Best WHOOP Alternatives (2026): Price, Accuracy, No Subscription

WHOOP has no screen and no GPS, and it charges a membership: WHOOP One is $199 a year, Peak $239 and Life $359. Monthly billing is “no longer available as a standard signup option”.¹²

In 2026, four kinds of product compete with it. There are screenless bands you buy once: Garmin Cirqa (launched 21 July 2026), Polar Loop, Fitbit Air and Amazfit Helio Strap.³⁴⁵⁶ There are rings. There are watches that now ship their own recovery score, led by Apple Watch Series 12 and its Readiness score, announced 9 September 2026.⁷ And there are recovery apps for an Apple Watch you already own.

We make SensAI, an AI coaching app that reads Apple Health. It is not a WHOOP replacement and isn’t ranked below. It appears where it is relevant: what each device shares with a coaching app. Every price below was checked on the maker’s US page on 6 October 2026.

What is the best WHOOP alternative in 2026?

The best WHOOP alternative with no subscription is Garmin Cirqa ($199.99), a screen-free band with Training Readiness and Body Battery. Polar Loop costs the same. Fitbit Air ($99.99, free Readiness) and Amazfit Helio Strap ($99.99) are cheapest. Oura Ring 5 ($399 + $69.99/yr) comes from the brand with the most sleep evidence. Apple Watch Series 12 ($399) has built-in Readiness.^3456897

Pick	Best for	Price (Oct 2026)	Subscription	Recovery score name
Garmin Cirqa	WHOOP’s form without the fee	$199.993	None required	Training Readiness, Body Battery
Polar Loop	Polar’s sleep-led recovery	$199.994	None	Nightly Recharge
Fitbit Air	Lowest price with a free Readiness score	$99.995	Optional (Google Health Premium)	Readiness
Amazfit Helio Strap	Budget band for gym and HYROX	$99.996	None required	BioCharge
Oura Ring 5	Sleep tracking (most evidence, on older Oura rings)	From $399 + $5.99/mo or $69.99/yr89	Membership for full app	Readiness
Ultrahuman Ring PRO	A ring with no fees in the US	$47910	None	Dynamic Recovery
RingConn Gen 2 Air	Cheapest ring	$199 list11	None	—
Samsung Galaxy Ring	Samsung Galaxy phone owners only	From $299.9912	None	Energy Score
Apple Watch Series 12	A screen plus built-in recovery	From $3997	None	Readiness (0–10)
Garmin Forerunner 70	Runners who need built-in GPS	$249.9913	None	Training Readiness
Apple Watch SE 3 + Athlytic or Bevel	An app on a cheaper Apple Watch	$249 + $29.99/yr (Athlytic1415)	App subscription	Recovery

US prices from each maker’s store or press release, 6 October 2026, before tax. ”—” means the maker does not name the score on the pages we checked.

Two of these picks come with a caveat you won’t see in most roundups. Amazfit’s US store listed the Helio Strap at $99.99 but showed it sold out on the day we checked.⁶ Galaxy Ring needs a Samsung Galaxy phone, so it is no option at all on iPhone.¹²

If you are choosing between the four biggest platforms rather than replacing WHOOP specifically, see our Apple Watch vs Oura vs WHOOP vs Garmin comparison.

How do WHOOP alternatives compare on price, battery and recovery score?

Of the screenless bands, only WHOOP requires a membership. Garmin Cirqa, Polar Loop, Fitbit Air and Amazfit Helio Strap are bought once. Battery runs from up to 18 hours (Apple Watch SE 3) and 24 hours (Series 12) to 14+ days (WHOOP 5.0) and up to 15 days (Ultrahuman Ring PRO). Every brand names its recovery score differently.^134567141610

Product	Form factor	Price (US, Oct 2026)	Subscription required?	Recovery score name	HRV tracked?	Battery	Phones	Shares HRV with Apple Health?	Peer-reviewed validation
WHOOP 5.0 / MG	Screenless band	$0 upfront; hardware included1	Yes: One $199/yr, Peak $239/yr, Life $359/yr1	Recovery (plus Strain17)	Yes	14+ days16	—	No18	WHOOP 4.0 and 3.0 only; 5.0 untested
Garmin Cirqa	Screenless band, wrist or arm3	$199.993	No (Connect+ optional, $69.99/yr19)	Training Readiness, Body Battery3	Yes (HRV status3)	Up to 10 days3	iPhone or Android3	No18	None
Polar Loop	Screenless band	$199.994	No4	Nightly Recharge4	Yes (nightly4)	Up to 8 days4	—	No18	None
Fitbit Air	Screenless band, 12 g with band20	$99.995	No (Premium optional, $99/yr; 3 months included21)	Readiness5	Yes5	Up to 7 days20	Android 11+, iOS 16.4+20	No18	None
Amazfit Helio Strap	Screenless, wrist or upper arm6	$99.996	No6	BioCharge6	Yes (sleep HRV6)	Up to 10 days6	iPhone and Android6	—	None
Oura Ring 5	Ring	From $3998	Membership $5.99/mo or $69.99/yr; without it, only three daily scores9	Readiness9	Yes	6–9 days22	—	No18	Ring 5 untested; Gen 4 and Gen 3 validated
Ultrahuman Ring PRO	Ring	$47910	No10	Dynamic Recovery23	Yes23	Up to 15 days10	—	—	None independent
RingConn Gen 2 Air	Ring	$199 list11	No11	—	Yes11	Up to 10 days11	—	—	None
Samsung Galaxy Ring	Ring	$399.99 list; from $299.99 on samsung.com2412	No25	Energy Score12	—	Up to 7 days12	Samsung Galaxy only12	n/a (no iPhone)	None
Apple Watch Series 12	Watch	From $3997	No	Readiness (0–107)	Yes7	Up to 24 hours7	iPhone	Yes18	Series 12 untested; Series 9 and Ultra 2 tested
Garmin Forerunner 70	Watch with built-in GPS13	$249.9913	No	Training Readiness13	Yes (HRV status13)	Up to 13 days13	—	No18	None for Forerunner 70
Apple Watch SE 3 + Athlytic	Watch + app	$249 + $29.99/yr1415	Athlytic Pro	Recovery (Athlytic15)	Yes14	Up to 18 hours14	iPhone	Yes (Apple Watch18)	App not validated

Prices and specs from maker pages and press releases, 6 October 2026. ”—” means the maker’s pages or the SensAI Help Center guide do not cover it. “Untested” means we found no peer-reviewed validation against ECG or polysomnography for that model.

One ring is missing on purpose. Ultrahuman’s Ring AIR is not sold in the US. An International Trade Commission exclusion order in Oura’s patent case took effect on 21 October 2025.²⁶ US Customs cleared the redesigned Ring PRO in March 2026, and Oura called that “not a final or comprehensive ruling”.²⁷ Ultrahuman’s US Ring AIR page now returns “page not found”, and its US buy page leads to the PRO.¹⁰

Is WHOOP worth it, or is a one-time tracker cheaper?

Over three years, WHOOP One costs $597, Peak $717 and Life $1,077. Garmin Cirqa and Polar Loop cost $199.99 once, Fitbit Air and Helio Strap $99.99, and Apple Watch Series 12 $399 with nothing recurring. Oura Ring 5 comes to about $609, within $12 of WHOOP One. WHOOP is worth it only if you use what the membership pays for.^13456789

Think of WHOOP as a lease and the others as a purchase. The lease costs nothing upfront and never ends. The purchase hurts once and then stops.

What does each WHOOP alternative cost over three years?

Option	Upfront	Required recurring	3-year total
Fitbit Air	$99.995	None (Premium optional, $99/yr after 3 included months21)	$99.99 (about $397 with Premium28)
Amazfit Helio Strap	$99.996	None	$99.99
RingConn Gen 2 Air	$19911	None	$199
Garmin Cirqa	$199.993	None (Connect+ optional, $69.99/yr19)	$199.99
Polar Loop	$199.994	None	$199.99
Garmin Forerunner 70	$249.9913	None	$249.99
Apple Watch SE 3 + Athlytic	$24914	$29.99/yr15	about $339
Samsung Galaxy Ring (Galaxy phones only)	$299.99–$399.991224	None	$300–$400
Apple Watch Series 12	$3997	None	$399
Ultrahuman Ring PRO	$47910	None	$479
WHOOP One	$0	$199/yr1	$597
Oura Ring 5	$3998	$69.99/yr (first month included9)	about $609
WHOOP Peak	$0	$239/yr1	$717
WHOOP Life	$0	$359/yr1	$1,077

Computed from US list prices on 6 October 2026, before tax. Optional subscriptions are excluded unless marked. Sale prices are ignored.

The pattern is simple. A $199.99 band costs about what one year of WHOOP One costs, and nothing after that. A $99.99 band costs about half a year.

Is WHOOP more cost-effective than Oura?

Over three years, WHOOP One ($597) and Oura Ring 5 (about $609) cost almost the same. From year four, Oura is cheaper per year: $69.99 for the membership versus $199 for WHOOP One. The difference is timing. Oura asks for $399 upfront, while WHOOP asks for nothing upfront and bills you every year.¹⁸⁹

Oura without a membership is a thinner product than its price suggests. Without it, “you’ll only be able to see your three daily Oura scores (Readiness, Activity, and Sleep)”, plus battery and basic settings.⁹ Budget for the membership if you buy the ring.

What does the WHOOP membership actually pay for?

WHOOP One ($199/yr) includes Strain and Sleep tracking, recovery insights, Strength Trainer, VO2 Max, an AI Coach, Journal and Trends. Peak ($239) adds Health Monitor, Stress Monitor and Healthspan, with WHOOP Age and Pace of Aging. Life ($359) adds Blood Pressure Insights and Heart Screener (ECG and irregular rhythm notifications) on the 5.0 Medical Grade sensor.¹

Monthly plans exist on paper at $25, $30 and $40 a month. WHOOP’s own pricing page says they are “no longer available as a standard signup option but remain accessible in select renewal scenarios”.¹

So here is a fair test. WHOOP is worth it if you would actually use Healthspan, ECG or blood pressure insights, or if you want to pay nothing upfront. If you mainly look at sleep and a morning recovery number, a one-time band covers that, and a $199.99 band costs about the same as your first year of WHOOP One.

Which WHOOP alternatives have no subscription?

Garmin Cirqa, Polar Loop, Fitbit Air, Amazfit Helio Strap, Ultrahuman Ring PRO, RingConn, Galaxy Ring, Apple Watch and Garmin Forerunner 70 all work without a required subscription. The optional tiers covered below are Garmin Connect+, Google Health Premium and Oura’s membership. Oura’s membership is the only one of those that locks core features.^34561011259

What the optional tiers add:

• Garmin Connect+ costs $6.99 a month or $69.99 a year. Garmin’s announcement says “All existing features and data in Garmin Connect will remain free.”¹⁹
• Google Health Premium costs $9.99 a month or $99 a year, and every Fitbit Air comes with 3 months of it.²¹ Without it, Fitbit Air’s free Base tier still includes Readiness, Sleep Score, sleep stages, heart rate variability, breathing rate and SpO2.⁵ Premium adds the Gemini-based Google Health Coach.
• Oura membership costs $5.99 a month or $69.99 a year, and the first month comes with the ring.⁹ It is optional in name only: without it you see three scores and little else.

The rest say no subscription is needed. Ultrahuman says “there are no recurring subscription fees for accessing your data”.¹⁰ Samsung says Galaxy Ring data sits in Samsung Health “without a subscription”.²⁵ Amazfit says the Helio Strap works with the Zepp app with “no required monthly subscription”.⁶

How does WHOOP compare to alternatives for recovery scoring?

Every rival has its own recovery score: Garmin’s Training Readiness and Body Battery, Oura’s Readiness, Polar’s Nightly Recharge, Samsung’s Energy Score, Ultrahuman’s Dynamic Recovery and Apple’s Readiness. A 2025 review of 14 such scores from 10 brands found none disclosed its formula. HRV fed 86% of them and resting heart rate 79%. They are not interchangeable.¹⁷⁷

Think of each recovery score as a currency the brand prints itself. A WHOOP 70 can’t be exchanged for an Oura 70, because nobody publishes the exchange rate.

Product	Score name	Formula published?
WHOOP	Recovery (plus Strain and Stress Monitor)	No17
Garmin Cirqa, Forerunner 70	Training Readiness, Body Battery	No17
Polar Loop	Nightly Recharge	No17
Fitbit Air	Readiness	No17
Oura	Readiness (plus Resilience)	No17
Samsung Galaxy Ring	Energy Score	No17
Ultrahuman	Dynamic Recovery	No17
Amazfit Helio Strap	BioCharge	Not in the 2025 review
Apple Watch Series 12, Ultra 4	Readiness (0–10)	Not in the 2025 review (launched after it)
Athlytic, Bevel	Recovery, Recovery Score	Not in the 2025 review

That review was led by Cailbhe Doherty, PhD, an associate professor in the School of Public Health, Physiotherapy and Sports Science at University College Dublin. His team catalogued the scores from public company documentation. “None of the manufacturers disclosed their exact algorithmic formulas,” they wrote. The most common inputs were HRV (86%), resting heart rate (79%), physical activity (71%) and sleep duration (71%).¹⁷

Doherty put it more plainly for a general audience: “Most companies don’t disclose how exactly they turn raw data into a final score.”²⁹

Eric Topol, MD, a cardiologist and the founder and director of the Scripps Research Translational Institute, made the same point in September 2026. “Since none of these are standardized, they are not interchangeable, so if you get a 90 for Oura that has no relationship to a 90 on a Google Fitbit Air,” he wrote. He added: “Notably, the company can update its algorithm for readiness score at any point without notification to device users.”³⁰

Marco Altini, PhD, co-founder of HRV4Training and a co-author of the 2025 review, goes further. He is also an advisor to Oura, so weigh that accordingly.³¹ His advice: “if you want to use a wearable, at least use it to look at the physiology, and ignore made-up metrics (recovery, readiness, etc.)”³²

What this means if you leave WHOOP: you are not porting your Recovery number. You are starting a new baseline on a new scale. Give any new device a few weeks before you trust its verdicts. For how the big three are built, see how Body Battery, WHOOP Recovery and Oura Readiness are calculated.

Which WHOOP alternative is most accurate for HRV and heart rate?

In a 2025 study against ECG across 536 nights, overnight HRV agreement (Lin’s concordance) was 0.99 for Oura Gen 4, 0.97 for Oura Gen 3, 0.94 for WHOOP 4.0, 0.87 for Garmin Fenix 6 and 0.82 for Polar Grit X Pro. WHOOP 5.0, Garmin Cirqa, Polar Loop, Fitbit Air and Apple Watch Series 12 have no published validation yet.³³

Device (tested generation)	HRV agreement (CCC)	HRV error (MAPE)	Resting HR agreement (CCC)
Oura Gen 4	0.99	5.96%	0.98
Oura Gen 3	0.97	7.15%	0.97
WHOOP 4.0	0.94	8.17%	0.91
Garmin Fenix 6	0.87	10.52%	Excluded
Polar Grit X Pro	0.82	16.32%	0.86

Dial et al., Physiological Reports, 2025: 13 adults, 536 nights, against an ECG reference. Garmin was excluded from the resting heart rate analysis “due to methodological inconsistencies”. The authors declared no competing interests. CCC runs from 0 to 1, where 1.0 is perfect agreement with ECG; MAPE is the average error as a percentage.³³

Read that table for what it is: a test of older hardware. The WHOOP result is for the 4.0, not the 5.0 you would buy today.

Other studies fill in the picture:

• WHOOP 4.0 and earlier: a 2021 ECG study found WHOOP’s heart rate bias was at most 0.39%. Its HRV error “approached or exceeded” the smallest change worth acting on. One author’s position was sponsored by WHOOP, an arrangement that began after the data were collected.³⁴ A 2025 study found WHOOP 4.0 acceptable at steady state but “less accurate during transitions”, when heart rate changes fast.³⁵
• Apple Watch: Series 9 and Ultra 2 underestimated HRV by an average of 8.31 ms against a Polar H10 chest strap, with a 28.88% error. Resting heart rate was much closer, at 5.91%.³⁶
• Oura: a 2020 study of 49 adults found nightly HRV agreement of r² = 0.980 against ECG. The authors were affiliated with Oura Health.³⁷

The bigger problem is how little gets tested at all. Doherty’s 2024 umbrella review found that “approximately 11%” of consumer wearables released to date had been validated for even one biometric outcome. The studies that exist are “just 3.5%” of what a full evaluation would need.³⁸

Topol’s summary: “Only resting heart rate has been shown consistently across devices to be extremely accurate.”³⁰

So if HRV accuracy is why you bought WHOOP, a ring has the strongest published evidence, from Oura’s Gen 3 and Gen 4. Every new 2026 band is a bet on untested hardware. Our wearable HRV accuracy guide covers the studies in more depth.

Which WHOOP alternative tracks sleep most accurately?

Against lab polysomnography in 2025, sleep-stage agreement (Cohen’s kappa) was 0.53 for Apple Watch Series 8, 0.41–0.42 for Fitbit and 0.37 for WHOOP 4.0, which overestimated total sleep by about 24 minutes. Every device detected over 90% of sleep but staged it poorly. Oura has the largest evidence base, including a 2025 meta-analysis.³⁹⁴⁰

Device (tested generation)	Sleep-stage agreement (κ)	Note
Apple Watch Series 8	0.53	Highest in the study
Fitbit Sense	0.42
Fitbit Charge 5	0.41
WHOOP 4.0	0.37	Total sleep 434 vs 410 min on PSG (+24.46 min)
Withings ScanWatch	0.22
Garmin Vivosmart 4	0.21

Schyvens et al., Sleep Advances, 2025: 62 adults, one night each in a sleep lab with polysomnography (PSG).³⁹

A kappa of 0.37 to 0.53 is “fair to moderate” agreement. In plain terms, these devices are good at telling asleep from awake and much weaker at telling deep sleep from light sleep.

An earlier six-device study points the same way. In a 2022 lab study of 53 adults, sleep-stage kappa was 0.20 for Apple Watch Series 6, 0.25 for Garmin Forerunner 245, 0.28 for Polar Vantage V, 0.43 for Oura Gen 2 and 0.44 for WHOOP 3.0. The authors concluded that “all six devices require improvement for the assessment of specific sleep stages”. Their lab receives research support from WHOOP.⁴¹

A 2020 study from the same group compared WHOOP with polysomnography over 86 nights. Four-stage kappa was 0.47, and WHOOP overestimated total sleep by 8.2 minutes, a non-significant difference. Researchers entered the bedtimes by hand, which a normal user does not do.⁴²

Two more findings explain why stage minutes wobble. A 2021 study of seven consumer devices found sensitivity to sleep of at least 0.93 but specificity for wake of only 0.18–0.54, and devices did worse on disrupted nights.⁴³ And Doherty’s umbrella review found wearables typically overestimate total sleep time, with errors usually above 10%.³⁸

Oura’s evidence base is the largest. A 2025 meta-analysis pooled 6 studies with 388 participants and found no statistically significant difference from PSG or actigraphy for total sleep time (mean difference −2.97 minutes).⁴⁰

The practical rule: trust total sleep and your sleep timing more than the minutes in each stage.

How does WHOOP compare to alternatives for longevity features?

WHOOP has the deepest longevity stack of any band. Peak ($239/yr) adds Healthspan, with WHOOP Age and Pace of Aging. Life ($359/yr) adds ECG and Blood Pressure Insights. Advanced Labs blood panels cost $199–$899 a year on top. Oura adds Health Radar for members with Gen3 rings and newer. The no-subscription bands offer none of this.¹⁴⁴²²

What each option offers:

• WHOOP Advanced Labs is an add-on subscription with 75+ biomarkers per test: Basic $199 (1 test a year), Standard $349 (2), Expanded $599 (4) and Comprehensive $899 (6). Tests run through Quest in the US, and are not currently available in Hawaii, North Dakota, South Dakota, Wyoming or Arizona.⁴⁴
• WHOOP Blood Pressure Insights has a regulatory history. The FDA sent WHOOP a warning letter over the feature in July 2025. In June 2026 it lifted the letter after WHOOP modified the feature.⁴⁵
• Oura Ring 5 launched with Health Radar, AI-enabled medical guidance from Counsel Health and GLP-1 Insights, for members with Gen3 rings and newer.²²
• Apple Watch Series 12 and Ultra 4 have hypertension notifications and the ECG app with no subscription. The SE 3 has neither.¹⁴
• Athlytic and Bevel offer app-level age estimates (“Athlytic Age” and “Biological Age”). Bevel says it calculates biological age from markers like sleep, activity and resting heart rate.¹⁵⁴⁶

Treat every age number on this list as an estimate. Topol’s verdict on readiness-style composite scores, that they are proprietary and unvalidated against health outcomes, is a fair default for these figures too.³⁰

Is WHOOP better than the alternatives for serious athletes?

Not if you need GPS or a screen: WHOOP has neither. Its edge for athletes is the daily Strain score tied to Recovery. The Garmin Forerunner 70 ($249.99) adds built-in GPS, Training Readiness and wrist-based running power with no subscription. Cirqa borrows your phone’s GPS. HRV-guided training itself shows only small performance gains.²¹³³⁴⁷

Here is what each option gives an athlete:

• WHOOP: “While you can track distance within the WHOOP app, the sensor itself does not have a built-in GPS.” It has no watch face by design.² Strength Trainer and HR zones are included in WHOOP One.¹
• Garmin Forerunner 70: built-in GPS, “training readiness, training status, wrist-based running power”, HRV status and up to 13 days of battery in smartwatch mode.¹³
• Garmin Cirqa: connects to a “compatible iPhone or Android smartphone’s GPS”. It adds recovery time, training status and VO2 max.³
• Polar Loop: no GPS in the band. Ray Maker, the product reviewer behind DC Rainmaker, struggled with its automatic workout detection: “I have yet to capture a single workout correctly.” His verdict on the WHOOP comparison: “Just because it’s positioned as a competitor, doesn’t make it a true replacement.”⁴⁸
• Amazfit Helio Strap: live heart-rate broadcast to gym equipment, bike computers and watches, plus a HYROX Race Mode.⁶

Then there is the question under the question: does training by HRV make you faster? A 2021 meta-analysis found HRV-guided training improved vagal HRV more than a fixed plan (standardized mean difference 0.50, a moderate effect). Its effects on VO2max and endurance performance were small (0.20 each) and not statistically significant. If HRV guidance is superior, the authors wrote, “it is only by a small margin.”⁴⁷

Accuracy also matters more in hard sessions. WHOOP 4.0 was “less accurate during transitions”, the rapid heart-rate swings that define interval work.³⁵

For a serious athlete, the deciding features are GPS, a screen for pacing and chest-strap compatibility. The recovery number decides less than the marketing suggests.

Can an Apple Watch track recovery like WHOOP?

Yes, on the newest models. Apple Watch Series 12 and Ultra 4 have a built-in Readiness app with a 0–10 score and four recommendations: Recover, Pace Yourself, Ready or Go For It. The SE 3 and older watches don’t, so they need an app such as Athlytic ($29.99/yr), Bevel ($99.99/yr) or Gentler Streak ($8.99/mo or $39.99/yr).^714154649

Apple announced Series 12 on 9 September 2026, with availability from 18 September. HRV “is now measured up to 24 times more often”. Battery life is still “up to 24 hours”, which is the honest trade-off against WHOOP’s 14+ days.⁷¹⁶

The SE 3 costs $249. Apple’s comparison page lists its Readiness app as “Not available”, and its Vitals app leaves out HRV.¹⁴

App	Price (US)	US App Store rating	Scores
Athlytic	Free; Pro $4.99/mo or $29.99/yr	4.79 from 11,078 ratings	Recovery, Exertion, Athlytic Age15
Bevel	Free; Pro $14.99/mo or $99.99/yr	4.85 from 16,828 ratings	Recovery Score, Strain Score, Sleep Score, Biological Age46
Gentler Streak	Free; Premium $8.99/mo or $39.99/yr	4.71 from 8,824 ratings	Vitals and sleep summary, workout suggestions based on readiness49

US App Store listings and ratings, 6 October 2026.

Athlytic reads “your overnight HRV and resting heart rate against your own baseline”. On Series 12 and Ultra 4, it says, “Recovery uses Apple’s new Recovery HRV.”¹⁵

Apple Watch also has one advantage over WHOOP, Garmin, Oura, Polar and Fitbit: it writes HRV to Apple Health, and they do not. That makes it the only one of them whose HRV reaches coaching apps that read Apple Health, SensAI included.¹⁸

Which WHOOP alternative should you buy?

Buy Garmin Cirqa if you want WHOOP’s form without the fee. Buy Fitbit Air or Amazfit Helio Strap if price matters most. Buy Oura Ring 5 for sleep evidence. Buy Apple Watch Series 12 if you’d rather have a screen. Buy a Garmin Forerunner 70 if you need GPS. Or add Athlytic or Bevel to your Apple Watch.^356871315

Garmin Cirqa: best WHOOP alternative without a subscription

Best for: WHOOP users who want the same screen-free band and a familiar recovery score, without a membership.

Garmin launched Cirqa on 21 July 2026 as its “first screen-free smart band”, at $199.99 with “no subscription required”. It can be worn “around the wrist or as an arm band”.³

It tracks Training Readiness, Body Battery, HRV status, sleep score and stages, skin temperature and Pulse Ox, with up to 10 days of battery. It uses your phone’s GPS for outdoor workouts.³ Garmin Connect+ is optional.¹⁹

The weakness: it is brand-new, and we found no published validation of it. Garmin’s older Fenix 6 scored 0.87 for HRV agreement in the 2025 ECG study, behind WHOOP 4.0 and Oura.³³

Polar Loop: best for Polar’s Nightly Recharge

Best for: sleep-first users who want Polar’s recovery model and an 8-day battery.

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

The weakness is training. The band has no GPS of its own, and automatic workout detection failed Ray Maker’s testing at launch.⁴⁸ Its HRV has no published validation. The Polar watch in the 2025 ECG study, the Grit X Pro, had the lowest HRV agreement of the five devices tested.³³

Fitbit Air: cheapest WHOOP alternative with a free Readiness score

Best for: the lowest price, with a Readiness score you don’t pay for.

Fitbit Air costs $99.99 on the Google Store. Google announced it at $99, or $129 for the Special Edition.⁵²¹ It weighs 12 g with the band and lasts up to 7 days.²⁰

The free Base tier includes Readiness, Sleep Score, HRV, breathing rate and SpO2.⁵ Google Health Premium is optional, and 3 months are included.²¹ It works with Android 11+ and iOS 16.4+.²⁰

The weakness: Fitbit Air itself has no published validation. Older Fitbits (Sense and Charge 5) scored 0.41–0.42 for sleep staging in 2025.³⁹

Amazfit Helio Strap: best budget band for gym and HYROX

Best for: gym and HYROX training on a budget, worn on the wrist or upper arm.

Helio Strap is listed at $99.99, with “No required subscription”, up to 10 days of battery, and wear on the wrist or upper arm.⁶ It broadcasts live heart rate to gym equipment and watches, has a HYROX Race Mode, and works with iPhone and Android through the Zepp app.⁶

Its recovery score is BioCharge. At launch, Ray Maker noted it did not calculate a separate “Readiness” score.⁵⁰

The weaknesses: no published validation, and Amazfit’s US store showed it sold out on 6 October 2026.⁶

Oura Ring 5: best for sleep, if you accept a membership

Best for: sleep tracking backed by the most published evidence, in a ring.

Oura Ring 5 starts at $399 and was announced on 28 May 2026. It is “40% smaller than Oura Ring 4” with 6 to 9 days of battery.⁸²² The membership costs $5.99 a month or $69.99 a year, with the first month included.⁹

Oura’s Gen 4 and Gen 3 had the best HRV agreement in the 2025 ECG study, and a 2025 meta-analysis found no significant difference from PSG or actigraphy for total sleep.³³⁴⁰ Ring 5 itself is untested. Oura Ring 4 is still sold from $349.⁸

For how Oura compares with other rings, see Oura vs Galaxy Ring vs Ultrahuman.

Ultrahuman Ring PRO: best ring with no subscription in the US

Best for: a ring with long battery life and no fees, if you’re in the US.

Ring PRO costs $479 in the US, with “no recurring subscription fees”. It lasts up to 15 days, or up to 45 with the PRO charging case.¹⁰ Its recovery score is Dynamic Recovery.²³

Ring AIR is not sold in the US. US Customs cleared the redesigned PRO in March 2026, and Oura has said that decision is not final.²⁷ We found no independent validation of the PRO.

RingConn Gen 2 Air: cheapest ring

Best for: the lowest-cost ring with no subscription.

Gen 2 Air lists at $199, with no subscription fee and up to 10 days of battery.¹¹ RingConn is still sold in the US under a multi-year patent licence from Oura, agreed in October 2025.²⁶

We could not confirm the name of its recovery score on RingConn’s pages, so we have left it out. It has no published validation.

Samsung Galaxy Ring: best for Samsung Galaxy phones only

Best for: Samsung Galaxy phone owners who want a ring.

Galaxy Ring launched at $399.99 and is listed from $299.99 on samsung.com.²⁴¹² It has an Energy Score, up to 7 days of battery and no subscription.¹²²⁵

It needs a Samsung Galaxy phone. Samsung says “a Samsung account must be registered on your Samsung Galaxy smartphone”, and Energy Score needs a compatible Galaxy AI phone.¹² It does not work with iPhone.

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

Best for: iPhone owners who want a recovery score plus a full smartwatch.

Series 12 starts at $399, with a 0–10 Readiness score and up to 24 hours of battery.⁷ Unlike WHOOP, Garmin, Oura, Polar and Fitbit, it shares HRV with Apple Health.¹⁸

The weakness is battery: one day against WHOOP’s 14+.¹⁶ Series 12 is untested. The Series 9 and Ultra 2 underestimated HRV by 8.31 ms in 2024, while the Series 8 led the 2025 sleep-staging study.³⁶³⁹

Garmin Forerunner 70: best for runners who want GPS and Training Readiness

Best for: runners who want built-in GPS and a readiness score without paying a subscription.

Forerunner 70 costs $249.99 and went on sale on 15 May 2026. It has built-in GPS, training readiness, training status, HRV status and wrist-based running power, with up to 13 days of battery in smartwatch mode.¹³

It is a watch, not a band, so it is bigger than WHOOP. We found no published validation for the Forerunner 70.

Athlytic, Bevel or Gentler Streak: best if you already own an Apple Watch

Best for: anyone who already wears an Apple Watch and wants a WHOOP-style recovery score.

Athlytic costs $29.99 a year, Bevel $99.99 a year, and Gentler Streak $8.99 a month or $39.99 a year.¹⁵⁴⁶⁴⁹ See the app table in the Apple Watch section above for ratings and scores. None of the three has published validation of its scores.

Where does WHOOP still beat its alternatives?

WHOOP still wins on four things: no upfront hardware cost, 14+ days of battery, the Strain-to-Recovery coaching loop, and longevity extras (Healthspan, ECG, Blood Pressure Insights, Advanced Labs). Its 4.0 sensor had the best wrist HRV agreement in a 2025 ECG study, at 0.94, beaten only by Oura’s rings. No new 2026 band has published validation.^1164433

• $0 upfront. The hardware comes with the membership.¹
• 14+ days of battery on WHOOP 5.0, by WHOOP’s figure.¹⁶
• AI Coach and Strength Trainer are included in WHOOP One.¹
• Health features: Healthspan on Peak, ECG and Blood Pressure Insights on Life.¹
• Advanced Labs blood testing, from $199 a year.⁴⁴
• A validation record few rivals match: Miller 2020, Bellenger 2021, Miller 2022 and Dial 2025.^42344133 The first three came from a lab that receives WHOOP support. The Dial authors declared no competing interests.

The caveat matters: all of that evidence is for WHOOP 4.0 and 3.0, not the 5.0 sold today.

Which WHOOP alternative works best with iPhone and Apple Health?

On iPhone, Apple Watch writes HRV to Apple Health. WHOOP, Garmin, Oura, Polar and Fitbit write sleep, heart rate and workouts, but no HRV. No brand’s recovery score crosses at all: Recovery, Body Battery and Readiness all stay behind. So any app that reads Apple Health sees your raw data, never your vendor’s score.¹⁸

Device app	What it writes to Apple Health	HRV?	Score that stays behind
Apple Watch	Workouts, heart rate, HRV, sleep, VO2 Max	Yes	—
WHOOP	Sleep, resting heart rate, respiratory rate, blood oxygen, workouts, workout calories	No (WHOOP uses rMSSD; Apple Health stores SDNN)	Recovery, Strain
Garmin Connect (Garmin watches and Cirqa)	Workouts, heart rate, sleep, steps, calories; one-way	No	Body Battery, Training Readiness
Oura	Sleep with stages, heart rate (1-minute), active energy, steps, respiratory rate, workouts	No (no resting heart rate either)	Readiness
Polar Flow (Loop)	Workouts with average and workout heart rate, active energy, sleep, steps, weight	No (no continuous heart rate)	Nightly Recharge
Google Health (Fitbit Air), app v5.05+, since August 2026	Exercise, sleep, vitals, steps (two-way)	No	Readiness

Source: the SensAI Help Center guide, last updated 25 September 2026, which cites a source for each device.¹⁸ Cirqa’s data goes to the Garmin Connect app.³ Ultrahuman, RingConn and Amazfit are not covered by our Help Center guide, so we don’t list what they write.

For the full 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. There is no WHOOP, Garmin or Oura account to link inside it.¹⁸

Whichever device you pick, its sleep and heart rate still count. 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.”¹⁸ Workouts from your device sit next to your planned strength sessions, and when one matches a session Coach had planned, tapping Link marks that session complete.¹⁸

HRV is different. It reaches SensAI only from Apple Watch. WHOOP’s Recovery and Strain never arrive, and neither do Garmin’s or Oura’s scores.¹⁸

So a WHOOP user who starts using SensAI keeps sleep, resting heart rate and workouts. They do not keep HRV or the Recovery score. SensAI’s HRV tile reads “No recent value” unless an Apple Watch provides it.¹⁸

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

Where SensAI falls short

• It is not a wearable. You still need one of the devices above.
• iPhone and Apple Watch only. It requires iOS 26 and watchOS 26, and there is no Android version.⁵¹
• HRV only from Apple Watch. If you leave WHOOP for Oura or Garmin, SensAI gets no HRV at all.¹⁸
• Your score history stays behind. Vendor scores never transfer, so your WHOOP or Oura history does not come with you.¹⁸
• Limited history import. SensAI syncs roughly the last 30 days of Apple Health workouts.¹⁸
• It is a subscription. The App Store listing says “Try free for 7 days. No subscription required to start.” After that it costs $6.99 a month or $69.99 a year.⁵¹
• Few ratings so far. SensAI has 36 US App Store ratings. Athlytic and Bevel each have more than 11,000.⁵¹¹⁵⁴⁶

Frequently asked questions

What is the closest thing to WHOOP without a subscription?

Garmin Cirqa is the closest match. It is a screen-free band worn on the wrist or arm, with Training Readiness and Body Battery, for $199.99 and no subscription.³

Is there a Garmin watch like WHOOP?

Garmin’s closest WHOOP equivalent is Cirqa, which is a band rather than a watch.³ If you want a Garmin watch, the Forerunner 70 has Training Readiness and HRV status for $249.99.¹³

What is the cheapest WHOOP alternative?

Fitbit Air and Amazfit Helio Strap, at $99.99 each with no required subscription. Three years of WHOOP One costs $597.⁵⁶¹

Does Oura need a subscription like WHOOP?

Not to work, but you’ll want one. The membership costs $5.99 a month or $69.99 a year, and without it you see only your three daily scores: Readiness, Activity and Sleep.⁹

Can you wear a WHOOP alternative on your arm?

Yes. Garmin Cirqa can be worn “around the wrist or as an arm band”, and Amazfit Helio Strap can be worn on the wrist or upper arm.³⁶

Does WHOOP share HRV with Apple Health?

No. WHOOP calculates HRV as rMSSD, while Apple Health stores SDNN, so WHOOP does not write HRV to Apple Health. Of the devices our Help Center guide covers, only Apple Watch shares HRV with Apple Health.¹⁸

Is the Ultrahuman Ring AIR sold in the US?

No. An ITC exclusion order took effect on 21 October 2025, and Ultrahuman’s US store now sells the redesigned Ring PRO at $479 instead.²⁶¹⁰

Is Apple making a WHOOP competitor?

Reported, not announced. Bloomberg reported in September 2026 that Apple is exploring “a thin fabric band with a sensor-equipped computing module”, which would not be released until at least 2028.⁵²

Should you cancel WHOOP for an alternative?

Cancel if you mainly use WHOOP for sleep and a daily recovery number. A $99.99–$199.99 band or an Apple Watch Series 12 does that with no membership, and a $199.99 band costs about the same as one year of WHOOP One. Stay if you use Strain coaching, Healthspan, ECG or blood panels, or you want no upfront cost.¹⁵³⁷

Whichever you choose, treat the morning score as a starting point rather than an instruction. Doherty’s advice holds for every device on this page: “Use your fitness tracker as a guide, but not as your coach, your doctor, or your judge.”²⁹

And if you want a coach that reads the raw data your device writes to Apple Health, that is what SensAI does, on iPhone and Apple Watch.

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References

Footnotes

1. WHOOP. “Membership Pricing.” WHOOP Support, 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, adds “Health Monitor, Stress Monitor, Healthspan (WHOOP Age & Pace of Aging)”; WHOOP Life $359, “5.0 Medical Grade Sensor”, adds “Blood Pressure Insights, Heart Screener (ECG & Irregular Heart Rhythm Notifications), and priority phone support”; One features “Core fitness and recovery insights, Strain & Sleep tracking, Strength Trainer, VO2 Max, AI Coach, Journal & Behavior Impact, Trends”; monthly “WHOOP One: $25/month, WHOOP Peak: $30/month, WHOOP Life: $40/month”; “Month to Month subscriptions are no longer available as a standard signup option but remain accessible in select renewal scenarios”. Accessed October 6, 2026. https://support.whoop.com/s/article/Membership-Pricing?language=en_US ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹

2. WHOOP. “WHOOP Basics.” WHOOP Support, Aug 13, 2026 — “While you can track distance within the WHOOP app, the sensor itself does not have a built-in GPS”; “WHOOP intentionally does not have a watch face to distract you with notifications.” Accessed October 6, 2026. https://support.whoop.com/s/article/WHOOP-Basics?language=en_US ↩ ↩² ↩³

3. 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”; “up to 10 days of battery life”; “Can be worn around the wrist or as an arm band”; “training readiness”, “HRV status, VO2 max and training status”; “Body Battery energy monitoring, Pulse Ox, stress, skin temperature”; “a sleep score”; “Connect to a compatible iPhone or Android smartphone’s GPS”; data “accessed through the Garmin Connect app”; “suggested retail price of $199.99”; “no subscription required”. Accessed October 6, 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 ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³

4. 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”; “Nightly HRV”. Accessed October 6, 2026. https://www.polar.com/us-en/loop ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴

5. Google Store. “Google Fitbit Air.” US product page — “From $99.99”; “Base: Included with Google Health when paired with Google Fitbit Air: Steps, calories, distance, Cardio load, Readiness; Sleep Score, Sleep schedule, Sleep duration, and Sleep stages; Heart rate, heart rate variability, breathing rate, blood oxygen (SpO2)”; Premium adds “Google Health Coach – your personal health coach, built with Gemini”. Accessed October 6, 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

6. Amazfit. “Helio Strap.” Amazfit US product page — “Regular price $99.99”; “Sold Out” (October 6, 2026); “No required subscription”; “Wrist or upper-arm wear for training”; “Up to 10 days of battery life”; “Live heart-rate broadcast”; “HYROX Race Mode”; “Energy Levels: BioCharge”; “Sleep heart rate variability”; “Helio Strap works with both iPhone and Android devices through the Zepp App”; “no required monthly subscription”. Accessed October 6, 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 ↩²² ↩²³

7. Apple. “Introducing Apple Watch Series 12, with the all-new Health Sensing System.” Apple Newsroom, September 9, 2026 — “Readiness provides a single 0-10 score with a clear, actionable recommendation: Recover, Pace Yourself, Ready, or Go For It”; “HRV, a key indicator of stress and recovery, is now measured up to 24 times more often”; “up to 24 hours of everyday battery life”; “availability in stores beginning Friday, September 18”; “Apple Watch Series 12 starts at $399 (U.S.)”. Accessed October 6, 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 ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶

8. Oura. “Oura Store.” — “Oura Ring 5 From $399”; “Oura Ring 4 From $349”; “Free trial month for new Oura Members”. Accessed October 6, 2026. https://ouraring.com/store ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

9. Oura. “Oura Membership.” Oura Support, last updated October 5, 2026 — “Oura Membership is available for $5.99/month and $69.99/year in the US”; “For new members, your first month of membership comes with your ring purchase”; “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.” Accessed October 6, 2026. https://support.ouraring.com/hc/en-us/articles/4409086524819-Oura-Membership ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

10. Ultrahuman. “Ring PRO — Buy.” US store — “Ring PRO (with PRO charging case) $479”; “Up to 15 days battery life”; “up to 45 days of battery life” with the PRO Charger; “there are no recurring subscription fees for accessing your data”. ultrahuman.com/us/ring-air/buy/ returned “page not found” and ultrahuman.com/ring/buy/us/ redirected to the Ring PRO buy page on October 6, 2026. Accessed October 6, 2026. https://www.ultrahuman.com/us/ring-pro/buy/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

11. RingConn. “RingConn Gen 2 Air.” Product page — “Regular price $199.00 USD”; “Up to 10 days battery life”; comparison table “Subscription Fee: Free”; “Heart Rate Variability (HRV): 24/7 Monitoring”. Accessed October 6, 2026. https://ringconn.com/products/ringconn-gen-2-air ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

12. Samsung. “Galaxy Ring.” Samsung US — “From $299.99 before trade-in”; “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”; battery “Up to 7 Days”. Accessed October 6, 2026. https://www.samsung.com/us/rings/galaxy-ring/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

13. Garmin. “Run further with Forerunner 70 and Forerunner 170 from Garmin.” Press release, May 12, 2026 — “built-in GPS”; “training readiness, training status, wrist-based running power”; “heart rate variability (HRV) status, Pulse Ox”; “up to 13 days of battery life in smartwatch mode”; “Available to purchase on garmin.com starting May 15, 2026, Forerunner 70 has a suggested retail price of $249.99”. Accessed October 6, 2026. https://www.garmin.com/en-US/newsroom/press-release/sports-fitness/run-further-with-forerunner-70-and-forerunner-170-from-garmin/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

14. Apple. “Compare Apple Watch Models” (Series 12, SE 3, Ultra 4). — Series 12 from $399, SE 3 from $249, Ultra 4 from $799; Readiness app on Series 12 and Ultra 4, “Not available” on SE 3; Hypertension notifications and ECG app on Series 12 and Ultra 4, “Not available” on SE 3; SE 3 Vitals app “featuring heart rate, respiratory rate, wrist temperature, and sleep duration” (no HRV); SE 3 battery “Up to 18 hours”. Accessed October 6, 2026. https://www.apple.com/watch/compare/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

15. MyndArc, LLC. “Athlytic: Fitness & Recovery.” Apple App Store listing (id1543571755) — Athlytic Pro (Yearly) $29.99, Athlytic Pro (Monthly) $4.99; “Every morning Athlytic reads your overnight HRV and resting heart rate against your own baseline and tells you how recovered you are. On Apple Watch Series 12 and Ultra 4, Recovery uses Apple’s new Recovery HRV”; Exertion “scored 0 to 10”; “Athlytic Age”; 4.79 from 11,078 US ratings. Accessed October 6, 2026. https://apps.apple.com/us/app/athlytic-fitness-recovery/id1543571755 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

16. WHOOP. “Unlock New with WHOOP 5.0.” WHOOP Support, Aug 27, 2025 — “WHOOP 5.0 delivers up to 14+ days of battery life on a full charge”. Accessed October 6, 2026. https://support.whoop.com/s/article/Unlock-New-with-WHOOP-5-0?language=en_US ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

17. Doherty C, Baldwin M, Lambe R, Burke D, Altini M. “Readiness, recovery, and strain: an evaluation of composite health scores in consumer wearables.” Translational Exercise Biomedicine, 2025;2(2):128-144. doi:10.1515/teb-2025-0001. Not indexed in PubMed. “We identified 14 CHS across 10 major wearable manufacturers”; “heart rate variability (86 %), resting heart rate (79 %), physical activity (71 %), and sleep duration (71 %)”; “None of the manufacturers disclosed their exact algorithmic formulas”. https://www.degruyterbrill.com/document/doi/10.1515/teb-2025-0001/html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

18. 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”; WHOOP “writes sleep, resting heart rate, respiratory rate, blood oxygen, workouts, and workout calories” and “does not write HRV, because WHOOP calculates HRV as rMSSD while Apple Health stores SDNN”; “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.” 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

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

20. Google Store. “Google Fitbit Air tech specs.” — “5.2 g without band, 12 g with band”; “Battery life of up to 7 days”; “Android 11.0 or higher, Apple iOS 16.4 or higher”. Accessed October 6, 2026. https://store.google.com/us/product/google_fitbit_air_specs?hl=en-US ↩ ↩² ↩³ ↩⁴ ↩⁵

21. Google. “A new era for your health and wellness.” The Keyword, May 7, 2026 — Google Health Premium “plans start at $9.99 per month or $99 per year”; “This discreet, screenless tracker”; “Every Fitbit Air comes with 3 months free of Google Health Premium, and is available in a variety of colors for $99, or $129 for the Special Edition.” Accessed October 6, 2026. https://blog.google/products-and-platforms/products/google-health/google-health-fitbit/ ↩ ↩² ↩³ ↩⁴ ↩⁵

22. Oura Team. “Introducing Oura Ring 5: The World’s Smallest Smart Ring.” The Pulse blog, May 28, 2026 — “40% smaller than Oura Ring 4”; “between 6 to 9 days of battery life”; “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 October 6, 2026. https://ouraring.com/blog/introducing-oura-ring-5/ ↩ ↩² ↩³ ↩⁴

23. Ultrahuman. “Ring PRO.” US product page — “Dynamic Recovery adapts to your body in real time”; Stress Rhythm analyzes “HR, HRV, and RHR”. Accessed October 6, 2026. https://www.ultrahuman.com/us/ring-pro/ ↩ ↩² ↩³

24. CNBC. “Samsung Galaxy Ring launch: Price, specs, feature, availability.” July 10, 2024 — “The Samsung Galaxy Ring will be available on July 24 and starts at $399.99.” Accessed October 6, 2026. https://www.cnbc.com/2024/07/10/samsung-galaxy-ring-launch-price-specs-feature-availability.html ↩ ↩² ↩³

25. 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.” Accessed October 6, 2026. https://news.samsung.com/global/samsungs-expanded-wearables-portfolio-unlocks-intelligent-health-experiences-for-all ↩ ↩² ↩³ ↩⁴

26. Oura Team. “Oura Secures Decisive Legal Victory with ITC Patent Ruling.” 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 and RingConn have announced a comprehensive settlement and patent license agreement”; “ŌURA has granted RingConn a multi-year license”. Accessed October 6, 2026. https://ouraring.com/blog/oura-itc-case/ ↩ ↩² ↩³

27. 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 October 6, 2026. https://techcrunch.com/2026/03/24/ultrahuman-ramps-up-u-s-push-with-ring-pro-as-oura-tightens-grip/ ↩ ↩²

28. Approximation computed from list prices: $99.99 for Fitbit Air plus $99 a year for Google Health Premium for three years. Because 3 months of Premium are included with every Fitbit Air, the real figure is slightly lower. ↩

29. Cailbhe Doherty. “How trustworthy is your fitness tracker score?” The Conversation, April 10, 2025 — “Most companies don’t disclose how exactly they turn raw data into a final score”; “Use your fitness tracker as a guide, but not as your coach, your doctor, or your judge.” Author byline at publication: Assistant Professor in the School of Public Health, Physiotherapy and Sports Science, University College Dublin; his UCD profile now lists him as Associate Professor (https://people.ucd.ie/cailbhe.doherty). Accessed October 6, 2026. https://theconversation.com/how-trustworthy-is-your-fitness-tracker-score-253883 ↩ ↩²

30. Eric Topol. “The Big Holes in Wearable Heart Rate Variability And Readiness Scores.” Ground Truths, September 19, 2026 — “These are proprietary scores that integrate different metrics for each of the wearables: no algorithms have been disclosed. They are unvalidated against health outcomes”; “Since none of these are standardized, they are not interchangeable, so if you get a 90 for Oura that has no relationship to a 90 on a Google Fitbit Air”; “Notably, the company can update its algorithm for readiness score at any point without notification to device users”; “Only resting heart rate has been shown consistently across devices to be extremely accurate.” Author’s role per his Scripps Research faculty page: “Director & Founder, Scripps Research Translational Institute; Senior Consultant, Scripps Clinic, Division of Cardiovascular Diseases” (https://www.scripps.edu/faculty/topol/). Accessed October 6, 2026. https://erictopol.substack.com/p/the-big-holes-in-wearable-heart-rate ↩ ↩² ↩³

31. Marco Altini. “[Paper] Readiness, recovery, and strain: an evaluation of composite health scores in consumer wearables.” Marco Altini’s Substack, April 10, 2025 — author bio: “co-founder of HRV4Training, Endurance Coach at Destination Unknown, advisor at Oura”. Accessed October 6, 2026. https://marcoaltini.substack.com/p/paper-readiness-recovery-and-strain ↩

32. Marco Altini. “Measurements vs made up scores.” Marco Altini’s Substack, November 22, 2023 — “if you want to use a wearable, at least use it to look at the physiology, and ignore made-up metrics (recovery, readiness, etc.)”. Accessed October 6, 2026. https://marcoaltini.substack.com/p/measurements-vs-made-up-scores ↩

33. 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.” Physiological Reports, 2025;13(16):e70527. PMID: 40834291. https://pubmed.ncbi.nlm.nih.gov/40834291/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

34. Bellenger CR, Miller DJ, Halson SL, Roach GD, Sargent C. “Wrist-Based Photoplethysmography Assessment of Heart Rate and Heart Rate Variability: Validation of WHOOP.” Sensors (Basel), 2021;21(10):3571. PMID: 34065516. https://pubmed.ncbi.nlm.nih.gov/34065516/ ↩ ↩²

35. Van Oost CN, Masci F, Malisse A, Schyvens AM, Peters B, Dirix H, Ross V, Wets G, Neven A, Verbraecken J, Aerts JM. “Accuracy of Heart Rate Measurement Under Transient States: A Validation Study of Wearables for Real-Life Monitoring.” Sensors (Basel), 2025;25(20):6319. PMID: 41157371. https://pubmed.ncbi.nlm.nih.gov/41157371/ ↩ ↩²

36. 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. PMID: 39409260. https://pubmed.ncbi.nlm.nih.gov/39409260/ ↩ ↩²

37. 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.” Physiological Measurement, 2020;41(4):04NT01. PMID: 32217820. https://pubmed.ncbi.nlm.nih.gov/32217820/ ↩

38. Doherty C, Baldwin M, Keogh A, Caulfield B, Argent R. “Keeping Pace with Wearables: A Living Umbrella Review of Systematic Reviews Evaluating the Accuracy of Consumer Wearable Technologies in Health Measurement.” Sports Medicine, 2024;54(11):2907-2926. PMID: 39080098. https://pubmed.ncbi.nlm.nih.gov/39080098/ ↩ ↩²

39. Schyvens AM, Peters B, Van Oost NC, Aerts JM, Masci F, Neven A, Dirix H, Wets G, Ross V, Verbraecken J. “A performance validation of six commercial wrist-worn wearable sleep-tracking devices for sleep stage scoring compared to polysomnography.” Sleep Advances, 2025;6(2):zpaf021. PMID: 40303381. https://pubmed.ncbi.nlm.nih.gov/40303381/ ↩ ↩² ↩³ ↩⁴

40. 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. PMID: 41230431. https://pubmed.ncbi.nlm.nih.gov/41230431/ ↩ ↩² ↩³

41. 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. PMID: 36016077. https://pubmed.ncbi.nlm.nih.gov/36016077/ ↩ ↩²

42. Miller DJ, Lastella M, Scanlan AT, Bellenger C, Halson SL, Roach GD, Sargent C. “A validation study of the WHOOP strap against polysomnography to assess sleep.” Journal of Sports Sciences, 2020;38(22):2631-2636. PMID: 32713257. https://pubmed.ncbi.nlm.nih.gov/32713257/ ↩ ↩²

43. Chinoy ED, Cuellar JA, Huwa KE, Jameson JT, Watson CH, Bessman SC, Hirsch DA, Cooper AD, Drummond SPA, Markwald RR. “Performance of seven consumer sleep-tracking devices compared with polysomnography.” Sleep, 2021;44(5):zsaa291. PMID: 33378539. https://pubmed.ncbi.nlm.nih.gov/33378539/ ↩

44. WHOOP. “Advanced Labs | Availability, Access, and Pricing.” WHOOP Support, Aug 12, 2026 — “75+ biomarkers per test”; Basic 1 test per year $199, Standard 2 tests $349, Expanded 4 tests $599, Comprehensive 6 tests $899; “powered by Quest”; “Testing is not currently available in Hawaii, North Dakota, South Dakota, Wyoming, or Arizona.” Accessed October 6, 2026. https://support.whoop.com/s/article/Advanced-Labs-Availability-Access-and-Pricing?language=en_US ↩ ↩² ↩³ ↩⁴

45. Elise Reuter. “FDA drops Whoop warning letter over blood pressure feature.” MedTech Dive, June 24, 2026 — “The Food and Drug Administration has dropped a warning letter against wearable device firm Whoop following changes the company made to its blood pressure feature”; “When the FDA sent a warning letter to Whoop in July”. Accessed October 6, 2026. https://www.medtechdive.com/news/fda-drops-whoop-warning-letter-over-blood-pressure-feature/823652/ ↩

46. Starlight Tech LLC. “Bevel: AI Health Coach.” Apple App Store listing (id6456176249) — Bevel Pro Monthly $14.99, Annual $99.99; “Recovery Score: Your daily readiness, simplified”; “Strain Score”; “Bevel calculates your biological age using key health markers like sleep, activity, resting heart rate, and more”; 4.85 from 16,828 US ratings. Accessed October 6, 2026. https://apps.apple.com/us/app/bevel-ai-health-coach/id6456176249 ↩ ↩² ↩³ ↩⁴ ↩⁵

47. Manresa-Rocamora A, Sarabia JM, Javaloyes A, Flatt AA, Moya-Ramón M. “Heart Rate Variability-Guided Training for Enhancing Cardiac-Vagal Modulation, Aerobic Fitness, and Endurance Performance: A Methodological Systematic Review with Meta-Analysis.” International Journal of Environmental Research and Public Health, 2021;18(19):10299. PMID: 34639599. https://pubmed.ncbi.nlm.nih.gov/34639599/ ↩ ↩²

48. Ray Maker. “Polar Loop First Thoughts: Actually a Whoop Competitor?” DC Rainmaker, September 3, 2025 — “Because it doesn’t have GPS in it, you won’t get that data by default”; “I have yet to capture a single workout correctly”; “Just because it’s positioned as a competitor, doesn’t make it a true replacement.” Accessed October 6, 2026. https://www.dcrainmaker.com/2025/09/polar-loop-first-thoughts-actually-competitor.html ↩ ↩²

49. Gentler Stories d.o.o. “Gentler Streak Workout Tracker.” Apple App Store listing (id1576857102) — Gentler Premium Monthly $8.99, Gentler Premium Yearly $39.99; “Receive workout suggestions that respond to your readiness”; 4.71 from 8,824 US ratings. Accessed October 6, 2026. https://apps.apple.com/us/app/gentler-streak-workout-tracker/id1576857102 ↩ ↩² ↩³

50. Ray Maker. “Amazfit Helio Band In-Depth Review: $99 & No Sub Fee, But Worth it?” DC Rainmaker, June 24, 2025 — “within the Amazfit ecosystem, it doesn’t calculate/handle a ‘Readiness’ score”. Accessed October 6, 2026. https://www.dcrainmaker.com/2025/06/amazfit-helio-band-in-depth-review-99-no-sub-fee-but-worth-it.html ↩

51. Origami, Inc. “SensAI: Fitness Sensei.” Apple App Store listing (id6738963099) — “Try free for 7 days. No subscription required to start.”; “Requires iOS 26 or later. Apple Watch support requires watchOS 26 or later.”; SensAI Premium Monthly $6.99, SensAI Premium Yearly $69.99; iPhone and Apple Watch; 4.6 from 36 US ratings. Accessed October 6, 2026. https://apps.apple.com/us/app/sensai-fitness-sensei/id6738963099 ↩ ↩² ↩³

52. TechCrunch. “Apple could take on Whoop with a new fitness tracker, report says.” September 22, 2026 — citing Bloomberg, the device is “described as ‘a thin fabric band with a sensor-equipped computing module’” and “would not be released until at least 2028”. Accessed October 6, 2026. https://techcrunch.com/2026/09/22/apple-could-take-on-whoop-with-a-new-fitness-tracker-report-says/ ↩