| Manufacturer | Ultrahuman |
|---|---|
| Type | Smart ring |
| Series | Ultrahuman Ring AIR |
| Price | $349 |
| Predecessor | Ultrahuman Ring R1 |
| Successor | Ultrahuman Ring PRO |
| Sizes | 5 to 14 |
| Subscription | None |
Specifications and features as at launch.
Expert opinion | Specifications | Battery life | Features | Further reading
Expert opinion
The Ultrahuman Ring AIR is light and generally comfortable for overnight wear, providing sleep, resting heart rate, heart rate variability, temperature and recovery trends through an app without a compulsory subscription. Extended testing found battery life typically around four to five days, below the advertised maximum. Sleep duration and resting heart rate generally compare reasonably with other wearables, but this does not establish medical-grade accuracy. Independent testers using chest straps reported substantial heart rate errors during intense exercise, although some found closer agreement in other conditions. Workout recording and synchronisation have also proved inconsistent. Its distinctive strength is combining circadian guidance, personalised caffeine timing and recovery insights without locking core data behind monthly fees.
For health-conscious users, the Ring AIR helps identify patterns in sleep, recovery and daily habits, with prompts that can support more consistent routines. Its lightweight design makes continuous monitoring less intrusive than wearing a watch overnight. However, exercise heart rate and workout analysis are unreliable enough to limit its usefulness for tracking training intensity or evaluating performance. The app also presents a dense mix of scores and advice, which can obscure the most meaningful findings. It is more capable as a sleep and general wellbeing tracker than as a serious sports monitoring device.
Specifications
| Physical | |
|---|---|
| Material | Fighter jet grade titanium with a tungsten carbide carbon coating; two-component build |
| Thickness | 2.4 mm |
| Weight | 2.4 g (your review measured about 3 g depending on size) |
| Sizes | 5 to 14 |
| Water resistance | 100 m |
| Sensors and processing | |
| Sensors | PPG, temperature, 6-axis IMU |
| Processor | Single core |
| Bluetooth | Low Energy |
| On-ring storage | 4 days |
| Calibration | Up to 14 days |
| © the5krunner. Link required. | |
| Charging | |
| Charger | Wireless charging pad |
| © the5krunner. Link required. | |
Battery life
| Item | Detail |
|---|---|
| Official battery life | 4 to 6 days |
| In your testing | Rarely more than 4 days |
| © the5krunner. Link required. | |
Features
- Sleep Index
- Skin temperature tracking
- Movement Index
- HRV and recovery insights
- Phase Response Curve circadian guidance
- Works with Ultrahuman M1 glucose data
- No subscription
Other Ultrahuman models
Compare this model with the others in the range.
Further reading
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
Reader-Powered Content
This content is not sponsored. It’s mostly me behind the labour of love, which is this site, and I appreciate everyone who supports it.
Support the site: Follow (free, fewer ads) · Subscribe (paid, ad-free) · Buy Me A Coffee
Written by real people, with AI assistance. Fact-checked and verified for originality. See the Editorial Policy. FTC: Affiliate Disclosure — some links pay commission. As an Amazon Associate, I earn from qualifying purchases.
