How we choose sleep trackers and recovery wearables

What earns a place

This guide covers consumer devices worn overnight that report sleep and recovery measures, such as sleep stages, heart rate variability and skin temperature. Each one has to be sold to US buyers. Six of the 13 are smart rings: Oura Ring 5, Oura Ring 4, Ultrahuman Ring PRO, Samsung Galaxy Ring, RingConn Gen 3 and RingConn Gen 2 Air^{2, 4, 9, 12, 16, 34}. Four are screen-free bands: the WHOOP Peak membership with its WHOOP 5.0 strap, Google Fitbit Air, Garmin CIRQA and Polar Loop^{5, 26, 30, 31, 53}. The rest are Apple Watch Series 12, Samsung Galaxy Watch9 and Garmin’s Index Sleep Monitor, a band worn on the upper arm for sleep only^{18, 22, 36}.

On October 13, 2026, upfront prices for the versions we review ran from $99.99 for Fitbit Air to $479 for Ultrahuman Ring PRO^{9, 25}. WHOOP Peak had no upfront price, only a $239 yearly membership⁵. Garmin’s US pages showed no price for CIRQA or the Index Sleep Monitor^{17, 30}. So CIRQA uses the $199.99 in Garmin’s launch release, and the Index uses a $170 retailer listing^{19, 42}.

Oura Ring 4 is the previous generation, and its page now points buyers to Ring 5⁴. Oura still sold it for $349 in Silver when checked, so it stays in as the lower-cost Oura until Oura stops selling it⁴⁰. Bedside and under-mattress sleep trackers and phone apps are outside this guide for now. Each pick names the need it serves, its trade-off and an alternative, and picks are for different needs, not a ranking.

What we weigh

Nine questions decide the picks. Each answer comes from the maker’s own pages and policies, or from a regulator record or study, with the date it was checked.

• Where it’s worn overnight. A ring, a screen-free band, a smartwatch and an upper-arm band suit different sleepers. Garmin presents the Index Sleep Monitor as a band worn on the upper arm, for people who don’t wear their watch at night¹⁸. Ring sizing is maker-specific. Oura says Ring 5 sizing differs from its other models, and its page offers a free sizing kit².
• What you keep paying. We count any required membership over three years. Oura’s membership is $5.99 a month or $69.99 a year after the first month³. Without it, the app shows only the Readiness, Activity and Sleep scores³. WHOOP lists no separate hardware price, so the $239 Peak fee is the whole cost each year⁵. Ultrahuman and RingConn say their rings need no subscription, though Ultrahuman sells optional paid PowerPlugs^{9, 12, 34}. Polar says Loop has no monthly fees and no locked features³¹.
• What coaching costs after a free trial. Some makers keep tracking free but charge for coaching. Fitbit Air includes 3 months of Google Health Premium, which adds a coach built with Gemini^{25, 27}. After that, Premium starts at $9.99, and Google doesn’t say whether that’s a month or a year²⁷. Garmin says CIRQA works without a subscription, but guided workouts need Garmin Connect+^{42, 44}. Garmin priced Connect+ at $6.99 a month or $69.99 a year when it launched in 2025⁴³.
• Which phone it needs. Galaxy Ring requires a compatible Samsung phone, the Samsung Health app and a Samsung account¹⁵. Apple Watch Series 12 needs an iPhone 11 or later on iOS 27 or later²³. Samsung lists Galaxy Watch9’s sleep apnea, Bedtime Guidance and Energy Score features for Android 13 or later, and its page doesn’t mention iPhone³⁶. Fitbit Air works with Android 11 or iOS 16.4 and later²⁶.
• Charging and storage. Stated battery life runs from up to 24 hours of normal use on the Apple Watch to up to 15 days on Ultrahuman Ring PRO^{9, 23}. Ultrahuman also lists up to 250 days of data storage⁹. Samsung’s launch release rates Galaxy Watch9 at up to 30 hours with the always-on display on⁴⁵. A device that needs charging most days has to fit that charge around the nights it’s meant to track.
• Evidence for the model that’s sold. We record whose accuracy figure it is and which device was tested. Oura’s sleep-staging claim traces to a 2021 study of a second-generation research ring^{1, 6}. That ring reached 96% accuracy against polysomnography for sleep versus wake and 79% for four stages⁶. A 2024 systematic review of WHOOP studies from 2020 to 2022 found 62% sleep-stage agreement on average (kappa 0.46)⁸. Where a maker publishes no figure, as Ultrahuman doesn’t for Ring PRO, we say so¹⁰.
• Regulatory status. We record what the maker says and read the FDA record when a clearance is claimed. FDA cleared Apple’s hypertension notification feature on September 11, 2025, through 510(k) K250507²⁴. In the validation study in its summary, the feature flagged 41.2% of people with hypertension and gave no notification to 92.3% of people without it²⁴. FDA’s 2022 clearance of Fitbit Irregular Rhythm Notifications lists older Fitbit devices, and the Fitbit Air pages don’t mention FDA clearance^{25, 26, 29}. Samsung says the FDA regulates Galaxy Watch9’s sleep apnea feature as a medical device³⁶. FDA granted that feature a De Novo authorization in February 2024⁵². In FDA’s review, it flagged 82.7% of people with moderate to severe obstructive sleep apnea and gave no notification to 87.7% of people without it⁴⁷. A version 2.0 was cleared in July 2026, but neither FDA document names Galaxy Watch9^{47, 48}. Ultrahuman says Ring PRO isn’t a medical device, and RingConn says the same of Gen 3^{10, 12}. Garmin says neither the Index Sleep Monitor nor CIRQA is one^{18, 44}. Polar says Loop isn’t for medical purposes³¹.
• Warranty and returns, term by term. WHOOP’s lifetime warranty lasts only while a membership bought directly from WHOOP stays active⁵. RingConn’s 1-year US warranty excludes battery replacement, and its 14-day returns need a valid reason such as a defect¹⁴. Ultrahuman’s 12-month limited warranty excludes battery wear, while returns within 30 days of delivery come with free return shipping^{10, 11}. Polar’s two-year guarantee doesn’t cover textile bands, and Polar refunds shipping costs only for damaged or defective items^{32, 33}. The Google Store takes back most items within 15 days of receipt²⁸. Samsung.com takes watches back within 15 days of delivery, with a 5% restocking fee unless the watch is damaged or defective⁴⁹.
• Whether it can be sold in the US. A patent case can stop a ring from being imported. In August 2025, the US International Trade Commission (ITC) issued an order barring imports of Ultrahuman and RingConn rings that infringe an Oura patent^{37, 41}. Ultrahuman’s earlier Ring AIR was found to infringe³⁷. In March 2026, US Customs and Border Protection ruled that Ring PRO’s redesigned housing, a single titanium tube, puts it outside that order³⁷. Entry comes with conditions, including a certification³⁷. RingConn settled with Oura and licensed the patent, so in December 2025 the ITC removed RingConn from the order⁴¹.

What we don’t weigh

Scores a maker builds from its own inputs don’t move a device up or down. That includes readiness, recovery and sleep scores, and WHOOP’s Healthspan and Pace of Aging. WHOOP says Healthspan is for wellness purposes only and not for medical use⁵. The pages checked don’t say how WHOOP Age and Pace of Aging are calculated, or whether anyone has independently validated them⁵. Our separate evidence review covers what studies show about these devices’ sleep and heart-rate readings.

We also set aside accuracy claims that rest on the maker’s own comparison or on an earlier model. Apple says Series 12 has the most accurate heart rate sensing in a wearable, citing its own study against best-selling wearables²². Ultrahuman’s FAQ says Ring PRO’s metrics are benchmarked against industry-leading fitness wearables, without figures¹⁰. RingConn presents its vascular health and sleep apnea insights as trends and risk indicators, with no published validation¹². Polar’s page carries the line ‘Lab-tested. Peer-reviewed. Real-world proven.’³¹. We reviewed no study of Loop’s own accuracy.

A study of one generation isn’t carried over to the next. The Oura studies on record tested Gen2 and Gen3 hardware, not Ring 5 or Ring 4, and Oura funded the Gen3 study^{6, 7}.

HSA or FSA eligibility, which Oura, Ultrahuman and RingConn list for their rings, is a payment arrangement, not evidence about the device^{1, 9, 12}. We don’t deduct it from prices.

How facts are checked

Every fact in a product review cites the page it came from and the date it was checked. When a maker’s pages disagree, we record both. On the same day, Samsung’s Galaxy Ring page advertised ‘From $299.99 before trade-in’, while its Titanium Black buy page listed $399.99^{15, 16}. Neither page said which sizes or colors get the lower price^{15, 16}. RingConn’s product page shows ‘14-Day Returns & Exchanges’, but its policy says it doesn’t take returns without a valid reason^{12, 14}. A returned ring must also be unopened and unused¹⁴.

When a page doesn’t display its terms, the fact stays unconfirmed rather than guessed. Garmin’s warranty, returns and accuracy pages loaded their text with JavaScript when checked^{20, 21, 50}. So the warranty and return terms for both Garmin devices, and the Index Sleep Monitor’s accuracy, are recorded as not confirmed. Google’s warranty pages don’t name Fitbit Air, so its US warranty isn’t confirmed^{38, 39}. A figure that isn’t published is recorded as not stated by the manufacturer, never as zero.

How prices and memberships are checked

Prices are US prices for the exact variant on the official product page on the check date, before tax and shipping. Where the maker’s page shows no price, we use another price we can source and say where it came from. Garmin’s US page showed no price for the Index Sleep Monitor, so we use REI’s $170.00 listing, with both sizes marked sold out^{17, 19}. Garmin’s June 2025 launch release gave a suggested retail price of $169.99¹⁸.

Garmin’s CIRQA page showed no price either³⁰. For CIRQA we use the $199.99 suggested retail price in Garmin’s July 2026 launch release⁴². REI listed it at $200.00 on the check date, with no sale price⁵¹.

When a page shows only a ‘From’ price, we use it and say so. Google lists Fitbit Air ‘From $99.99’ with no separate price for the Classic edition²⁵. Samsung’s pages disagree on Galaxy Watch9, so we use the buy page and flag the gap. It lists the 40mm at $429.99 without saying whether that’s Bluetooth or LTE⁴⁶. Samsung’s main page says ‘From $379.99’, and its launch release starts Bluetooth at $379.99 and LTE at $429.99^{36, 45}.

A sale label is checked against the maker’s store listing. RingConn labels Matte Black ‘Sale price $349.00’ with no strikethrough, and its store listing shows the same figure as the regular price^{12, 13}. So $349 counts as the list price. RingConn Gen 2 Air’s $199 is handled the same way, since its store listing also shows a matching regular price^{34, 35}.

Trade-in credit, coupon codes, member rewards, financing and HSA or FSA savings aren’t deducted. Optional protection plans and add-ons are named but not added, such as Oura’s upgrade to a 2-year protection plan for $45 and Ultrahuman’s paid PowerPlugs^{2, 9}.

Memberships count in the three-year estimate. It adds the purchase, any installation, three years of recurring fees and parts, and electricity at an editable rate. For a membership with no hardware price, such as WHOOP Peak, the purchase is $0 and the yearly fee goes in recurring costs.

WHOOP Peak’s $239 a year comes to $717 over three years if it renews at that price⁵. WHOOP’s membership page doesn’t state the renewal price⁵. Oura Ring 5 at $399 plus $69.99 a year comes to $608.97 over three years^{2, 3}. Paying monthly at $5.99 makes the membership $71.88 a year instead³.

Where a maker doesn’t say whether features need a paid plan, the fee stays unknown rather than zero. No Garmin page checked says the Index Sleep Monitor’s features need no paid plan, so its estimate is incomplete^{17, 18}. Optional coaching with no stated billing period, such as Google Health Premium after its free months, is named but not added²⁷. Optional plans with a stated price, such as Garmin Connect+ for CIRQA, are named but not added either⁴³. None of the makers states charging power draw, so electricity shows as unknown for every device.

What we don’t do

These limits apply to every wearable review and pick.

• We don’t give scores, star ratings or a single overall winner.
• We don’t rank by readiness, recovery, healthspan or longevity claims, and we don’t give medical advice. A notification flags a possible sign for follow-up, not a diagnosis. FDA’s summary for Apple’s hypertension feature says the absence of a notification doesn’t indicate the absence of hypertension²⁴.
• We don’t count an unknown fee as zero, or carry one model’s accuracy figure over to another.
• We don’t present a sale price as a list price, or deduct trade-in credit, coupons or HSA and FSA savings.

Sources

1. Oura Ring 5 Oura · manufacturer
2. Oura Ring 5, Silver Oura · manufacturer
3. Oura Membership Oura · manufacturer
4. Oura Ring 4 Oura · manufacturer
5. WHOOP Membership WHOOP · manufacturer
6. The Promise of Sleep: A Multi-Sensor Approach for Accurate Sleep Stage Detection Using the Oura Ring Sensors (MDPI), 2021
7. Accuracy of Three Commercial Wearable Devices for Sleep Tracking in Healthy Adults Sensors (MDPI), 2024
8. Accuracy of Fitbit Charge 4, Garmin Vivosmart 4, and WHOOP Versus Polysomnography: Systematic Review JMIR mHealth and uHealth, 2024 · systematic review
9. Ultrahuman Ring PRO US buy page Ultrahuman · manufacturer
10. Ring PRO FAQ Ultrahuman · manufacturer
11. Smart Rings Terms of Sale Ultrahuman · manufacturer
12. RingConn Gen 3 Smart Health Ring RingConn · manufacturer
13. RingConn Gen 3 listing on RingConn's store (prices and regular prices) RingConn · manufacturer · data file
14. RingConn Return & Refund Policy RingConn · manufacturer
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18. Rest easy with the Index Sleep Monitor smart sleep band from Garmin Garmin Newsroom, 2025 · manufacturer
19. Garmin Index Sleep Monitor (retailer listing) REI Co-op
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27. Google Health Premium with Google Health Coach Google Store · manufacturer
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29. 510(k) K212372: Fitbit Irregular Rhythm Notifications US Food and Drug Administration, 2022 · regulator
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31. POLAR Loop: Screen-Free Wearable Health Band & Fitness Tracker Polar · manufacturer
32. Warranty | Polar USA Polar · manufacturer
33. Return policy | Polar USA Polar · manufacturer
34. RingConn Gen 2 Air RingConn · manufacturer
35. RingConn Gen 2 Air listing on RingConn's store (prices and regular prices) RingConn · manufacturer · data file
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41. Notice of Commission determination to institute modification and rescission proceedings, Investigation No. 337-TA-1398 US International Trade Commission, 2025 · regulator
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43. Elevate your health and fitness goals with Garmin Connect+ Garmin Newsroom, 2025 · manufacturer
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45. Samsung Galaxy Watch Ultra2 and Watch9: Your Health Companion on the Wrist Samsung Newsroom US, 2026 · manufacturer
46. Buy the Graphite Samsung Galaxy Watch9 44mm with Bluetooth Samsung US · manufacturer
47. De Novo classification request for Sleep Apnea Feature (DEN230041) decision summary US Food and Drug Administration, 2024 · regulator
48. K261011 clearance letter and 510(k) summary: Sleep Apnea Feature (v2.0) US Food and Drug Administration, 2026 · regulator
49. What is Samsung's return policy? Samsung US Help Center · manufacturer
50. Shipping, Returns & Refunds Garmin · manufacturer
51. Garmin CIRQA Smart Band (retailer listing) REI Co-op
52. De Novo DEN230041: Sleep Apnea Feature US Food and Drug Administration, 2024 · regulator
53. How Long Does WHOOP Battery Last? 14+ Days Explained WHOOP · manufacturer