Circular
Circular Ring Slim Smart Ring
French smart ring brand. 2.2mm thickness, 2g weight, no subscription, 5-8 day battery, surface temperature + RGB+IR PPG sensors. Niche alternative to Oura.
By Editorial team1 min read
- Brand
- Circular (French company)
- Thickness
- 2.2 mm (slimmest in category)
- Weight
- 2 g
- Sensors
- Infrared + red + green PPG LEDs, surface temperature, 3-axis accelerometer
- Battery life (claimed)
- 5-8 days
- Battery life (real-world)
- 3-5 days typical in published reviews
- Charging time
- ~45 minutes
- Subscription required
- No
- Water resistance
- 5 ATM (shower OK; not formally swim-rated like Oura/Ultrahuman)
- App ecosystem
- Circular app (iOS + Android)
- UK shipping
- Yes - global shipping from France
- UK warranty support
- Via Circular direct (France-based, slower than UK-based brands)
- Price (UK)
- £225