The Oura Ring 4 represents the pinnacle of smart ring technology with fully titanium construction and clinically validated sleep tracking accuracy. This discreet health monitor delivers comprehensive insights through 18 sensor pathways while maintaining comfortable 24/7 wearability.
Fully titanium design with PVD coating provides exceptional durability at just 3.3-5.2g weight. Available in sizes 4-15 with six color options including Black, Silver, Stealth, Brushed Silver, Gold, and Rose Gold for personalized style preferences.
Brigham and Women's Hospital study confirms the most accurate consumer sleep tracking available. 4-stage sleep classification achieves 5% better accuracy than Apple Watch and 10% better than Fitbit, with 91.7% overall sleep/wake accuracy.
18-path multi-wavelength PPG system (upgraded from 8-path) provides 7% fewer gaps in daytime heart rate data and 31% fewer gaps in nighttime tracking. Finger-based monitoring offers more stable blood flow than wrist devices.
Personalized Readiness Score combines sleep quality, HRV, resting heart rate, body temperature trends, and activity balance. Daily recommendations help optimize training intensity and recovery periods based on individual physiological data.
Advanced cycle tracking with temperature-based predictions and fertile window identification. Integration with Natural Cycles and Flo apps provides comprehensive reproductive health insights through precise temperature trend analysis.
Up to 8 days battery life with 80-minute charging time and smart power management. 100-meter water resistance supports swimming, showering, and water sports while maintaining accurate health monitoring throughout.
| Feature | Details |
|---|---|
| Material | Fully titanium with PVD coating |
| Dimensions | 7.9mm wide, 2.88mm thick |
| Weight | 3.3-5.2g (varies by size) |
| Sizes | 4-15 (expanded range) |
| Battery | 8 days, 80 minutes charging |
| Water Resistance | 100 meters |
| Sensors | 18-path PPG, temperature, accelerometer |
The Oura Ring 4 excels as the ultimate discreet health monitor for users prioritizing sleep tracking accuracy and recovery insights. While the subscription model adds ongoing costs, the clinically validated monitoring, premium titanium construction, and comfortable 24/7 wearability make it ideal for health-conscious individuals seeking comprehensive wellness data without smartwatch bulk.