The Oura Ring 4 is the default recommendation in this category and the highest-rated ring here at 4.4. PCMag scored it 4 out of 5 and Android Police 8.5 out of 10, both pointing at the same strengths: sleep and recovery tracking, up to eight days of battery, and a fully titanium body with the old sensor bumps flattened out. It costs $349, then $5.99 a month, and without that subscription you get three daily scores and little else.
Full review
Flat sensors instead of the Gen 3's domes
The visible change from the Gen 3 is inside the band: the raised sensor domes are gone, replaced by a flat interior that Oura pairs with software it calls Smart Sensing to pick a signal path across the finger rather than reading from fixed points. The practical benefit is comfort, because nothing digs in overnight and fingers that swell by morning have an easier time. The titanium shell is the same premium object it always was, and it scuffs, which is worth knowing before wearing it through a gym session.
Built for sleep and recovery, not workouts
What the ring is good at is the passive half: sleep staging, overnight heart rate, skin temperature trend, and the readiness score that reads all three back to you in the morning. Naps are picked up automatically. PCMag's 4 out of 5 and Android Police's 8.5 out of 10 both carry the same caveat, which is that exercise is the weak side. There is no GPS and workout detection is coarse next to a watch, so this is a device for understanding recovery rather than recording training.
Up to eight days between charges
Battery is quoted at up to eight days and lands in the five-to-eight range in normal use, the longest stretch in this category and the reason people keep wearing it. Charging uses a proprietary dock rather than a cable you already own, and a full top-up runs from roughly twenty to eighty minutes depending on how empty it is. Water resistance is rated to 100 metres, for up to twelve hours submerged.
$5.99 a month to see your own history
The subscription is the recurring objection. $349 buys the hardware; $5.99 a month or $69.99 a year buys the history, the trends and the guidance, and without it the app collapses to three daily scores. Everything that makes the ring interesting over months rather than days sits behind that paywall, and rival rings from RingConn and Ultrahuman do not charge for it. That is a fair thing to weigh against hardware which is otherwise the best in the category.
Sizes 4 to 15, and no screen at all
Sizes run from 4 to 15, wider than the Gen 3 managed, and the ring weighs between 3.3 and 5.2 grams depending on size, light enough to sleep in without noticing. There is no screen, which is the point for some buyers and a dealbreaker for others: every number lives in the app, so a glance at a wrist is replaced by unlocking a phone. Anyone who wants live feedback mid-workout is buying the wrong device.
Strengths
- +Improved 8-day battery life (up from 7 days)
- +Fully titanium build with wider range of sizes (4-15)
- +Accurate health tracking including heart rate, sleep stages, and body temperature
- +Sleek design with no sensor bumps on interior
Watch-outs
- −Requires a subscription for full features; basic data only available without membership
- −Not the best for detailed workout data tracking
- −No built-in GPS for outdoor activities
How it compares
The Oura Ring Gen 4 offers the most comprehensive health tracking and longest battery life of the group, but it requires a subscription unlike the RingConn Gen 2 Air, which provides basic tracking without one. While it's more accurate than the Samsung Galaxy Ring in health metrics, it lacks the lightweight comfort of the Ultrahuman Ring Air and GPS capabilities.
Rating sources
Our 4.4 score is the average of these published ratings. More about methodology.
