Circular Ring 2
Smart ring · iOS and Android
- Cheapest price
- £280
- Subscription
- None
- Over 3 years
- £280
Prices
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What it measures
- Heart rate
- Resting heart rate
- HRV
- Sleep stages
- Deep sleep
- Blood oxygen
- Breathing rate
- Skin temperature
- Readiness score
- Steps
- ECG
- GPS (no)
- Blood pressure
- Cycle tracking
As shop.circular-ring.com states it.
What it does
A titanium smart ring with no screen and no vibration motor that carries both an ECG and a PPG sensor. It records a single-lead ECG when you touch it for about forty seconds, estimates blood pressure from the timing between its two sensors after calibration with a home cuff, and tracks sleep, heart rate and temperature in its app.
From the description on shop.circular-ring.com.
Circular Ring 2 specs
- Type
- Smart ring
- Works with
- iOS and Android
- Battery
- 8 days in power mode, about 5 in performance mode (maker's claim)
- Water resistance
- IP68
- Medical features
- ECG AFib classification "by an algorithm cleared by the FDA" (maker's page; UK status not stated)
- Thickness
- 2.55 mm
- Width
- 7.8 mm
- Weight
- 4 g
- Body
- Titanium with a PVD finish, hypoallergenic interior
- Sizes
- US 6 to 14 (nine sizes)
- Finishes
- Four
- Sensors
- ECG, PPG, temperature, 3-axis accelerometer
- Connectivity
- Bluetooth Low Energy, airplane mode
- Charging
- Wireless charging case; 30 minutes
- Reading interval
- Readings update roughly every two minutes
- Warranty
- 1 year
Further specs from shop.circular-ring.com.
How it compares
- To buy, it is the 5th cheapest of 8 smart rings we compare (the middle one costs £279.65).
- Over three years, subscription included, it is the 3rd cheapest of 8 smart rings.
- It measures 7 of the 8 features we compare; the middle smart ring measures 5.
- Has what fewer than half of them do: ECG, Blood pressure.
- It needs no subscription; 3 of the 8 do.
Circular Ring 2 reviews and discussions
Reviews
- TechRadar review of the Circular Ring 2
- Tech Advisor review of the Circular Ring 2
- Android Central review of the Circular Ring 2
Which?
- Which? tests of this kind of product members' content
Links to other sites' reviews and discussions; we do not run them and they are not ours.
Questions
- Where is the Circular Ring 2 cheapest?
- Circular, at £280 when checked on 2026-10-29.
- Does the Circular Ring 2 need a subscription?
- No subscription.
- What does the Circular Ring 2 cost over three years?
- £280, the price plus any required subscription.
- How does the Circular Ring 2 compare with other smart rings?
- To buy, it is the 5th cheapest of 8 smart rings we compare (the middle one costs £279.65). Over three years, subscription included, it is the 3rd cheapest of 8 smart rings. It measures 7 of the 8 features we compare; the middle smart ring measures 5.
Compare with
- 1
- 3 years
- £149.90
- Price
- £149.90
- Subscription
- Optional
- 2
- 3 years
- £246.75
- Price
- £246.75
- Subscription
- Optional
- 3
- 3 years
- £399
- Price
- £399
- Subscription
- None
Readings are not a diagnosis. If you are worried about your health, speak to your GP, pharmacist or NHS 111. How we earn.