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Smart ring

Oura Ring 5

Silver finish, whole sizes 6 to 13, plus Oura Membership

$399US price, checked Oct 23, 2026

Compact titanium sleep ring that needs a paid membership

Check price at Oura Full review →

Smart ring

Oura Ring 4

Silver finish, plus Oura Membership billed separately

$349US price, checked Oct 23, 2026

Oura's previous-generation smart ring, with the membership billed separately

Check price at Oura Full review →

Smart ring

Ultrahuman Ring PRO

Aster Black finish, whole sizes 5 to 14, with PRO Charging Case

$479US price, checked Oct 23, 2026

Subscription-free titanium ring with its charging case included

Check price at Ultrahuman Full review →

Smart ring

RingConn Gen 3

Matte Black finish, sizes 6 to 15 (or 'Don't know my size' with the free Gen 3 sizing kit), charging case included

$349US price, checked Oct 23, 2026

Subscription-free sleep and recovery ring with up to 14 days of battery

Check price at RingConn Full review →

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Criterion	Oura Ring 5	Oura Ring 4	Ultrahuman Ring PRO	RingConn Gen 3
US price	$399Checked Oct 23, 2026 · Price details in the review	$349Checked Oct 23, 2026 · Price details in the review	$479Checked Oct 23, 2026 · Price details in the review	$349Checked Oct 23, 2026 · Price details in the review
Three-year ownership estimate	$608.97 Incomplete known subtotal. Not included: energy use.	$558.97 Incomplete known subtotal. Not included: energy use.	$479 Incomplete known subtotal. Not included: energy use.	$349 Incomplete known subtotal. Not included: energy use.
Choose if	You wear a whole ring size from 6 to 13, want sleep staging and readiness scores without a wrist device, and will keep paying for membership.	You want Oura's sleep, heart-rate and temperature-trend tracking in the previous-generation ring and don't need Ring 5's smaller size.	You wear a whole ring size from 5 to 14, want long battery life and would rather pay $479 once than pay a yearly membership.	You wear a size 6 to 15, want overnight sleep, HRV and temperature trends from a ring, and would rather pay $349 once than pay a yearly membership.
Main trade-off	Without a membership the app shows only three daily scores, and Ring 5 stores three days of data, compared with seven on Ring 4.	You pay a yearly membership for full features, and Oura says Ring 5 is 40% smaller, with greater accuracy and battery power.	Ultrahuman publishes no accuracy figures for Ring PRO, some features are paid PowerPlugs, and theft and loss support comes only with the Max membership.	The vascular and sleep apnea insights have no published accuracy data, and returns need a valid reason such as a defect.
Key specifications	Battery life: 6 to 9 days, depending on ring size and usage. A full charge takes about 80 minutes, depending on battery level Sensors: Red, green and infrared LEDs with 2 photodetectors, plus a temperature sensor and an accelerometer Membership: $5.99 a month or $69.99 a year (US, before tax). New members get the first month included, but adding a ring to an existing account doesn't add another free month Sizes: Whole sizes 6 to 13 only. Oura recommends the Ring 5 sizing kit first, since Ring 4 sizing differs Water resistance: 100 m (328 ft), IP68. Oura says it's not for diving On-ring data storage: Up to 3 days (up to 7 days on Ring 4) Compatibility: iOS and Android, over Bluetooth 5.0 US import status: In January 2026, the US International Trade Commission (ITC) opened Samsung's patent case seeking to bar imports of Oura wearables (Investigation No. 337-TA-1478). The ITC's notices through Oct 26, 2026 show the case still open, with no violation finding or exclusion order	Battery life: 5 to 8 days. A charge typically takes 20 to 80 minutes, depending on battery level. Oura says battery life and longevity depend on ring size, app settings and feature configuration Sensors: Red and infrared LEDs for blood oxygen. Green and infrared LEDs for heart rate, heart rate variability and respiration rate. A digital temperature sensor and an accelerometer Membership: $5.99 a month or $69.99 a year in the US, before tax. New members get the first month free. The ring has limited functionality without it Water resistance: Up to 100 m (328 ft) Compatibility: iOS and Android Connectivity: Bluetooth Low Energy, with airplane mode support. Firmware updates come through the Oura App. Oura lists the ring as FCC-certified Weight: 3.3 to 5.2 g depending on size US import status: In January 2026, the US International Trade Commission (ITC) opened Samsung's patent case seeking to bar imports of Oura wearables (Investigation No. 337-TA-1478). The ITC's notices through Oct 26, 2026 show the case still open, with no violation finding or exclusion order	Battery life: Up to 15 days (about 12 days in Turbo Mode, 15+ days in Chill Mode). Up to 45 days between wall charges with the PRO Charging Case. About 2.5 hours for a full charge. Sensors: Temperature sensor, redesigned PPG sensor and 6-axis IMU. Dual-core processor with on-chip machine learning. Subscription: No recurring subscription fees for accessing your data. Optional PowerPlugs cost extra: Cardio Adaptability, for example, is $24 for 1 year or $38 for 2 years, and Cycle & Ovulation Pro is $39 for 1 year or $69 for 2 years. The buy page also offers an optional membership, Ultrahuman Max, at $9.99 a month or $99.99 for one year, which includes PowerPlugs and UltrahumanX coverage. Data storage: Up to 250 days of data on internal and external flash, per Ultrahuman's comparison page. Up to 1 year of ring data backed up to the PRO Charging Case. Water resistance: 100 m (328 ft) Sizes: 5 to 14, no half sizes. Weight and thickness: 3.3 to 4.8 g depending on size. 2.65 mm thick (varies by size). US import status: Allowed, with conditions. The US International Trade Commission (ITC) barred imports of Ultrahuman rings that infringe an Oura patent on August 21, 2025, after finding that Ring AIR did. In March 2026, US Customs ruled that Ring PRO's redesigned unibody ring falls outside that order. Each import needs a certification that Customs approves. Ultrahuman's US store listed Ring PRO for sale on Oct 23, 2026.	Battery life: Up to 14 days: 10 to 12 days with vibration on, 11 to 14 days with it off. Charging takes about 90 minutes for the ring and about 120 minutes for the case Sensors: Optical heart-rate sensor, temperature sensor, 3-axis accelerometer and vibration feedback motor Subscription: None. The page says 'No Subscription Required' Metrics tracked: Around the clock: heart rate, HRV, SpO2, respiratory rate, skin temperature, stress, steps and calories. During sleep: sleep duration, sleep stages, sleep apnea risk indicators and overnight vascular load trends Water resistance and operating range: IP68 / 10 ATM, to 100 m (328 ft). Operating temperature 32°F to 104°F (0°C to 40°C) Sizes: 6 to 15, plus a 'Don't know my size' option. Gen 3 uses a different sizing system from earlier RingConn rings. RingConn recommends its free sizing kit, which it sends before the ring ships Thickness and weight: 2.3 mm thick, 2.5 to 3.5 g Data and compatibility: The ring stores 10 days of data offline. Works with iOS 17.0 or later and Android 10.0 or later over Bluetooth 5.0. Syncs with Apple Health and Google Health Connect US import status: Not barred. The ITC barred imports of infringing RingConn rings on August 21, 2025, then removed RingConn from the order in December 2025 after RingConn settled with Oura and licensed the patent. RingConn's US store listed every Gen 3 color and size as available on Oct 20, 2026
Exact variant	Silver finish, whole sizes 6 to 13, plus Oura Membership	Silver finish, plus Oura Membership billed separately	Aster Black finish, whole sizes 5 to 14, with PRO Charging Case	Matte Black finish, sizes 6 to 15 (or 'Don't know my size' with the free Gen 3 sizing kit), charging case included
Dimensions	6.09 mm wide and 2.28 mm thick, with a 0.7 mm sensor dome. Weight starts at 2 g, depending on ring size.	7.90 mm wide and 2.88 mm thick.	It's 2.65 mm thick, though thickness varies by size. It weighs 3.3 to 4.8 g depending on size. Ultrahuman doesn't state band width or per-size inner diameter.	2.3 mm thick, weighing 2.5 to 3.5 g. RingConn's product page doesn't state the band width or the inner diameter of each size.
Installation	No installation. Oura recommends the Ring 5 sizing kit to choose your size, worn for at least 24 hours first. You can order without a kit if you already have one, or choose 'Size later', which includes a free kit. Oura says the index finger gives the best accuracy. Then pair the ring with the Oura App on iOS or Android.	No installation. It pairs with the Oura app on iOS or Android. It charges on the included size-specific charger with a USB-C cable. Oura offers a free sizing kit with plastic sizers before you order.	No installation. It pairs over Bluetooth (BLE 5.3) with the Ultrahuman app, which is on the App Store and Google Play. In the box are the ring, the Ring PRO Charger and a 1 m USB-C to USB-C cable. Ring PRO charges only on the PRO Charger or PRO Charging Case, not on a Ring AIR charger. Before you order, Ultrahuman offers a free sizing kit with plastic sizers in sizes 5 to 14.	No installation. If you don't know your Gen 3 size, choose the free sizing kit option ('Don't know my size') when you order. RingConn sends the kit before the ring ships, and it arrives in 3 to 8 days, depending on location. You then submit your size under 'My Orders'. The ring pairs with your RingConn App account over Bluetooth 5.0, on iOS 17.0 or later or Android 10.0 or later. The box holds the ring, a charging case, a USB-C charging cable and a quick start guide.
Materials	The inner and outer surfaces are titanium, and the inside has no seams. Oura says every finish has a super-hard PVD coating for scratch resistance. This review covers the Silver finish.	The inner and outer surfaces are titanium, and the interior has no seams. Oura says minor scratches from regular wear are normal.	The ring is titanium with a PVD coating, plus epoxy and polycarbonate. Ultrahuman says the inner surface is hypoallergenic plastic and titanium. The charging case is aluminum, stainless steel and plastic.	Titanium alloy, with medical-grade epoxy and a PVD coating. RingConn's FAQ describes the matte finish as non-reflective and understated.
Warranty	A 1-year protection plan comes with the ring. The Silver product page offers upgrades to 2 years for $45 or 3 years for $60. The product page doesn't say what the plan covers, such as battery wear, scratches or loss. Oura's return FAQ says warranty replacements can't be returned or refunded.	A 1-year protection plan is included with purchase. The product page offers upgrades to 2 years for $45 or 3 years for $60.	A 12-month limited warranty runs from delivery and covers defects in materials and workmanship, valid only in the country of purchase. Ultrahuman's Terms of Sale exclude consumable parts such as batteries or protective coatings, unless a defect caused the failure. They also exclude accidents, misuse, normal wear and tear, and cosmetic damage unless a defect caused it. Those terms name Ring AIR, not Ring PRO, and the Ring PRO FAQ confirms only the one-year length. Ultrahuman's buy page lists UltrahumanX coverage, with accidental damage, loss and theft support, as included with the Max membership. Ultrahuman's Terms of Sale say UltrahumanX is not an insurance program. We found no standalone UltrahumanX price.	The warranty runs 1 year from delivery in the US and everywhere else outside the EEA. EEA countries get 2 years. RingConn's Return & Refund Policy says it will repair, replace or refund if a defect in its workmanship causes damage, with proof of purchase. It excludes improper or negligent use, maintenance contrary to instructions, normal wear and tear and accidental damage. The policy calls rechargeable batteries consumables with a limited lifespan, and the standard warranty doesn't include battery replacement. It doesn't say whether cosmetic damage or loss is covered.
Returns	Oura's general Return & Exchange FAQs let you return an order within 30 days of receiving it, if the items are fully functional and undamaged. A ring set has to come back with the ring, charger and USB-C cable. Each item can be returned or exchanged once, and ring exchanges are only for a different size of the same ring. Refunds go to the original payment method, but original shipping, handling and customs fees aren't refunded. Rings bought from other retailers go back through that retailer. Oura says to cancel the membership in the app or Membership Hub when you return a ring, so the charges don't continue.	Bought directly from Oura's online store, the ring can be returned within 30 days of receiving the order, if it's fully functional and undamaged and comes back with the charger and USB-C cable. Ring sets can't be partly returned, exchanges are only for a different size of the same ring, and each item can be returned or exchanged once. Refunds go to the original payment method, but original shipping and handling aren't refunded. Oura's return FAQ says to cancel the membership when you return a ring, and the product page says canceling doesn't entitle you to a full or pro-rated refund of fees you've paid. Warranty replacements can't be returned for a refund, and rings bought from other retailers follow that retailer's policy.	If you're not completely satisfied, you can return it within 30 days of delivery. Send it back in the original packaging with all original accessories, including the charger. The Ring PRO FAQ and the Smart Rings Terms of Sale both say return shipping is free. No restocking fee is stated. The Terms of Sale list these return terms under the Ring AIR heading, and the FAQ applies them to Ring PRO.	RingConn takes returns within 14 days, but only for a valid reason such as a defect, damage on delivery or a wrong color. The ring must be in its original condition, one that 'has not been opened and used'. You pay return shipping. Shipping, handling and tax come back only if the ring was defective or damaged and you sent photos first, or if RingConn made an error. No restocking fee is stated, but RingConn may deduct for damage, wear or missing parts. Sizing kits can't be returned, canceling after one ships costs $10, and for a different size or color the policy says to return the ring and place a new order.
Unresolved questions	What the included 1-year protection plan covers, such as battery wear, scratches or loss The Charging Case's price Whether the two-photodetector design changes heart-rate or sleep-staging accuracy compared with Ring 4 How accurate the ring itself is: the studies behind Oura's accuracy figures were published in 2020 and 2021, before Ring 5 Battery lifespan and replacement options The charger's power draw	Who pays return shipping, which Oura's return FAQ doesn't say How long Oura will keep selling and supporting Ring 4 now that Ring 5 is on sale How accurately Ring 4 itself stages sleep against polysomnography Battery lifespan, out-of-warranty replacement cost and charging power draw The FDA regulatory status of Ring 4 features	Band width and per-size inner diameter Whether a worn-out battery is repaired or replaced at a cost, since the Terms of Sale exclude battery wear from the limited warranty Independent, peer-reviewed accuracy data for Ring PRO against polysomnography or ECG Battery lifespan, out-of-warranty replacement cost and charger power draw Renewal prices for PowerPlugs after the first term The prices of PowerPlugs the buy page doesn't list, and of UltrahumanX coverage sold apart from Max Minimum supported iOS and Android versions How long Ultrahuman will sell and support Ring PRO in the US Whether a later ITC or court decision overrides the customs ruling that lets Ring PRO into the US	Whether RingConn's policy counts a poor fit or a sizing mistake as a valid reason for a return or exchange Whether cosmetic damage or loss is covered What an out-of-warranty battery replacement or repair costs The band width and the inner diameter of each size How the vascular health trend and overnight vascular load are calculated, and whether they've been validated against clinical measures Independent, peer-reviewed accuracy data for Gen 3 against polysomnography, ECG or a home sleep apnea test How many ring charges the case holds The battery's lifespan and the charger's power draw How long RingConn will keep features free of charge and keep supporting Gen 3

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.