Versus Engine
Circular Ring 2 vs Oura Ring Gen 3
Specs, price and the one trade-off that actually decides it — Circular Ring 2 against Oura Ring Gen 3, side by side.
Cheaper to start
Tie
Both start at a similar price.
Rated higher
Oura Ring Gen 3
9.5 vs 8.8 on our design scale.
Standout
Circular Ring 2
Native ECG sensor for AFib detection
Circular Ring 2
A smart ring with native ECG and no subscription, aimed at the European market.
Where it wins, where it doesn't
Pros
- Native ECG sensor for AFib detection
- No subscription — a saving that compounds over years
- Haptic notifications on the ring itself
Cons
- Finish and industrial design trail the Oura Ring 4
- Data interpretation less mature than Oura's
- Global support network still being established
Specifications
- Battery8 days power mode, 5 days performance
- SensorsECG, PPG, temperature, 3-axis accelerometer
- Weight3 g
- Blood Oxygen (SpO2) Sensing—
- Charging30 minutes, wireless case
- ComplianceGDPR and HIPAA
- connectivity—
- Daytime Heart Rate—
- Improved Sleep Staging—
- MaterialTitanium, hypoallergenic interior
- materials—
- New Library of Wellness Content—
- Period Prediction—
- Size2.55 mm thick, 7.8 mm wide, 3 g
- SizesUS 6-14
- temperature_precision—
- Thickness2.55 mm
- Water ratingIP68
- water_resistance—
- Workout Heart Rate—
Oura Ring Gen 3
The finger-worn tracker that made continuous health monitoring socially wearable — with a subscription attached.
Where it wins, where it doesn't
Pros
- Finger-based PPG provides drastically clearer signals than wrist trackers
- NTC thermistors track illness onset via 0.1°C temperature variance
- Titanium shell withstands deep water and extreme elements
Cons
- Full data access locked behind a mandatory monthly subscription
- Bulky form factor on smaller hands
- Lacks real-time vibration or notification haptics
Specifications
- Battery15mAh to 22mAh Lipo (Up to 7 days)
- SensorsRed/Green/IR PPG, NTC temperature, 3D accelerometer
- Weight4g to 6g
- Blood Oxygen (SpO2) SensingPowered by a new red LED sensor in Gen3
- Charging—
- Compliance—
- connectivityBluetooth Low Energy (BLE)
- Daytime Heart RatePowered by a new suite of green LED sensors in Gen3 only
- Improved Sleep StagingEnhanced sleep accuracy, closely matching the gold standard sleep lab test
- Material—
- materialsTitanium shell with PVD coating, non-allergenic inner molding
- New Library of Wellness ContentProduced alongside world-renowned experts
- Period PredictionAvailable on Gen3 only
- Size—
- Sizes—
- temperature_precision0.1°C variance detection
- Thickness—
- Water rating—
- water_resistanceUp to 100 meters (10 ATM)
- Workout Heart RateAlso powered by a new suite of green LED sensors in Gen3 only