Ring PRO and Ring AIR, the Recovery Score, Sleep Index and Movement Index — which signals feed each one, what Ultrahuman does and does not publish, and where the numbers fall short.
Ultrahuman Ring is a finger-worn wearable family for sleep, recovery and movement tracking. Ring PRO is the newest model and Ultrahuman's lead ring (currently on pre-order); Ring AIR is the thinner, simpler alternative. Both combine a temperature sensor, a PPG (photoplethysmography) sensor and a 6-axis motion sensor, and both feed the same Ultrahuman scores. Like other smart rings, they read the pulse from the finger rather than the wrist, where blood vessels near the skin give the optical sensor a stronger signal.
| Model | Ring PRO (primary model) | Ring AIR (alternative) |
|---|---|---|
| Status | Pre-order | Available outside the US |
| Battery life | Up to 15 days (up to 45 days with the PRO Charging Case) | 4–6 days |
| Sensors | Temperature, redesigned PPG, 6-axis IMU | Temperature, PPG, 6-axis IMU |
| Processor | Dual-core with on-chip machine learning | Single-core |
| On-ring storage | Up to 250 days of data | 4 days of data |
| Thickness | 2.65 mm (varies by size) | 2.4 mm |
| Charger | PRO Charging Case (magnetic) | Wireless charging pad |
Specs from Ultrahuman's own Ring AIR vs Ring PRO comparison, checked 29 September 2026.
Ultrahuman Ring — Ring PRO, with Ring AIR as the alternative — measures HRV, resting heart rate, skin temperature, sleep stages and a Recovery Score: the signals explained on this page.
See Ring PRO See Ring AIRAffiliate links. Ring PRO is currently on pre-order. Ring AIR is not offered in Ultrahuman's US store — from the US, the Ring AIR link shows Ring PRO instead.
The Recovery Score is Ultrahuman's daily readiness composite — the equivalent of Oura's Readiness score or Whoop's Recovery. Ultrahuman describes it as dynamic: the ring tracks recovery markers through the day, so the score can move after waking rather than staying fixed from the morning reading.
| Input named by Ultrahuman | What it reflects |
|---|---|
| Skin temperature | Deviation from your usual range — often an early sign of illness, heavy training or alcohol |
| Resting heart rate | Cardiovascular load; an elevated RHR usually signals incomplete recovery |
| Heart rate variability | Autonomic balance; lower-than-usual HRV typically pulls the score down |
| Stress Rhythm | Ultrahuman's own stress-tracking metric |
Ultrahuman lists these as examples (“among others”) and does not publish the weighting. That makes the score useful as a personal trend, but not directly comparable with Oura Readiness or Whoop Recovery — see the Readiness Score guide for how the brands differ.
The Sleep Index is Ultrahuman's single summary of the night. According to Ultrahuman, it assesses total sleep duration, resting heart rate and restfulness. Sleep is also split into REM, Deep and Light stages, inferred from heart and motion signals rather than brainwaves — useful for trends, but not equivalent to clinical EEG staging. See Deep Sleep and REM Sleep for normal ranges.
The Movement Index tracks how much and how regularly you move through the day, including steps and calories burned. Ultrahuman frames it around staying active outside workouts — non-exercise movement — rather than training volume alone.
Each of these metric guides has an Ultrahuman Ring entry in its “How each device measures this” section, next to Oura, Whoop, Garmin and Apple Watch: