.97) adds 52.6% to the $399 ring.¹² That is the real gap between Oura and a ring you buy once.

HSA and FSA funds work for most Oura store items and the membership.³³ Circular, Ultrahuman, the Garmin Index Sleep Monitor and the Helio Strap are also listed as HSA/FSA eligible.⁴⁵¹⁶⁷

What do you lose without an Oura membership?

Without a membership, Oura says “you’ll only be able to see your three daily Oura scores (Readiness, Activity, and Sleep), ring battery, basic profile information, app settings, and the Explore content.” You also lose the Oura API and, on Gen3 rings and later, Apple Health sharing. Your data stays saved and exportable as CSV.²¹³

Oura’s support page lists what the membership includes:²

• Detailed sleep analysis
• 24/7 heart rate tracking
• Third-party integrations like Strava
• Advanced temperature monitoring
• Blood Oxygen Sensing (SpO2)
• Daytime Stress and Resilience
• Dynamic activity goals
• Heart Health: Cardiovascular Age and Cardio Capacity (VO2 Max)
• Metabolic Health: Glucose Tracking and Meals
• Oura Labs
• Weekly to anniversary reports
• Women’s Health: Cycle Insights and Pregnancy Insights

Oura’s newest software sits behind the membership too. Health Radar, “personalized AI-enabled medical guidance provided in partnership with Counsel Health”, and GLP-1 Insights are for “Oura Members with Oura Ring Gen3 and newer models”.³¹

Before you cancel:

• Your data stays and can be exported “in CSV format through the Membership Hub”.²
• No pause, no lifetime plan. “There is no option to ‘pause’ an Oura Membership.”²
• Apple Health and Health Connect stop on Gen3 rings and later, which need “active membership”.¹³¹⁴
• Gen2 is the exception. “Gen2 users do not require an Oura Membership.”²

So Oura without a membership is a three-number ring.

Is the Oura Ring 4 sale a cheaper way into Oura?

Yes, by $50 over three years. Oura Ring 4 starts at $349, with Stealth marked down from $399 and Gold from $499, so three years with the membership costs $558.97 against $608.97 for Ring 5. You still pay the same $69.99 a year, and Ring 4 has independent HRV validation that Ring 5 does not.¹²⁷²²⁸

	Oura Ring 4	Oura Ring 5
Price (3 Nov 2026)	Silver $349; Stealth $349 (was $399); Gold $399 (was $499); Ceramic $399 (was $499127)	Silver or Black $399; other finishes $4991
Battery	5–8 days27	6–9 days24
Sizes	4 to 1529	6–1329
Size	Larger	“40% smaller than Oura Ring 4”31
Membership	Same: $5.99/mo or $69.99/yr2	Same2
Health Radar	Yes (Gen3 and newer31)	Yes31
Peer-reviewed HRV study	Yes, against ECG28	None found

Ring 4 is the newest Oura ring with published validation: Gen 4 had the highest overnight HRV agreement in a 2025 ECG study.²⁸ You give up Ring 5’s smaller shell and about a day of battery. Sale prices can change, and Oura offers “Free, easy returns within 30 days of purchase”.¹

Which smart rings have no subscription?

The best smart rings like Oura without a subscription are Samsung Galaxy Ring ($299.99, Galaxy phones only), Circular Ring 2 ($349, iOS and Android) and Ultrahuman Ring PRO ($479). Oura is the ring that needs a membership for its full app. Ultrahuman sells an optional add-on, Ultrahuman Max, from $29.97. We could not check RingConn’s store.³³⁴⁴⁵²

Ring	Required subscription	Optional paid tier	What the maker says
Samsung Galaxy Ring	None listed on the US page3	None listed	At launch in 2024: insights in Samsung Health “without a subscription”34
Circular Ring 2	None4	None listed	“No forced subscription”; “No subscription 14+ features included, free”4
Ultrahuman Ring PRO	None5	Ultrahuman Max: $29.97 for 3 months or $99.99 a year5	“there are no recurring subscription fees for accessing your data”5
Oura Ring 5 and Ring 4	Membership, $5.99/mo or $69.99/yr2	—	Without it, “only” three daily scores, battery, profile, settings and Explore2
RingConn	Not verified	Not verified	Store did not load on 3 Nov 2026
Amazfit Helio Ring	—	—	Not on Amazfit’s US store23

Checked 3 November 2026. Samsung’s 2024 statement comes from its launch announcement; its US page today lists no subscription price.³⁴³

Ultrahuman’s add-on is real money if you keep it. Max adds “Snoring & breathing insights” and “Cycle & ovulation insights”, among others.⁵ Kept three years, it takes Ring PRO to $778.97, more than Oura Ring 5.

Which Oura alternatives can you buy in the US, and what about the patent cases?

In the US you can buy Galaxy Ring ($299.99), Circular Ring 2 ($349) and Ultrahuman Ring PRO ($479) today. Ultrahuman Ring AIR is excluded after an August 2025 ITC determination. RingConn and Circular settled with Oura. Oura sued Ultrahuman again over Ring PRO in October 2026, and Samsung and Amazfit’s parent face a second ITC case.^34522213536

Ring	US status, 3 Nov 2026	What happened	Date
Ultrahuman Ring AIR	Not sold; US buy page “Page not found”5	ITC found a violation of Oura’s patent 11,868,178 and issued a limited exclusion order and cease-and-desist orders (337-TA-139822)	Issued 21 Aug 2025; final after Presidential review in Oct 20252237
Ultrahuman Ring PRO	On sale at $479, “Ships by November 4”5	US Customs (CBP) approved the redesign; Oura called it “not a final or comprehensive ruling”38	Mar 202638
		Oura filed a new patent suit in the Eastern District of Texas3940	22–23 Oct 20263539
RingConn	Licensed by Oura	ITC removed RingConn from the exclusion order and rescinded its cease-and-desist orders; RingConn “licensed a group of patents including the ‘178 Patent”21	Issued 9 Dec 202521
Circular Ring 2	On sale at $3494	ITC case terminated as to Circular “based on settlement”22	9 Jul 202422
Samsung Galaxy Ring	On sale from $299.993	Respondent in a second Oura ITC case (337-TA-146836)	Complaint filed 18 Nov 202536
		Samsung filed its own ITC complaint against Oura (337-TA-147841)	Filed 15 Dec 202541
Amazfit Helio Ring	Not on Amazfit’s US store23	Zepp Health, Amazfit’s parent, is a respondent in 337-TA-146836	Complaint filed 18 Nov 202536

Sources: Federal Register notices, Oura, TechCrunch and Bloomberg Law. Neither of the two later ITC cases has a decision we could confirm, so we give no decision date.

How it unfolded:

• 2024–2025, first ITC case. The case against Ultrahuman, RingConn and Circular ended for Circular on settlement in July 2024. In August 2025 the Commission found a violation of Oura’s patent 11,868,178.²² Oura said the orders were “effectively banning the import and sale of Ultrahuman smart rings in the U.S.”³⁷
• Late 2025, RingConn licence. Oura granted RingConn “a multi-year license … with RingConn making royalty payments to ŌURA”, and the ITC dropped RingConn from the orders in December.³⁷²¹
• March 2026, Ring PRO. US Customs approved Ultrahuman’s redesign; Oura said the decision was “not a final or comprehensive ruling”.³⁸
• October 2026, new suit. Oura sued in the Eastern District of Texas, asserting “additional patents, including design and utility patents”.³⁹ Bloomberg Law named them as D804,471 and 12,769,363.⁴⁰ Oura seeks damages and a permanent injunction. Ultrahuman CEO Mohit Kumar: “There is no court order affecting Ring Pro, and it remains available to customers in the U.S.”³⁵
• The second front. Oura’s second ITC complaint, filed in November 2025, names Samsung, Zepp Health, Reebok and Nexxbase (Noise and LunaZone).³⁶ Samsung filed its own ITC complaint against Oura in December 2025.⁴¹

What this means for you: Galaxy Ring, Circular Ring 2 and Ultrahuman Ring PRO were all on sale on their makers’ US sites on 3 November 2026.³⁴⁵ The open question is whether that lasts, which matters for replacements and warranty swaps. We are not lawyers, and none of the open cases had a ruling we could confirm.

Which ring is most accurate for sleep and HRV?

Oura has the most peer-reviewed validation of any ring, but much of it is Oura-funded or Oura-affiliated. Independent studies give a range, not one number: overnight HRV error of 5.96–7.15% against ECG in one study, but four-stage sleep accuracy of 53.18% in sleep-lab patients. None of the rival rings sold here has independent sleep or HRV validation on PubMed.²⁸⁴²

Overnight heart rate is the easy test for a ring. Sleep stages and daytime heart rate are the hard ones.

Study	Device(s)	People and reference	Key result	Funding / conflicts
Khan 2025, meta-analysis43	Oura (generations pooled)	6 studies, 388 people; PSG or actigraphy	No significant difference; total sleep −2.97 min	COI “None”
Agostinho 2026, meta-analysis44	Many wearables	16 studies, 10 pooled; healthy adults	“No device demonstrated consistently superior performance”; Oura Gen 3 closest on latency and efficiency	No COI field in PubMed record
Svensson 202445	Oura Gen3	96 adults; ambulatory PSG	Sleep/wake accuracy 91.7–91.8%; stage accuracy 75.5% (light) to 90.6% (REM)	Oura-funded
Robbins 202446	Oura Gen3, Fitbit Sense 2, Apple Watch Series 8	35 adults; PSG	Oura stage sensitivity 76.0–79.5%, “not different from PSG”	Oura grant; lead author on Oura’s Medical Advisory Board
Altini & Kinnunen 202147	Oura	106 people, 440 nights; PSG	Four-stage accuracy 79%	Oura employee and adviser
Miller 202248	Oura Gen2 and 5 others	53 adults; PSG and ECG	Oura multi-state agreement 61% (κ 0.43)	Lab receives WHOOP research support
Herberger 202542	Oura, SleepOn, Circul	Sleep-lab patients; PSG	Four-stage accuracy: Oura 53.18%, Circul 35.06%	No competing interests
Searles 202649	Oura, Fitbit Sense 2, two nearables	13 young and 19 older adults; PSG	Older adults: Oura total sleep bias −75.5 min, deep sleep +71.5 min	NIH-funded; no COI field
Dial 202528	Oura Gen3, Gen4, WHOOP 4.0, Garmin Fenix 6, Polar Grit X Pro	13 adults, 536 nights; ECG	HRV CCC 0.99 (Gen4), 0.97 (Gen3); MAPE 5.96%, 7.15%	No competing interests; US Air Force-funded
Kinnunen 202050	Oura	49 people; ECG	Nightly HR r² 0.996, HRV r² 0.980	First author at Oura Health
Cao 202251	Oura	35 people at home; ECG	Accurate nightly HR and RMSSD; high error for LF and LF:HF	“None declared”
Liang 202452	Oura	92 younger, 22 older adults; ECG	More than half of older participants exceeded 10% error for HRV	No conflicts
Gielen 202653	Oura Gen3 and 9 others	45 adults, daytime; ECG	Oura among four devices with daytime heart rate error of 9–14 bpm (MAE)	“None declared”
Gong 2025, systematic review54	Smart rings	107 studies	HR r² 0.996, HRV r² 0.980; 65% of studies moderate-to-high risk of bias	No conflicts
Shanmugam 202655	Ultrahuman Ring	442 users; no reference standard	Cardio Age gap −1.84 years (observational)	All authors Ultrahuman employees

PSG = polysomnography, the lab sleep test. CCC: 1.0 is perfect agreement. MAPE and MAE are average error. Funding and conflicts from each PubMed record.

The pattern: the most flattering numbers come from healthy adults in controlled settings, and several of those studies were paid for or co-written by Oura. Independent studies of patients and older adults are less kind.

The headline number has an origin. Gong’s 2025 review reports ring HRV r² of 0.980.⁵⁴ That matches Kinnunen 2020, whose first author was affiliated with Oura Health.⁵⁰ Independently, Liang 2024 found more than half of older participants exceeded a 10% HRV error.⁵²

Joshua Hagen, PhD, faculty director of the Human Performance Collaborative at The Ohio State University, was senior author of the Dial study, which declared no competing interests.⁵⁶²⁸ Oura Gen 3 and Gen 4 had the highest agreement for overnight HRV and for resting heart rate (resting heart rate CCC 0.97–0.98 against 0.91 for WHOOP 4.0; HRV 0.97–0.99 against 0.94).²⁸

Sleep staging depends on who is sleeping. At Charité Berlin’s Interdisciplinary Center of Sleep Medicine, Ingo Fietze’s team concluded that group-level “agreement masks substantial individual-level inaccuracies, prohibiting their use in clinical sleep medicine”.⁴² Rebecca Robbins of Brigham and Women’s Hospital and Harvard Medical School, who led the study finding Oura “not different from PSG”, is a member of the Oura Ring Medical Advisory Board.⁴⁶ The 2025 meta-analysis, with Michele Carr of the University at Buffalo as senior author, found no significant difference on any sleep measure it pooled.⁴³

Daytime is weaker. In Gielen 2026, Oura was among four devices with daytime heart rate error of 9–14 bpm (MAE), against 4.5 bpm for the Fitbit Charge 6.⁵³ Rings are built for nights.

Of the Oura papers cited on this page, seven are Oura-funded or Oura-affiliated, ten are independent of Oura, and one comes from a WHOOP-supported lab.^{454650475758594342494428515253546048} Our wearable HRV accuracy guide goes deeper.

Has any Oura rival been validated?

Not independently. PubMed lists no validation study of Galaxy Ring, RingConn or Amazfit’s ring, and none of Oura Ring 5. The only Ultrahuman ring paper is by Ultrahuman employees and has no reference standard. Studies of the Circul ring are about a Bodimetrics device, not Circular Ring 2. Every Oura rival is, so far, an unpublished bet.⁵⁵⁶¹⁶²

What a PubMed search on 3 November 2026 found:

• Galaxy Ring, RingConn, Amazfit Helio Ring, Oura Ring 5: no studies. The newest Oura ring studied is Gen 4.²⁸
• Ultrahuman: one 2026 paper on 442 users, with no ECG or PSG comparison; “All authors are employees of Ultrahuman Healthcare Pvt Ltd.”⁵⁵
• Circular Ring 2: none. “Circul” ring papers are about Bodimetrics devices.⁶¹⁶²

Cailbhe Doherty, PhD, an associate professor in University College Dublin’s School of Public Health, Physiotherapy and Sports Science, led a 2024 umbrella review of 24 systematic reviews covering 249 validation studies.⁶³⁶⁴ It found “approximately 11%” of consumer wearables validated for at least one biometric outcome.⁶⁴ Leaving Oura means choosing a ring whose accuracy nobody independent has published yet.

Should you trust a single night’s score?

No. One night is noisy for any ring. A 2026 analysis of about 2 million nightly HRV readings found at least five of seven nights were needed to match a full week’s HRV variability. Doherty’s umbrella review found wearables tend to overestimate total sleep, with errors typically above 10%. Watch the weekly trend, not one morning.⁶⁵⁶⁴

Read that study with its funding in mind: it was funded by WHOOP, and its first and senior authors work at WHOOP.⁶⁵

• Trust total sleep and timing more than minutes of deep or REM sleep.⁴²⁶⁴
• Compare a week against your own baseline.
• Your Oura Readiness history does not carry over to a Galaxy Ring Energy Score or Ultrahuman’s Dynamic Recovery.

Each brand’s score is its own currency. See how Garmin Body Battery, WHOOP Recovery and Oura Readiness are calculated.

Which Oura alternative is best for sleep apnea and blood oxygen?

Apple Watch has sleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3, “intended to detect signs of moderate to severe sleep apnea”. Galaxy Ring detects snoring, and Garmin’s Index Sleep Monitor tracks Pulse Ox all night. Published ring oximetry studies cover other devices and do not make consumer rings diagnostic.^102631166

Product	What it offers for breathing and blood oxygen
Apple Watch Series 12 and SE 3	Sleep apnea notifications, “intended to detect signs of moderate to severe sleep apnea” (also Series 9 or later and Ultra 2 or later1026)
Garmin Index Sleep Monitor	“Up to 7 nights of battery life with continuous Pulse Ox tracking”; tracks “breathing variations”11
Samsung Galaxy Ring	Snore detection; “Phone must be within 2 feet of user with snore detection enabled through Samsung Health app version 6.22 or later”3
Oura Ring 5	Red and infrared LEDs for blood oxygen; Blood Oxygen Sensing (SpO2) is part of the membership242
Ultrahuman Ring PRO	“Snoring & breathing insights” in the optional Ultrahuman Max5
Google Fitbit Air	“Red and infrared sensors for oxygen saturation (SpO2)”15
Garmin Cirqa	Pulse Ox8

Maker pages and press releases, checked 3 November 2026.

The ring oximetry studies on PubMed are about other devices:

• Circul (Bodimetrics), not Circular Ring 2. In 164 patients, it flagged an apnea-hypopnea index of 15 or more with 76% sensitivity and 100% specificity against PSG.⁶² Its authors include Bodimetrics scientific advisers.⁶¹
• An unnamed modified ring oximeter. Its desaturation index correlated with PSG at r = 0.87 in 25 patients; Apnimed funded and helped write the study.⁶⁶
• Movano Health’s ring. Error (RMSE) of 2.1% in low-oxygen lab tests; all authors work for Movano Health.⁶⁷

Doherty’s umbrella review put wearables’ blood oxygen error at “up to 2.0%”.⁶⁴ If you snore loudly or have been told you stop breathing at night, see a clinician.

Is there a ring that works with iPhone and Android?

Yes. Oura and Circular Ring 2 both work with iOS and Android. Samsung Galaxy Ring does not: Samsung requires a Samsung account registered on a Samsung Galaxy smartphone, and its Energy Score needs a Galaxy AI phone. Among non-ring picks, Fitbit Air, Amazfit Helio Strap and Garmin Cirqa also work on both platforms.^24431578

Device	iPhone	Android	Note
Oura Ring 5 and Ring 4	Yes	Yes	“Available on iOS and Android”24; Apple Health on iOS, Health Connect on Android1314
Circular Ring 2	Yes	Yes	“iOS and Android”4
Samsung Galaxy Ring	No	Samsung Galaxy only	“a Samsung account must be registered on your Samsung Galaxy smartphone”3
Google Fitbit Air	iOS 16.4+	Android 11+	Google account required15
Amazfit Helio Strap	Yes	Yes	Through the Zepp app7
Garmin Cirqa	Yes	Yes	Uses a “compatible iPhone or Android smartphone’s GPS”8

Maker pages, checked 3 November 2026.

Galaxy Ring is the trap for iPhone owners. If you switch platforms often, Oura and Circular are the safe ring choices.

Which Oura alternative should you buy?

Buy Galaxy Ring if you have a Samsung Galaxy phone. Buy Circular Ring 2 for a no-fee ring with ECG on any phone. Buy Ultrahuman Ring PRO for battery life. Buy Oura Ring 4 on sale to stay with Oura for less. Off the finger, Fitbit Air is cheapest, and Apple Watch Series 12 adds a screen.^3451610

The picks below follow the rule stated at the top: three-year required cost, lowest first, rings and then non-ring trackers.

Samsung Galaxy Ring vs Oura: best for Samsung Galaxy phone owners

Against Oura, Galaxy Ring costs $299.99 with no subscription price listed: $308.98 less than Oura Ring 5 over three years. It scores Energy instead of Readiness and lasts up to 7 days in sizes 12 and 13. Oura works on iPhone; Galaxy Ring needs a Samsung Galaxy phone. PubMed has no Galaxy Ring validation study.³¹²²⁴

Sizes run 5 to 15, and a full cradle charge gives up to 14 days away from an outlet.³⁰³ A Galaxy Ring 2 has been reported for “early 2027”, not announced.⁶⁸ Energy Score needs a Galaxy AI phone, and for Galaxy owners it is the cheapest ring we could price over three years.³

Skip it if you use an iPhone, or want peer-reviewed accuracy data: PubMed has none.

Circular Ring 2: best no-fee ring with ECG for iPhone and Android

Circular Ring 2 costs $349 with “No forced subscription”, works on iOS and Android, and adds a single-lead ECG to its PPG, accelerometer and temperature sensors. Battery is up to 7 days, and a portable case recharges it in about 60 minutes. It is sold under a settlement with Oura and is HSA/FSA eligible.⁴²²

Circular’s app shows a Readiness score, and returns run 14 days.⁴ We found no study of Circular Ring 2.

Skip it if you want independent validation or more than a week of battery.

Ultrahuman Ring PRO: best ring for battery life

Ultrahuman Ring PRO costs $479 in the US with “no recurring subscription fees for accessing your data”. It lasts up to 15 days, or 45 with the included PRO charging case, and stores up to 250 days of data on the ring. It is on sale despite a new Oura patent suit filed in October 2026.⁵³⁵

Sizes run 5–14, and “ProRelease Technology” lets the ring be cut safely if your finger swells.⁵ Ultrahuman Max is optional at $99.99 a year.⁵ Its only PubMed paper is by its own employees.⁵⁵

Skip it if you want to avoid a ring under active patent litigation.

Oura Ring 4 on sale: the cheapest way to stay with Oura

Oura Ring 4 starts at $349, with Stealth marked down to $349 from $399 on 3 November 2026. With the $69.99 annual membership, three years cost $558.97, $50 less than Ring 5. You keep Oura’s app and Health Radar, on the newest Oura ring with an independent ECG study.^12723128

It is a cheaper way into the membership, not out of it.

Skip it if the subscription is why you are leaving Oura.

Google Fitbit Air: cheapest tracker with a free Readiness score

Fitbit Air costs from $99.99 and measures a Readiness score with only a Google Account and the Google Health app. It lasts up to 7 days, works with Android 11 and iOS 16.4 or higher, and includes 3 months of Google Health Premium, which then renews at $9.99 a month. It ties for cheapest pick.⁶¹⁵

Premium plans “start at $9.99 per month or $99 per year” and add Google Health Coach.³²⁶ Fitbit Air also “looks out for signs of atrial fibrillation (AFib)”.⁶

Skip it if you want a ring, or will pay for Premium: then three years cost $396.99.⁶³²

Amazfit Helio Strap: best budget band with no subscription

Amazfit Helio Strap costs $99.99 with “No required subscription” and was in stock on Amazfit’s US store on 3 November 2026. It lasts up to 10 days, can be worn on the wrist or upper arm, works with iPhone and Android through the Zepp app, and scores recovery as BioCharge.⁷

It is HSA/FSA eligible and ships “to US & Canada only”.⁷ We found no published validation.

Skip it if you want a ring form factor.

Garmin Index Sleep Monitor: best for tracking sleep only

Garmin Index Sleep Monitor costs $169.99 and is worn on the upper arm. It tracks sleep stages, HRV status, breathing variations, skin temperature and Body Battery, with up to 7 nights of battery with continuous Pulse Ox. Garmin Connect’s existing features stay free, so no subscription is required.¹⁶¹¹¹⁷

It is the most direct swap if you only ever looked at Oura’s Sleep score.

Skip it if you would rather not add a band just for sleep.

Garmin Cirqa: best screenless band with Training Readiness

Garmin Cirqa costs $199.99, has no screen, and needs no subscription. It tracks Training Readiness, Body Battery, HRV status, sleep score, skin temperature and Pulse Ox, with up to 10 days of battery. You can wear it on the wrist or as an arm band, and it works with iPhone or Android.⁸

Garmin Connect+ is optional.¹⁷ Cirqa has no published validation; Garmin’s Fenix 6 scored 0.87 for HRV in Dial 2025.²⁸

Skip it if you want a ring.

Polar Loop: best for Polar’s Nightly Recharge

Polar Loop costs $199.99 and Polar calls it “a screen-free, subscription-free fitness band”. It lasts up to 8 days and stores 4 weeks of data. Its recovery score, Nightly Recharge, combines your sleep score with heart rate, HRV and breathing data to calculate overnight recovery. Polar also reports a Nightly HRV figure.⁹

The Loop is unvalidated; the Polar watch in Dial 2025 had the lowest HRV agreement, 0.82.²⁸

Skip it if HRV accuracy is why you bought Oura.

Apple Watch SE 3: cheapest Apple Watch, but no Readiness app

Apple Watch SE 3 costs from $249 and has a sleep score and HRV, but Apple lists its Readiness app as “not applicable”. Battery lasts up to 18 hours, or 32 in Low Power Mode. It does offer sleep apnea notifications. For an iPhone user, it replaces Oura’s sleep tracking, not its morning readiness verdict.¹⁸²⁶¹⁰

Apple Watch is the only device in our Help Center guide that shares HRV with Apple Health.¹⁹

Skip it if you want a ring-like battery.

Apple Watch Series 12: best if you want a screen and built-in Readiness

Apple Watch Series 12 costs from $399 and adds a Readiness app: “a single 0-10 score with a clear, actionable recommendation: Recover, Pace Yourself, Ready, or Go For It”. Overnight vitals now include recovery HRV, analyzed against your personal baseline. Battery lasts up to 24 hours, the honest trade-off against a ring’s week or more.¹⁰²⁶

Series 12 is untested; Series 9 and Ultra 2 underestimated HRV by 8.31 ms on average in a 2024 study with Doherty as senior author.⁶⁹

Skip it if you hate charging daily.

WHOOP One: for comparison, it costs more

WHOOP One costs $199 a year with the 5.0 sensor included, so three years cost $597, more than every other pick here and $11.97 less than Oura Ring 5. Peak ($239 a year) and Life ($359) cost $717 and $1,077. WHOOP 5.0 lasts up to 14 days per charge.²⁰²⁵

See our best WHOOP alternatives guide for WHOOP in detail.

Skip it if you want a ring, or want to stop paying a subscription.

Where does Oura still beat its alternatives?

Oura still leads on evidence, size and software. It has more peer-reviewed sleep and HRV validation than any other ring, including independent studies. Ring 5 is 40% smaller than Ring 4 and starts at 2 grams. Oura lists Cycle, Pregnancy and Menopause Insights, Cardiovascular Age and Health Radar. And it works on iOS and Android.^43283124

• The evidence record. Oura is the only ring in this guide with a meta-analysis behind it. Oura’s pooled sleep results showed no significant difference from PSG or actigraphy.⁴³ Its Gen 3 and Gen 4 rings led an independent ECG study of overnight HRV.²⁸
• Size. Ring 5 is 6.09 mm wide, 2.28 mm thick and from 2 grams.²⁴
• Women’s health. Oura lists Cycle Insights, Pregnancy Insights and Menopause Insights.²⁴ An independent 2024 study found Oura Gen2 finger temperature showed a pattern indicative of ovulatory cycles in 96 participants.⁶⁰ A 2023 study by authors who have consulted for Oura found women’s temperature variability did not differ significantly from men’s.⁵⁷
• Temperature and vascular age. Two 2026 studies with Michael Chee of the National University of Singapore, a member of Oura’s Medical Advisory Board, as senior author used the ring to time sleep onset from skin temperature and to estimate vascular age (average error 7.25 years).⁵⁸⁵⁹
• Software. Health Radar, AI medical guidance with Counsel Health and GLP-1 Insights for members.³¹
• Scale. Oura announced six million paid members on 22 October 2026.⁷⁰

The case for staying is evidence. The case for leaving is $209.97 of membership over three years.²

Which Oura alternative works best with iPhone and Apple Health?

On iPhone, Apple Watch is the only device in SensAI’s Help Center guide that writes HRV to Apple Health. Oura, Garmin, Polar, Fitbit and WHOOP write sleep, heart rate and workouts, but not HRV. Their proprietary scores never cross, so Readiness, Body Battery and Recovery stay in each brand’s app. Galaxy Ring cannot reach iPhone at all.¹⁹³

Device app	What it writes to Apple Health	HRV?	Score that stays behind
Apple Watch	Workouts, heart rate, HRV, sleep, VO2 Max	Yes	—
Oura	Sleep with stages, heart rate at one-minute intervals, active energy, steps, respiratory rate, workouts	No (no resting heart rate either)	Readiness
Garmin Connect	Workouts, heart rate, sleep, steps, calories; one-way	No	Body Battery, Training Readiness
Polar Flow	Workouts with average and workout heart rate, active energy, sleep, steps, weight	No (no continuous heart rate)	Proprietary scores
Google Health (Fitbit), app 5.05 or later, since August 2026	Exercise records, sleep, vitals, steps; two-way19	No	Proprietary scores
WHOOP	Sleep, resting heart rate, respiratory rate, blood oxygen, workouts, workout calories	No (WHOOP uses rMSSD; Apple Health stores SDNN)	Recovery, Strain

Source: the SensAI Help Center guide, last updated 25 September 2026.¹⁹ Samsung Galaxy Ring needs a Samsung Galaxy phone, so it cannot reach an iPhone app.³ Ultrahuman, Circular, RingConn and Amazfit are not covered by the guide, so we don’t list what they write.

The guide also notes that Oura data may not transfer if the app was not opened before midnight, so open it daily.¹⁹ And on Gen3 rings and later, Oura’s Apple Health sharing requires an active membership.¹³

For the field-by-field breakdown, see what Oura, WHOOP and Garmin sync to Apple Health.

What this means if you use a coaching app like SensAI

SensAI reads Apple Health only, so there is no Oura, Garmin or WHOOP account to link. If your ring or band’s iPhone app writes sleep and heart rate to Apple Health, those readings shape how hard Coach asks you to push. HRV reaches SensAI only from Apple Watch, and vendor scores such as Readiness, Body Battery and Recovery never transfer.¹⁹

In the Help Center’s words: “Sleep and overnight heart rate from your device shape how hard Coach asks you to push on a given day.”¹⁹ SensAI’s HRV tile “will read ‘No recent value’ unless an Apple Watch is providing it”.¹⁹

For devices the guide doesn’t cover, the rule is: “Any device whose iPhone app offers an Apple Health switch will work.”¹⁹ We don’t list what Ultrahuman, Circular, RingConn or Amazfit write. Galaxy Ring needs a Samsung Galaxy phone, so its data cannot reach an iPhone app like SensAI.³

To check what your device shares and set it up, read how to connect a wearable to SensAI through Apple Health.

Where SensAI falls short

SensAI is not a wearable, so you still need a ring, band or watch. It needs an iPhone on iOS 26 or later, and gets HRV only from Apple Watch. Your vendor score history stays behind, only about 30 days of workouts sync, and after a 7-day free trial it costs $6.99 a month or $69.99 a year.⁷¹¹⁹

• It is not a wearable. You still need one of the devices above.
• Needs an iPhone. SensAI reads Apple Health on your iPhone; the App Store listing requires iOS 26 or later, and Apple Watch requires watchOS 26 or later.⁷¹¹⁹
• HRV only from Apple Watch. No ring gives SensAI HRV, Oura included; only an Apple Watch fills SensAI’s HRV tile.¹⁹
• Your score history stays behind. Readiness, Body Battery and Recovery never transfer, so your Oura history doesn’t come with you.¹⁹
• Limited history import. SensAI syncs roughly the last 30 days of Apple Health workouts.¹⁹
• It is a subscription. The App Store listing says “Get full access free for 7 days. No subscription required to start.” After that, SensAI Premium costs $6.99 a month or $69.99 a year.⁷¹
• Few ratings so far. SensAI has 39 US App Store ratings, averaging 4.6.⁷¹

Frequently asked questions

These answers cover the questions people ask most about leaving Oura: rings without a subscription, the cheapest alternatives, Samsung Galaxy Ring on iPhone, Ultrahuman and RingConn in the US, Oura without a membership, ring accuracy, and whether an Oura alternative works with SensAI. Every price was checked on 3 November 2026.¹²¹⁹

Is there a ring like Oura without a subscription?

Yes. Circular Ring 2 ($349) has “No forced subscription” and works on iOS and Android. Ultrahuman Ring PRO ($479) has “no recurring subscription fees for accessing your data”. Samsung Galaxy Ring ($299.99) lists no subscription price, but needs a Samsung Galaxy phone. None has independent peer-reviewed validation yet.⁴⁵³

Oura is the ring in this group that needs a membership for its full app.²

What is the cheapest Oura alternative?

Google Fitbit Air and Amazfit Helio Strap, at $99.99 each with no required subscription, are the cheapest non-ring picks. The cheapest ring we could price is Samsung Galaxy Ring at $299.99, for Galaxy phone owners only. On any phone, Circular Ring 2 costs $349. Oura Ring 5 with three years of membership costs $608.97.⁶⁷³⁴²

Garmin’s Index Sleep Monitor ($169.99) is the cheapest option if you only want sleep data.¹⁶

Does the Samsung Galaxy Ring work with iPhone?

No. Samsung says “a Samsung account must be registered on your Samsung Galaxy smartphone” to start using Galaxy Ring, and its Energy Score insights require a compatible Samsung Galaxy AI phone. So Galaxy Ring cannot be set up with an iPhone or send data to iPhone apps. On iPhone, consider Oura, Circular Ring 2 or an Apple Watch.³²⁴⁴

Samsung lists Galaxy Ring from $299.99 on its US site.³

Is Ultrahuman banned in the US?

The Ring AIR is: an August 2025 ITC determination led to exclusion orders, and Ultrahuman’s US Ring AIR page returns “Page not found”. The redesigned Ring PRO is on sale in the US at $479. Oura filed a new patent suit over it in October 2026, and Ultrahuman says no court order affects Ring PRO.²²⁵³⁵

US Customs approved the PRO’s redesign in March 2026; Oura called that decision “not a final or comprehensive ruling”.³⁸

Is RingConn sold in the US?

RingConn is licensed to sell in the US. It licensed a group of Oura’s patents, and in December 2025 the ITC removed RingConn from its exclusion order and rescinded the cease-and-desist orders against it. We could not load RingConn’s store on 3 November 2026, so we give no price, battery or spec for it.²¹³⁷

PubMed has no validation study of a RingConn ring.

Does Oura work without a membership?

Partly. Without an active membership, Oura says “you’ll only be able to see your three daily Oura scores (Readiness, Activity, and Sleep), ring battery, basic profile information, app settings, and the Explore content.” You lose the API and, on Gen3 and later, Apple Health sharing. Gen2 rings need no membership.²¹³

The membership costs $5.99 a month or $69.99 a year in the US.²

Is Oura more accurate than other rings?

Oura has the most peer-reviewed validation of any ring, so it is the one you can check. Independent studies found overnight HRV error of 5.96–7.15% against ECG, but weaker sleep staging in patients and older adults. Rival rings have no independent validation on PubMed, so nobody can say they are better or worse.²⁸⁴²⁴⁹

Several of the most favorable Oura studies were Oura-funded or Oura-affiliated.⁴⁵⁴⁶⁵⁰

Can I use an Oura alternative with SensAI?

Yes, if its iPhone app writes to Apple Health. SensAI reads Apple Health only, so there is no vendor account to link. Sleep and overnight heart rate from your device shape how hard Coach asks you to push, but HRV reaches SensAI only from Apple Watch. Galaxy Ring needs a Samsung Galaxy phone, so it cannot reach SensAI on iPhone.¹⁹³

Setup is covered in the Help Center guide linked in the Apple Health section above.

Should you leave Oura for an alternative?

Leave if you mainly use Oura’s three daily scores: Galaxy Ring, Circular Ring 2 or Ultrahuman Ring PRO cost $129.97 to $308.98 less over three years, with no required subscription. Stay if you use the membership features or want a ring with published, partly independent validation. Oura Ring 4 on sale is the cheaper middle path.^2345128

A simple test: open the Oura app and count what you look at each week. If it is three numbers, you are paying $69.99 a year for features you skip. If it is cycle insights, Cardiovascular Age and detailed sleep, the membership is doing its job.²

Whichever you choose, treat any morning score as a guide, not an instruction, and judge it over a week rather than a night.⁶⁵⁶⁴

And if you want a coach whose daily push follows the sleep and overnight heart rate your device writes to Apple Health, that is what SensAI does on iPhone.¹⁹

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References

Footnotes

1. Oura. “Oura Store.” US store — “Oura Ring 5 From $399” (Silver $399, Black $399; Gold, Deep Rose, Stealth and Brushed Silver $499); “Oura Ring 4 From $349” (Silver $349; Stealth $349, regular $399 struck through; Gold $399, regular $499 struck through); Oura Ring 4 Ceramic Midnight and Cloud $399 (regular $499 struck through); “Free, easy returns within 30 days of purchase”; “Free trial month for new Oura Members”; “Limited 1-year warranty”. Accessed November 3, 2026. https://ouraring.com/store ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²²

2. Oura. “Oura Membership.” Oura Support, last updated October 29, 2026 — “Oura Membership is available for $5.99/month and $69.99/year in the US”; “New members receive one included month of Oura Membership”; “Oura Membership only applies to Gen3 and newer.”; “Gen2 users do not require an Oura Membership”; “Without an active membership, you’ll only be able to see your three daily Oura scores (Readiness, Activity, and Sleep), ring battery, basic profile information, app settings, and the Explore content. Without an active membership, you cannot access the Oura API, but you can still download your personal data through the Membership Hub.”; “If you cancel your membership, and do not delete your account, all of your Oura data and account information will remain securely saved”; “you can export all of your Oura data in CSV format through the Membership Hub”; membership includes detailed sleep analysis, 24/7 heart rate tracking, third-party integrations like Strava, advanced temperature monitoring, Blood Oxygen Sensing (SpO2), Daytime Stress, dynamic activity goals, Heart Health (Cardiovascular Age, Cardio Capacity (VO2 Max)), Metabolic Health (Glucose Tracking, Meals), Oura Labs, Resilience, weekly to anniversary reports and Women’s Health (Cycle Insights, Pregnancy Insights); “There is no option to ‘pause’ an Oura Membership.”; “There currently is no option to purchase or upgrade to a Lifetime Membership.”; “Oura on the Web has been discontinued as of October 5, 2026.” Accessed November 3, 2026. https://support.ouraring.com/hc/en-us/articles/4409086524819-Oura-Membership ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵ ↩³⁶ ↩³⁷ ↩³⁸ ↩³⁹ ↩⁴⁰

3. Samsung. “Galaxy Ring.” Samsung US — “From $299.99 before trade-in”; “To start using Galaxy Ring, a Samsung account must be registered on your Samsung Galaxy smartphone.”; “Energy Score insights track data and require compatible Samsung Galaxy AI phone, Samsung Health app and Samsung account.”; “Slip it on and forget it with a seven-day charge” (“For sizes 12 and 13; up to 6 days for smaller sizes”); “Combined with a full cradle charge, you can use Galaxy Ring for up to 14 days without plugging into an outlet”; “10ATM … and IP68”; snore detection: “Phone must be within 2 feet of user with snore detection enabled through Samsung Health app version 6.22 or later”. No subscription price listed. Accessed November 3, 2026. https://www.samsung.com/us/rings/galaxy-ring/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵ ↩³⁶ ↩³⁷ ↩³⁸ ↩³⁹

4. Circular. Circular Ring 2 home page — “$349 USD · HSA/FSA eligible”; “$349 · 14-day returns · 1-year warranty · HSA/FSA eligible”; “$349 · No forced subscription.”; “No subscription 14+ features included, free”; “No mandatory subscription”; “Single-lead ECG, 3-LED PPG, accelerometer, temperature”; “ECG 40 seconds”; “Up to 7 days, portable charging case in about 60 minutes”; “iOS and Android”; app mock-up shows “Readiness 78 /100” under “Recovery”. Accessed November 3, 2026. https://www.circular-ring.com/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴

5. Ultrahuman. “Ring PRO — Buy.” US store — “Ring PRO (with PRO charging case) $479”; “Ships by November 4”; “Pick up at a Best Buy near you”; “there are no recurring subscription fees for accessing your data. Ring PRO is available for a simple, one-time purchase”; Ultrahuman Max “From $29.97” (3 months $29.97; 1 year $99.99), including “Heart health & recovery”, “Cycle & ovulation insights” and “Snoring & breathing insights”; “PowerPlugs add deeper heart, breathing, cycle and fitness insights”; “HSA/FSA Eligible”; battery “Up to 15 days (Turbo Mode ~12 days, Chill Mode 15+ days). Up to 45 days with PRO Charging Case”; sizes 5–14; thickness 2.65 mm (varies by size); weight 3.3–4.8 g; titanium; 100m water resistance; “ProRelease Technology — ring can be safely cut in case of finger swelling”; “Up to 250 days of data”. ultrahuman.com/us/ring-air/buy/ returned “Ultrahuman | Page not found” on November 3, 2026. Accessed November 3, 2026. https://www.ultrahuman.com/us/ring-pro/buy/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵

6. Google Store. “Google Fitbit Air.” US product page — “From $99.99”; “Start strong with 3 months of Google Health Premium on us.” (“Offer ends 05/26/27 … Automatically renews for $9.99/mo after trial”); “Google Fitbit Air measures your Cardio Load and Readiness score” (footnote: requires “Google Account and Google Health app”); “Unlock personalized coaching built with Gemini, included with a Google Health Premium membership”; “some features require Google Health Premium membership”; “looks out for signs of atrial fibrillation (AFib)”. Accessed November 3, 2026. https://store.google.com/us/product/google_fitbit_air?hl=en-US ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷

7. Amazfit. “Helio Strap.” Amazfit US product page — Helio Strap “$99.99”, in stock (“Add to cart”); “Ships to US & Canada only”; Helio Strap Pro “$199.99” (“Up to 11-day battery”, “Muscle-load analysis”); “No required subscription”; “No subscription fees”; “Up to 10 days of battery life with typical use”; “Wear on your wrist or upper arm”; “Energy Levels: BioCharge™”; “Sleep heart rate variability”, “Sleep score”; “Helio Strap works with both iPhone and Android devices through the Zepp App”; “HSA/FSA eligible”. Accessed November 3, 2026. https://us.amazfit.com/products/helio-strap ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹

8. Garmin. “Meet CIRQA Smart Band: the screen-free health and fitness tracker from Garmin.” Press release, July 21, 2026 — “its first screen-free smart band that tracks advanced fitness and wellness features—all without the need for a subscription”; “Available now, CIRQA Smart Band has a suggested retail price of $199.99.”; “up to 10 days of battery life”; “Can be worn around the wrist or as an arm band”; “wrist-based heart rate, Body Battery energy monitoring, Pulse Ox, stress, skin temperature”; “a sleep score”; “heart rate variability”; “training readiness”, “HRV status, VO2 max and training status”; “Connect to a compatible iPhone or Android smartphone’s GPS”. Accessed November 3, 2026. https://www.garmin.com/en-US/newsroom/press-release/wearables-health/meet-cirqa-smart-band-the-screen-free-health-and-fitness-tracker-from-garmin/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸

9. Polar. “Polar Loop.” Polar USA product page — “$199.99”; “a screen-free, subscription-free fitness band”; “up to 8 days on a single charge and 4 weeks of onboard memory”; “Nightly Recharge — Combines your sleep score with heart rate, HRV, and breathing data to calculate your overnight recovery”; “Nightly HRV”. Accessed November 3, 2026. https://www.polar.com/us-en/loop ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

10. Apple. “Introducing Apple Watch Series 12, with the all-new Health Sensing System.” Apple Newsroom, September 9, 2026 — “Apple Watch Series 12 starts at $399 (U.S.)”; Readiness: “a single 0-10 score with a clear, actionable recommendation: Recover, Pace Yourself, Ready, or Go For It”, which “analyzes a user’s recent activity, training load, vitals, and sleep score”; “HRV … is now measured up to 24 times more often”; “Overnight vitals now includes recovery HRV measurements analyzed against a user’s personal baseline”; sleep apnea notifications “available on Apple Watch Series 9 or later, Apple Watch Ultra 2 or later, and Apple Watch SE 3”, “intended to detect signs of moderate to severe sleep apnea”; “Just 15 minutes now gets up to 12 hours of additional battery life”. Accessed November 3, 2026. https://www.apple.com/newsroom/2026/09/introducing-apple-watch-series-12-with-the-all-new-health-sensing-system/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

11. Garmin. “Rest easy with the Index Sleep Monitor smart sleep band from Garmin.” Press release, June 18, 2025 — “worn on the upper arm”; “up to 7 nights of battery life with continuous Pulse Ox tracking”; “sleep stages, heart rate variability (HRV) status, breathing variations, skin temperature and more”; Body Battery. Accessed November 3, 2026. https://www.garmin.com/en-US/newsroom/press-release/sports-fitness/rest-easy-with-the-index-sleep-monitor-smart-sleep-band-from-garmin/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

12. Ultrahuman. “Ring PRO.” US product page — “Dynamic Recovery adapts to your body in real time … recalibrates your recovery score”; “The AFib Detection & Cardio Adaptability PowerPlugs discreetly monitor your heart rhythm every night”. Accessed November 3, 2026. https://www.ultrahuman.com/us/ring-pro/ ↩ ↩²

13. Oura. “Apple Health Integration.” Oura Support, last updated October 14, 2026 — availability “Gen2”; “Gen3 or later with active membership”; “iOS only”. Accessed November 3, 2026. https://support.ouraring.com/hc/en-us/articles/360025438734-Apple-Health-Integration ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

14. Oura. “Health Connect by Android Integration.” Oura Support, last updated August 19, 2026 — availability “Gen2”; “Gen3 or later with active membership”; “Android only”. Accessed November 3, 2026. https://support.ouraring.com/hc/en-us/articles/10786105824531-Health-Connect-by-Android-Integration ↩ ↩² ↩³ ↩⁴

15. Google Store. “Google Fitbit Air tech specs.” — “Battery life of up to 7 days”; “Charge time (0-100%): 90 min”; “1 day of battery life in 5 min”; “Android 11.0 or higher”; “Apple iOS 16.4 or higher”; Google account required; “Red and infrared sensors for oxygen saturation (SpO2)”; device temperature sensor. Accessed November 3, 2026. https://store.google.com/us/product/google_fitbit_air_specs?hl=en-US ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

16. Garmin. “Index Sleep Monitor.” Garmin US product page — “$169.99 USD”; “Pay with HSA/FSA”; sizes S/M and L/XL. Accessed November 3, 2026. https://www.garmin.com/en-US/p/1650098/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

17. Garmin. “Elevate your health and fitness goals with Garmin Connect+.” Press release, March 27, 2025 — “monthly ($6.99/month) or annual ($69.99/year)”; “All existing features and data in Garmin Connect will remain free.” Accessed November 3, 2026. https://www.garmin.com/en-US/newsroom/press-release/wearables-health/elevate-your-health-and-fitness-goals-with-garmin-connect/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

18. Apple. “Apple Watch” and “Apple Watch SE 3.” — “Apple Watch SE 3 … From $249”; “Readiness app not applicable”; Sleep score “analyzes … sleep duration, bedtime consistency, how often you wake up, and time spent in each sleep stage”. Accessed November 3, 2026. https://www.apple.com/watch/ ; https://www.apple.com/apple-watch-se-3/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

19. SensAI Help Center. “How to Connect Garmin, Oura, WHOOP, Strava, or Any Wearable to SensAI Through Apple Health.” Last updated September 25, 2026 — “Do I link my Garmin, Oura, or WHOOP account inside SensAI? No.”; “Will Coach see my HRV? Only from Apple Watch. Garmin, Oura, WHOOP, COROS, Polar, and Fitbit do not write HRV to Apple Health.”; Apple Watch “is the only device on this list that shares HRV”; “Their proprietary scores never cross”; “Body Battery, Recovery, and Readiness never transfer”; “Sleep and overnight heart rate from your device shape how hard Coach asks you to push on a given day.”; “The HRV tile will read ‘No recent value’ unless an Apple Watch is providing it.”; “It syncs roughly the last 30 days of Apple Health workouts.”; “Any device whose iPhone app offers an Apple Health switch will work”; “If the app can write Workouts and Heart Rate to Apple Health, SensAI can read them.”; per-device lists for Apple Watch, Garmin, Oura, WHOOP, Polar and Fitbit (Google Health app 5.05 or later). https://www.sensai.fit/help/connect-wearable-to-sensai-apple-health ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹

20. WHOOP. “Membership Pricing.” WHOOP Support, last published May 28, 2026 — WHOOP One “$199 per year” in the US, with “5.0 Sensor, Obsidian SuperKnit band, and a Wireless PowerPac”; WHOOP Peak $239; WHOOP Life $359 with “5.0 Medical Grade Sensor”; One includes “Core fitness and recovery insights, Strain & Sleep tracking, Strength Trainer, VO2 Max, AI Coach, Journal & Behavior Impact, Trends”; “Month to Month subscriptions are no longer available as a standard signup option but remain accessible in select renewal scenarios”. Accessed November 3, 2026. https://support.whoop.com/s/article/Membership-Pricing?language=en_US ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

21. U.S. International Trade Commission. Notice modifying remedial orders as to RingConn, Investigation No. 337-TA-1398. Federal Register, December 12, 2025 (“Issued: December 9, 2025”) — limited exclusion order modified “to remove reference to RingConn”; cease-and-desist orders rescinded as to RingConn; per the joint petition, “RingConn licensed a group of patents including the ‘178 Patent”. Accessed November 3, 2026. https://www.govinfo.gov/content/pkg/FR-2025-12-12/html/2025-22586.htm ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

22. U.S. International Trade Commission. Notice of final determination, Investigation No. 337-TA-1398. Federal Register, August 26, 2025 (“Issued: August 21, 2025”) — violation of Section 337 as to U.S. Patent No. 11,868,178; limited exclusion order and cease-and-desist orders; respondents included Ultrahuman and RingConn entities; “The Commission terminated the investigation as to respondent Circular SAS based on settlement. Order No. 12 (July 9, 2024)”. Accessed November 3, 2026. https://www.govinfo.gov/content/pkg/FR-2025-08-26/html/2025-16316.htm ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

23. Amazfit. Helio Ring US product URL — rendered Amazfit’s 404 page (canonical us.amazfit.com/404) on November 3, 2026. https://us.amazfit.com/products/helio-ring ↩ ↩² ↩³

24. Oura. “Oura Ring 5 — Silver.” Product page — “6-9 days* of battery life”; “Charges in about 80 minutes”; width 6.09mm, thickness 2.28mm; “From 2 grams”; titanium; “Waterproof up to 100m/328 ft”; “IP68”; red and infrared LEDs for blood oxygen; “Available on iOS and Android”; “Free Sizing Kit”; “wear the sizing ring for at least 24 hours, including while sleeping”; features “Readiness”, “Sleep”, “Activity”, “Daytime Stress and Resilience”, “Heart Health: Cardiovascular Age and Cardio Capacity”, “Women’s Health: Cycle Insights, Pregnancy Insights, and Menopause Insights”. Accessed November 3, 2026. https://ouraring.com/store/rings/oura-ring-5/silver ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵

25. WHOOP. “Unlock New with WHOOP 5.0.” WHOOP Support, last published August 27, 2025 — “Members can now go up to 14 days on a single charge”. Accessed November 3, 2026. https://support.whoop.com/s/article/Unlock-New-with-WHOOP-5-0?language=en_US ↩ ↩² ↩³

26. Apple. “Compare Apple Watch models.” — Series 12 GPS “From $399”, GPS + Cellular “From $499”; Ultra 4 “From $799”; Readiness app on Series 12 and Ultra 4; “Recovery HRV” on Series 12 and Ultra 4, “HRV” on SE 3; sleep apnea notifications footnote; battery Series 12 “Up to 24 hours” (Low Power “Up to 38 hours”), Ultra 4 “Up to 50 hours”, SE 3 “Up to 18 hours” (Low Power 32 hours). Accessed November 3, 2026. https://www.apple.com/watch/compare/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

27. Oura. “Oura Ring 4 — Stealth.” Product page — “Stealth – $349 $399”; “5-8 days** of battery life per charge”; “Typically charges in 20-80 minutes”. Accessed November 3, 2026. https://ouraring.com/store/rings/oura-ring-4/stealth ↩ ↩² ↩³ ↩⁴ ↩⁵

28. Dial MB, Hollander ME, Vatne EA, Emerson AM, Edwards NA, Hagen JA. “Validation of nocturnal resting heart rate and heart rate variability in consumer wearables.” Physiol Rep. 2025;13(16):e70527. doi:10.14814/phy2.70527. PMID: 40834291. https://pubmed.ncbi.nlm.nih.gov/40834291/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷

29. Oura. “Sizing.” — Oura Ring 5 “available in sizes 6–13”; “Its redesigned interior fits differently than Oura Ring 4”; “Oura Ring 4 sizing runs from size 4 to 15”. Accessed November 3, 2026. https://ouraring.com/sizing ↩ ↩² ↩³

30. Samsung. Galaxy Ring sizing support answer (ANS10003278) — “Available in a range of sizes from 5 to 15.” Accessed November 3, 2026. https://www.samsung.com/us/support/answer/ANS10003278/ ↩ ↩²

31. Oura. “Introducing Oura Ring 5: The World’s Smallest Smart Ring.” The Pulse blog, May 28, 2026 — “40% smaller than Oura Ring 4”; the Ring 5 Charging Case, sold separately, gives “up to one month of battery”; “Health Radar, personalized AI-enabled medical guidance provided in partnership with Counsel Health, GLP-1 Insights, and more. These software features will be available to Oura Members with Oura Ring Gen3 and newer models.” Accessed November 3, 2026. https://ouraring.com/blog/introducing-oura-ring-5/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

32. Google. “A new era for your health and wellness.” The Keyword, May 7, 2026 — “Premium plans start at $9.99 per month or $99 per year”. Three-year figure computed: $99.99 device plus $99 a year for three years. Accessed November 3, 2026. https://blog.google/products-and-platforms/products/google-health/google-health-fitbit/ ↩ ↩² ↩³

33. Oura. “Purchase with HSA or FSA Funds.” Oura Support, last updated August 31, 2026 — “Most items available on the Oura online store, including taxes and shipping, can be purchased with HSA or FSA funds. However, the two-year and three-year Extend Protection Plans are not eligible.”; recurring membership payable with an HSA or FSA card. Accessed November 3, 2026. https://support.ouraring.com/hc/articles/19777137314579-Purchase-with-HSA-or-FSA-Funds ↩

34. Samsung Newsroom. “Samsung’s Expanded Wearables Portfolio Unlocks Intelligent Health Experiences for All.” July 10, 2024 — “All data and insights are integrated into Samsung Health for seamless access within one cohesive platform without a subscription.” Launch-era statement, cited as historical. https://news.samsung.com/global/samsungs-expanded-wearables-portfolio-unlocks-intelligent-health-experiences-for-all ↩ ↩² ↩³

35. Jagmeet Singh. “Oura sues rival Ultrahuman again, threatening its US smart ring comeback.” TechCrunch, October 22, 2026 — Ultrahuman CEO Mohit Kumar: “There is no court order affecting Ring Pro, and it remains available to customers in the U.S.”; Oura seeks damages and a permanent injunction; “with RingConn and Circular agreeing to pay royalties to Oura to continue selling their products”. Accessed November 3, 2026. https://techcrunch.com/2026/10/22/oura-sues-rival-ultrahuman-again-threatening-its-u-s-smart-ring-comeback/ ↩ ↩² ↩³ ↩⁴ ↩⁵

36. U.S. International Trade Commission. Notice of institution, Investigation No. 337-TA-1468. Federal Register, December 22, 2025 (“Issued: December 18, 2025”) — complaint filed November 18, 2025 by Ouraring Inc., amended December 9, 2025; patents 11,868,178, 12,353,244, 12,346,159 and 12,222,759; respondents Samsung Electronics Co., Ltd. and Samsung Electronics America; Reebok International Limited and Reebok International Ltd., LLC; Zepp Health Corporation, Zepp Inc. (d/b/a Zepp Health) and Zepp North America; Nexxbase Marketing Pvt. Ltd. (d/b/a Noise and LunaZone); accused products “smart ring wearable devices, systems, and components thereof”. Accessed November 3, 2026. https://www.govinfo.gov/content/pkg/FR-2025-12-22/html/2025-23584.htm ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

37. Oura. “Oura Secures Decisive Legal Victory with ITC Patent Ruling.” Oura blog, October 21, 2025 — “the ITC’s final ruling enforces exclusion and cease-and-desist orders, effectively banning the import and sale of Ultrahuman smart rings in the U.S.”; “ŌURA has granted RingConn a multi-year license … with RingConn making royalty payments to ŌURA”. Accessed November 3, 2026. https://ouraring.com/blog/oura-itc-case/ ↩ ↩² ↩³ ↩⁴

38. Jagmeet Singh. “Ultrahuman ramps up US push with Ring Pro as Oura tightens its grip.” TechCrunch, March 24, 2026 — approval “granted by U.S. Customs and Border Protection (CBP)”; Oura: “The recent CBP decision is not a final or comprehensive ruling on Ultrahuman’s new design”. Accessed November 3, 2026. https://techcrunch.com/2026/03/24/ultrahuman-ramps-up-u-s-push-with-ring-pro-as-oura-tightens-grip/ ↩ ↩² ↩³ ↩⁴

39. Oura. Blog post on its new patent complaint against Ultrahuman, October 23, 2026 — “Today we filed a new complaint in the U.S. District Court for the Eastern District of Texas against Ultrahuman for patent infringement”; “the suit we filed today asserts additional patents, including design and utility patents”. Accessed November 3, 2026. https://ouraring.com/blog/ultrahuman-patent-infringement/ ↩ ↩² ↩³

40. Bloomberg Law. “Oura Makes More Patent Claims Against Ultrahuman Smart Rings.” October 23, 2026 — “The Ultrahuman Ring PRO infringes US Patent Nos. D804,471 and 12,769,363, Oura said Thursday in the US District Court for the Eastern District of Texas”; “The ‘363 patent … was issued by the US Patent and Trademark Office on Oct. 20.” Accessed November 3, 2026. https://news.bloomberglaw.com/ip-law/oura-makes-more-patent-claims-against-ultrahuman-smart-rings ↩ ↩²

41. U.S. International Trade Commission. Notice of institution, Investigation No. 337-TA-1478. Federal Register, January 16, 2026 (“Issued: January 14, 2026”) — complaint filed December 15, 2025 by Samsung Electronics Co., Ltd. and Samsung Electronics America; patents 10,642,359, 10,945,677, 10,231,675 and 10,978,789; respondent Ouraring, Inc. Accessed November 3, 2026. https://www.govinfo.gov/content/pkg/FR-2026-01-16/html/2026-00852.htm ↩ ↩² ↩³

42. Herberger S, Aurnhammer C, Bauerfeind S, Bothe T, Penzel T, Fietze I. “Performance of wearable finger ring trackers for diagnostic sleep measurement in the clinical context.” Sci Rep. 2025;15(1):9461. doi:10.1038/s41598-025-93774-z. PMID: 40108409. https://pubmed.ncbi.nlm.nih.gov/40108409/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

43. Khan S, Ibrahim AF, Vasudevan SS, Quatela OE, Nanu DP, Carr MM. “The Oura Ring Versus Medical-Grade Sleep Studies: A Systematic Review and Meta-Analysis.” OTO Open. 2025;9(4):e70181. doi:10.1002/oto2.70181. PMID: 41230431. https://pubmed.ncbi.nlm.nih.gov/41230431/ ↩ ↩² ↩³ ↩⁴ ↩⁵

44. Agostinho M, Borges M, Pereira T, Borges DF, Soares JI. “Are Wearable Sleep-Tracking Devices Reliable Alternatives to Polysomnography? A Systematic Review and Meta-Analysis.” Behav Sleep Med. 2026;24(6):698-710. doi:10.1080/15402002.2026.2673893. PMID: 42175611. https://pubmed.ncbi.nlm.nih.gov/42175611/ ↩ ↩²

45. Svensson T, Madhawa K, Nt H, Chung UI, Svensson AK. “Validity and reliability of the Oura Ring Generation 3 (Gen3) with Oura sleep staging algorithm 2.0 (OSSA 2.0) when compared to multi-night ambulatory polysomnography: A validation study of 96 participants and 421,045 epochs.” Sleep Med. 2024;115:251-263. doi:10.1016/j.sleep.2024.01.020. PMID: 38382312. https://pubmed.ncbi.nlm.nih.gov/38382312/ ↩ ↩² ↩³

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47. Altini M, Kinnunen H. “The Promise of Sleep: A Multi-Sensor Approach for Accurate Sleep Stage Detection Using the Oura Ring.” Sensors (Basel). 2021;21(13):4302. doi:10.3390/s21134302. PMID: 34201861. https://pubmed.ncbi.nlm.nih.gov/34201861/ ↩ ↩²

48. Miller DJ, Sargent C, Roach GD. “A Validation of Six Wearable Devices for Estimating Sleep, Heart Rate and Heart Rate Variability in Healthy Adults.” Sensors (Basel). 2022;22(16):6317. doi:10.3390/s22166317. PMID: 36016077. https://pubmed.ncbi.nlm.nih.gov/36016077/ ↩ ↩²

49. Searles ME, Licata A, Cucinotta M, Kainec K, Spencer RMC. “Performance evaluation of consumer sleep-tracking wearables and nearables in healthy young and older adults.” Sleep Adv. 2026;7(1):zpag006. doi:10.1093/sleepadvances/zpag006. PMID: 41768372. https://pubmed.ncbi.nlm.nih.gov/41768372/ ↩ ↩² ↩³

50. Kinnunen H, Rantanen A, Kenttä T, Koskimäki H. “Feasible assessment of recovery and cardiovascular health: accuracy of nocturnal HR and HRV assessed via ring PPG in comparison to medical grade ECG.” Physiol Meas. 2020;41(4):04NT01. doi:10.1088/1361-6579/ab840a. PMID: 32217820. https://pubmed.ncbi.nlm.nih.gov/32217820/ ↩ ↩² ↩³ ↩⁴

51. Cao R, Azimi I, Sarhaddi F, Niela-Vilen H, Axelin A, Liljeberg P, Rahmani AM. “Accuracy Assessment of Oura Ring Nocturnal Heart Rate and Heart Rate Variability in Comparison With Electrocardiography in Time and Frequency Domains: Comprehensive Analysis.” J Med Internet Res. 2022;24(1):e27487. doi:10.2196/27487. PMID: 35040799. https://pubmed.ncbi.nlm.nih.gov/35040799/ ↩ ↩²

52. Liang T, Yilmaz G, Soon CS. “Deriving Accurate Nocturnal Heart Rate, rMSSD and Frequency HRV from the Oura Ring.” Sensors (Basel). 2024;24(23):7475. doi:10.3390/s24237475. PMID: 39686012. https://pubmed.ncbi.nlm.nih.gov/39686012/ ↩ ↩² ↩³

53. Gielen J, Van Oost CN, Debard G, Sels R, De Witte NAJ, Colman T, et al. “Accuracy of Optical Heart Rate Measurements for 10 Commercial Wearables in Different Climate Conditions and Activities: Instrument Validation Study.” JMIR Form Res. 2026;10:e85186. doi:10.2196/85186. PMID: 41701929. https://pubmed.ncbi.nlm.nih.gov/41701929/ ↩ ↩² ↩³

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55. Shanmugam A, Gupta K, Dhawale N, Singhal V, Kumar M, Srinivasan B, Narasimhan V. “Wearable-derived cardiovascular fitness age and its lifestyle correlates in 442 adults.” Front Digit Health. 2026;8:1842633. doi:10.3389/fdgth.2026.1842633. PMID: 42483428. https://pubmed.ncbi.nlm.nih.gov/42483428/ ↩ ↩² ↩³ ↩⁴

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58. Jouvencel A, Willoughby AR, Leong RLF, Chee MWL. “Distal skin temperature stabilization is tightly coupled with sleep onset across structured and free-living conditions.” Sleep Med. 2026;146:109074. doi:10.1016/j.sleep.2026.109074. PMID: 42330816. https://pubmed.ncbi.nlm.nih.gov/42330816/ ↩ ↩²

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66. Gell LK, Mehta K, Esmaeili N, Taranto-Montemurro L, Sands SA, Pittman SD, Azarbarzin A. “Performance evaluation of a ring-worn pulse oximeter for the identification and monitoring of obstructive sleep apnea.” Front Sleep. 2025;4:1549272. doi:10.3389/frsle.2025.1549272. PMID: 41425204. https://pubmed.ncbi.nlm.nih.gov/41425204/ ↩ ↩²

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68. Ben Schoon. Galaxy Ring 2 release-date report. 9to5Google, May 6, 2026 — citing ETNews, “it’s ‘virtually impossible’ for Samsung to release a Galaxy Ring sequel this year”; “likely to launch in early 2027”. A report, not a Samsung announcement. Accessed November 3, 2026. https://9to5google.com/2026/05/06/samsung-galaxy-ring-2-upgrade-release-date-report/ ↩

69. O’Grady B, Lambe R, Baldwin M, Acheson T, Doherty C. “The Validity of Apple Watch Series 9 and Ultra 2 for Serial Measurements of Heart Rate Variability and Resting Heart Rate.” Sensors (Basel). 2024;24(19):6220. doi:10.3390/s24196220. PMID: 39409260. https://pubmed.ncbi.nlm.nih.gov/39409260/ ↩

70. Oura. “ŌURA Reaches Six Million Paid Members.” Oura blog, October 22, 2026. Accessed November 3, 2026. https://ouraring.com/blog/oura-reaches-six-million-paid-members/ ↩

71. Origami, Incorporated. “SensAI: Workout Planner.” Apple App Store listing (id6738963099) — “Get full access free for 7 days. No subscription required to start.”; “Requires iOS 26 or later; Apple Watch requires watchOS 26 or later.”; In-App Purchases “SensAI Premium Monthly $6.99”, “SensAI Premium Yearly $69.99”; 4.6 average from 39 US ratings. Accessed November 3, 2026. https://apps.apple.com/us/app/sensai-workout-planner/id6738963099 ↩ ↩² ↩³ ↩⁴