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Smart ring

Oura Ring 4

Silver finish, plus Oura Membership billed separately

$349US price, checked Oct 13, 2026

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

Check price at Oura 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	Oura Ring 4	Oura Ring 5
US price	$349Checked Oct 13, 2026 · Price details in the review	$399Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$558.97 Incomplete known subtotal. Not included: energy use.	$608.97 Incomplete known subtotal. Not included: energy use.
Choose if	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 6 to 13, want sleep staging and readiness scores without a wrist device, and will keep paying for membership.
Main trade-off	You pay a yearly membership for full features, and Oura says Ring 5 is 40% smaller with greater accuracy and battery power.	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: 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	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	Silver finish, plus Oura Membership billed separately	Silver finish, whole sizes 6 to 13 chosen with the Ring 5 sizing kit, plus Oura Membership
Dimensions	7.90 mm wide and 2.88 mm thick. It weighs 3.3 to 5.2 g, depending on ring size.	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 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. 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 inner and outer surfaces are titanium, and the interior has no seams. Oura says minor scratches from regular wear are normal.	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 1-year protection plan is included with purchase. The product page offers upgrades to 2 years for $45 or 3 years for $60.	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 bought the ring directly from Oura's online store, you can return it within 30 days of receiving the order. It has to be fully functional and undamaged, and come 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. Rings bought from other retailers follow that retailer's policy. Oura's return FAQ says to cancel the membership when you return a ring. The Ring 4 Silver 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.	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	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, which the pages checked didn't confirm	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.