Oura
Screenless smart rings focused on sleep, recovery, stress, temperature, cardiovascular trends, and daily readiness.
What they're known for
A low-friction wearable built around overnight sensing from the finger, where comfort and multi-night battery life make continuous sleep data easier to collect.
Oura Ring 4 uses optical heart-rate sensors, temperature sensing, movement, and blood-oxygen measurements to generate Sleep, Readiness, Activity, and stress insights through the Oura app. Its sleep model estimates awake, light, deep, and REM stages while tracking timing, latency, resting heart rate, HRV, respiration, and temperature trends. The ring format removes the screen and most of the interaction from the hardware itself, making it particularly suited to continuous overnight tracking rather than notification-heavy smartwatch use.
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Sources
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