The old question was Oura Ring 4 versus Ultrahuman Ring AIR. Since 2026, the real showdown has become Oura Ring 5 vs Ultrahuman Ring Pro. Both manufacturers have updated their hardware, but not in the same direction. To also compare RingConn, Samsung, Amazfit and wrist-worn devices, the comparison of smart rings and connected health devices provides an overview.
My quick verdict: the Oura Ring 5 is the most defensible choice for sleep and recovery if you do not mind the subscription. The Ultrahuman Ring Pro makes more sense if you reject recurring fees or prioritize battery life. This verdict remains provisional. Both generations are too recent for a direct independent comparison against polysomnography and electrocardiography.
This point changes how you should read the entire comparison. A spec sheet can prove that a ring is thinner or that its battery lasts longer in a manufacturer’s test. It does not prove that sleep stages, HRV or AI advice are more accurate.
Oura Ring 5 vs Ultrahuman Ring Pro: comparison table
The specifications below come from official pages consulted on July 26, 2026. The Ring Pro’s price and ordering status were checked again on the French store on October 13, 2026. Advertised battery life varies with size, enabled features, settings and battery age.
| Criterion | Oura Ring 5 | Ultrahuman Ring Pro | Advantage on paper |
|---|---|---|---|
| Status (Oura: July 26; Pro: October 13, 2026) | Available for purchase | Add-to-cart option available, delivery time to be confirmed | To be confirmed |
| Thickness | 2.28 mm | 2.65 mm depending on size | Oura |
| Weight | From 2 g | 3.3–4.8 g | Oura |
| Sizes | 6–13 | 5–14 | Ultrahuman |
| Advertised battery life | 6–9 days | Around 12 days in Turbo mode, more than 15 days in Chill mode | Ultrahuman |
| On-ring storage | Up to 3 days | Up to 250 days | Ultrahuman |
| Charging on the go | Case sold separately, up to one month advertised | PRO Charger included, up to 45 days advertised | Ultrahuman |
| Water resistance | 100 m, IP68 | 100 m | Tie |
| Subscription | €5.99 per month or €69.99 per year in the EU after one included month | None for essential data, optional premium PowerPlugs | Ultrahuman |
| Published validation | Studies on Gen3 and Ring 4, not yet on Ring 5 | Mostly internal data on Ring AIR, not yet on Ring Pro | Oura |
Check the final price when ordering, including the correct currency, taxes and finish. Ultrahuman’s French website lists €499 for the Ring Pro as checked on October 13, 2026. When checked on July 26, 2026, Oura’s international store listed a starting price of US$399 for the Ring 5, plus the subscription needed for the full experience. These amounts are not directly comparable without currency conversion and equivalent tax treatment.
Hardware: Oura wins on comfort, Ultrahuman on endurance
Oura Ring 5 finally cuts the bulk
Oura claims a volume 40% lower than the Ring 4. The Ring 5 is 6.09 mm wide, 2.28 mm thick and starts at 2 g. That is a real difference compared with the Ring 4’s 7.9 mm width and 3.3–5.2 g weight.
This improvement is not cosmetic. A useful ring is one you wear every night. If it bothers you when you close your hand, rotates on your finger or wakes you up, a sophisticated algorithm will not make up for missing data.
The trade-off is in sizing. The Ring 5 covers sizes 6–13, versus 4–15 for the Ring 4. You must use the new sizing kit. An approximate fit can impair optical contact and therefore signal quality.
Ring Pro prioritizes battery life and offline use
The Ring Pro is heavier than the Ring AIR, at 3.3–4.8 g versus 2.4–3.6 g according to the French technical pages. In return, Ultrahuman advertises up to 250 days of on-ring storage and more than 15 days of battery life in Chill mode.
The important word is mode. The manufacturer specifies around 12 days in Turbo mode and more than 15 days in Chill mode. So do not read “15 days” as a guarantee with every measurement set to maximum. No long-term independent reports yet allow an estimate of the real-world median across several sizes.
For travel or periods without a phone, the advantage remains substantial. Oura stores only three days on the Ring 5. Ultrahuman adds a case that can store up to a year of data and power the ring for 45 days, according to its own tests. That is a concrete benefit, separate from health promises.
Sleep and HRV accuracy: do not confuse a track record with proof
Both rings use a combination of photoplethysmography, skin temperature and movement. These sensors produce signals. Sleep stages and recovery scores are then estimated by algorithms. A ring does not directly measure deep sleep the way an examination recording brain activity, eye movements and muscle tone does.
Oura currently has the strongest scientific evidence base, but you need to read it generation by generation. A 2024 study compared the Oura Gen3 with ambulatory polysomnography in 96 generally healthy adults, for up to three nights per person. Several overall sleep measures were close to the reference. However, the ring slightly underestimated sleep efficiency and time in REM sleep. The study received financial support from Oura, a limitation that should remain explicit.
A study published in 2025 compared nighttime heart rates and HRV from several wearables against an ECG. Across 13 adults and a combined 536 nights across devices, the Oura Ring 4 showed high agreement for HRV, with a concordance coefficient of 0.99 and a mean absolute percentage error of 5.96%. The result is encouraging, but the sample of 13 people remains small and does not concern the Ring 5.
By contrast, Ultrahuman’s public data still consist mainly of internal work. A Ring AIR test involved six volunteers over six days, with comparisons against an Apple Watch and a SleepImage ring. This protocol can explore nighttime heart rate, but it replaces neither independent validation nor polysomnography. As of this update, I have not identified a peer-reviewed publication specifically validating the Ring Pro’s sleep stages or HRV.
So the correct conclusion is neither “Oura is 99% accurate” nor “the two are clinically identical.” It is more restrained: Oura has a better validation track record for its older generations. The relative accuracy of the Ring 5 and Ring Pro remains unknown.
App and AI: Oura is easier to read, Ultrahuman more modular
Oura sells software continuity
Oura organizes its data around Sleep, Readiness and Activity scores, then adds trends in stress, temperature, cardiovascular health and menstrual cycles. The product’s strength lies less in the number of charts than in the consistency of the experience.
However, the Ring 5 is not essential to receive all new software features. Oura says several features announced alongside it remain compatible with Gen3 and later models. If you already own a well-fitting Ring 4, the case for upgrading therefore rests mainly on comfort, size and battery life, not on a new score unavailable elsewhere.
The subscription remains the structural drawback. In the European Union, Oura charges €5.99 per month or €69.99 per year after the first included month. Over three years, that amounts to around €210 on top of the hardware. Without an active subscription, the app’s usefulness becomes much more limited.
Ultrahuman sells an à la carte ecosystem
Ultrahuman retains access to essential data without a mandatory subscription. This wording is more honest than the old “everything is free for life,” because PowerPlugs now include free and premium options. Caffeine windows and circadian alignment may be free, while certain cardiac or partner modules are billed separately.
Jade, the new AI interface, also needs to be put in perspective in terms of evidence. It can connect ring data with data from Blood Vision, the home environment and the M1 CGM. This synthesis may save time, but a recommendation generated from several sensors is not automatically correct just because it looks personalized.
Above all, the Ring Pro does not measure glucose. The M1 is a separate sensor, purchased and worn separately. Metabolic integration is an ecosystem advantage for someone already using these services, not a hidden capability of the ring. To avoid false promises, our analysis of CGMs and non-invasive glucose measurement · FR explains this distinction.
Should you still buy an Oura Ring 4 or an Ultrahuman Ring AIR?
Yes, if the discount is genuine and their trade-offs suit you. A new generation does not erase the usefulness of the old one.
| Previous generation | Oura Ring 4 | Ultrahuman Ring AIR |
|---|---|---|
| Weight | 3.3–5.2 g | 2.4–3.6 g |
| Thickness | Around 2.88 mm | 2.45–2.8 mm depending on size |
| Advertised battery life | 5–8 days | 4–6 days |
| Sizes | 4–15 | 5–14 |
| Subscription | Yes for the full experience | No for essential data |
| Main advantage | App and validation track record | Low weight and no recurring cost |
The Ring AIR still makes the most sense if you want a lightweight ring without a subscription and four to six days of battery life is enough. The Ring 4 retains an advantage if you want the Oura ecosystem, more sizing options and a device already studied for certain nighttime measurements.
Do not replace a working ring just because a new processor or AI has been announced. Switch if it solves a measurable problem: insufficient battery life, an uncomfortable fit, overly frequent syncing or a subscription cost that has become unacceptable.
Which ring should you choose for your needs?
Choose the Oura Ring 5 if:
- you want the thinner and lighter of the two
- you prioritize an easy-to-read app and sleep trends
- you accept a subscription costing around €70 per year
- you prefer the manufacturer whose previous generations have the most published validation
Choose the Ultrahuman Ring Pro if:
- you refuse to pay a subscription to access essential data
- you take long trips or rarely sync your phone
- battery life matters more than thinness
- you accept buying a generation with little independent evidence so far
Keep your Ring 4 or Ring AIR if:
- it is comfortable and records complete nights
- its battery still covers several nights without worry
- the new features do not change any practical decisions
- you would rather wait for independent tests and reports on battery degradation
If none of these options fits, check our selection of subscription-free Oura alternatives, then apply the same evidence criteria.
How to use a ring without becoming a slave to the score
Good use means tracking a trend, not treating every morning’s score as a biological verdict. The most useful measurements are generally schedule consistency, sleep duration, nighttime heart rate, relative temperature and HRV compared with your own usual level.
A simple personal test could look like this:
- wear the sizing ring for at least one day and one night before choosing your size
- give the device two weeks to establish a baseline
- change just one variable for seven to fourteen days, such as the timing of your last alcoholic drink or last meal
- compare the weekly trend with your actual energy, sleepiness and performance
- stop checking daily if a poor score triggers anxiety or rigid behaviors
A consumer ring does not diagnose sleep disorders, arrhythmias or infections. Persistent symptoms, significant daytime sleepiness, palpitations or reported pauses in breathing warrant professional advice, even if the score stays green. If the data start harming your sleep, our guide to orthosomnia and tracker-related anxiety · FR offers a way to regain some distance.
Final verdict
The Oura Ring 5 currently wins for most readers primarily interested in tracking sleep and recovery. It is smaller, lighter and built on an ecosystem whose older generations are better documented. Its subscription remains an ongoing and debatable cost.
The Ultrahuman Ring Pro wins on battery life, storage and its basic pricing model. It is the most sensible choice for traveling, limiting syncing or refusing an annual toll. But its hardware advantage must not be turned into biometric superiority before independent validation.
The rational choice therefore comes down to one simple constraint: would you pay around €70 per year for a more mature app and a better scientific track record? If yes, Oura. If not, Ultrahuman, with a greater tolerance for the current uncertainty.
