#1 · Fitness Trackers
Oura Ring 4
Oura
90.7/ 100 · n=95 reviews
High confidence · 5 sourcesClear winner — +9.7 pts over #2
Oura's smart ring tracks sleep, activity, stress, heart health and cycle insights from your finger, using an 18-path multi-wavelength PPG Smart Sensing system housed in a seamless, lightweight titanium body with no screen — all data is viewed in the companion app.
Specifications
- Display
- None — data viewed via iOS/Android app
- Battery
- Up to 8 days (5–8 days typical); full charge in up to 120 minutes
- Sensors
- 18-path multi-wavelength PPG (red, infrared and green LEDs), digital temperature sensor, accelerometer
- Health tracking
- Sleep stages, resting heart rate, HRV, blood oxygen (SpO2), respiratory rate, temperature trends, stress, readiness and cycle insights
- GPS
- No built-in GPS
- Water resistance
- Water resistant to 100 m (328 ft)
- Weight
- 3.3–5.2 g depending on ring size
- Material
- Titanium (interior and exterior); Oura Ring 4 Ceramic uses zirconia ceramic
- Sizes
- Available in sizes 4–15
- Data storage
- Stores up to two weeks of data