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Our no-membership ring pick

Ultrahuman Ring PRO

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

$479US price, checked Oct 13, 2026

Subscription-free titanium ring with its charging case included

Check price at Ultrahuman Full review →

Our all-round ring pick

Oura Ring 5

Silver finish, whole sizes 6 to 13 chosen with the Ring 5 sizing kit, plus Oura Membership

$399US price, checked Oct 13, 2026

Compact titanium sleep ring that needs a paid membership

Check price at Oura Full review →

Criterion	Ultrahuman Ring PRO	Oura Ring 5
US price	$479Checked Oct 13, 2026 · Price details in the review	$399Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$479 Incomplete known subtotal. Not included: energy use.	$608.97 Incomplete known subtotal. Not included: energy use.
Choose if	Anyone in a whole ring size from 5 to 14 who wants long battery life and would rather pay $479 once than pay a yearly membership.	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.
Main trade-off	Ultrahuman publishes no Ring PRO accuracy figures on the pages checked, some features are paid PowerPlugs, and theft and loss cover needs the $54 two-year UltrahumanX plan.	Without a membership the app shows only three daily scores, and Ring 5 stores three days of data, compared with seven on Ring 4.
Key specifications	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. Cycle & Ovulation Pro is $39 for 1 year or $69 for 2 years. 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. Ultrahuman says its sizes may differ slightly from standard US ring sizes. Weight and thickness: 3.3 to 4.8 g depending on size. 2.65 mm thick (varies by size).	Battery life: Up to 6 to 9 days, depending on ring size and usage. About 80 minutes to charge, 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. The Ring 5 sizing kit is required, 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
Exact variant	Aster Black finish, whole sizes 5 to 14, with PRO Charging Case	Silver finish, whole sizes 6 to 13 chosen with the Ring 5 sizing kit, plus Oura Membership
Dimensions	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 on the pages checked.	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.
Installation	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. Choose your size with the Ring 5 sizing kit, wearing it for at least 24 hours first. Oura says the index finger gives the best accuracy. Then pair the ring with the Oura App on iOS or Android.
Materials	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.	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.
Warranty	A 12-month limited warranty runs from delivery and covers defects in materials and workmanship. It's valid only in the country of purchase. The Terms of Sale, which don't name Ring PRO, exclude consumable parts such as batteries or protective coatings unless a defect caused the failure. They also exclude accidents, misuse and normal wear and tear. Cosmetic damage such as scratches and dents isn't covered unless a defect caused it. Upgrading through trade-in resets the warranty. Optional UltrahumanX coverage costs $36 for 1 year, with accidental damage protection and priority care. The $54 plan for 2 years adds theft and loss protection and what Ultrahuman calls weight loss insurance.	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.
Returns	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.	Oura's general Return & Exchange FAQs let you return an order within 30 days of receiving it. Items must be 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.
Unresolved questions	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 Minimum supported iOS and Android versions How long Ultrahuman will sell and support Ring PRO in the US	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

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.