Circular Ring 3 comes in two models: Ring 3 Pro and Ring 3 Slim. Both track sleep, activity, heart rate, temperature and recovery, with no subscription.
The Pro adds medical-grade features (ECG, AFib detection, blood pressure), vibrations on your finger and contactless payment.
The Slim is thinner and lighter and focuses on everyday health tracking with contactless payment.
Pre-orders open in January 2027. Prices will be announced at launch.
Pro vs Slim at a glance
| Ring 3 Pro | Ring 3 Slim | |
|---|---|---|
| Sensors | 1-lead ECG, dual-LED red, infrared, green PPG (heart metrics), skin temperature, 6-axis accelerometer | PPG (heart metrics), skin temperature, 6-axis accelerometer |
| ECG and AFib detection | Yes (FDA-cleared AFib detection) | No |
| Blood pressure | Yes, with cuff calibration | No |
| Glucose | Coming later, via a future update (non-invasive estimation) | Coming later, via a future update (non-invasive estimation) |
| Vibrations (haptics) | Yes | No |
| Contactless payment (Circular Pay, NFC) | Yes | Yes |
| Battery life | Up to 12 days | Up to 10 days |
| Charging time | About 50 min | About 30 min |
| Charging case | 700 mAh, 5 to 6 full ring charges | 700 mAh, 9 to 10 full ring charges |
| Thickness x width | 2.78 mm x 6.8 mm | 2.35 mm x 5.8 mm |
| Weight | 3 to 4 g (depending on size) | 1.9 to 3 g (depending on size) |
| Water resistance | 50 m | 50 m |
| Sizes | US 6 to 14 | US 6 to 14 |
| Material | Premium titanium outside, hypoallergenic inner-side | Premium Titanium on the outside and inside |
| Colors | Gold, Rose Gold, Silver, Anthracite Black | Gold, Rose Gold, Silver, Anthracite Black |
| Subscription | Only for premium unlock | Only for premium unlock |
Which one is right for me?
Choose Ring 3 Pro if you want:
- ECG readings and AFib detection
- Blood pressure tracking
- Vibration alerts on your finger (for example smart alarm, medication reminders, vital alerts, guided breathing)
- To pay contactless with your ring
- The longest battery life (up to 12 days)
Choose Ring 3 Slim if you want:
- The thinnest, lightest ring for all-day comfort
- Sleep, activity, heart rate, temperature and recovery tracking
- To pay contactless with your ring
- Faster charging and more charges per case
Good to know: the Slim has no vibration motor, so features that make the ring vibrate (such as the smart alarm or medication reminders) are done through the phone's vibration or alarm.
FAQ
Can I use Ring 3 Slim for ECG or blood pressure?
No. ECG, AFib detection and blood pressure need sensors that only Ring 3 Pro has.
Do I need a subscription?
No. Core features are included with both models, with no monthly fee.
Can I swim with Ring 3?
Yes. Both models are waterproof to 50 m.
Can I still buy Ring 2?
Yes. Circular Ring 2 remains on sale until Ring 3 is officially released.
Still have questions? Contact us at https://www.circular.xyz/contact-us