Circular Ring 2
Smart ring designed by a French startup, featuring sleep tracking and an integrated assistant.
- What it is
- Smart ring designed by a French startup, featuring sleep tracking and an integrated assistant.
- Best for
- Sleep tracking · Activity measurement · Heart rate analysis
- Platforms
- iOS · Android
Strengths
- Designed by a French startup
- Integrated assistant
Weak points
- Company status and pricing to be verified
- Availability in Canada to be verified
What is Circular Ring 2?
The Circular Ring 2 is a smart ring designed for daily health and activity tracking. Made of titanium with a hypoallergenic interior, it contains various sensors that measure physiological data continuously, such as heart rate, blood oxygen levels, and heart rate variability.
At a glance
- Type
- Smart ring
- Platforms
- iOS, Android
- Subscription required
- No
- Free trial
- No
- French
- Yes
- Availability
- France, Canada, Belgium, Switzerland, Worldwide
- Uses AI
- Yes
- Evidence level
- No known evidence
This information is indicative and may change: only the publisher's own website is authoritative.
What the AI does: The product includes Kira, an AI coach that analyzes over 140 biomarkers to provide personalized recommendations and interpret data in natural language.
Who uses Circular Ring 2?
iOS and Android users
The device is compatible with smartphones running iOS 15 or later and Android.
Active individuals
Designed for continuous wear, it is suitable for users wishing to track their fitness and recovery indicators.
Key features
Health sensors
The ring includes an ECG sensor for on-demand measurements, as well as blood pressure, SpO2, and temperature monitoring.
Activity tracking
It automatically records steps, calories burned, active minutes, and heart rate zones.
Sleep analysis
The tool offers an analysis of sleep cycles, including four stages, as well as a rest and energy score.
Water resistance
The device is certified for water resistance up to 50 meters, allowing for use in the shower or swimming pool.
Pricing
US$299.00 in the United States; there is no separate Canadian store.
Pricing recorded on November 1, 2026. Excluding taxes and shipping. Prices change: the amount that applies is the one shown by the publisher's own checkout.
One-time purchase
US$299.00
The price may vary based on the selected color.
- Access to main features
- No mandatory subscription
- One-year warranty
The business model is based on a one-time purchase without a mandatory subscription for basic features. Some advanced options may be unlocked via credits earned through regular use of the ring.
Use cases
Recovery tracking
The ring measures heart rate variability to establish a daily baseline.
Outcome: Helps the user evaluate their fatigue and recovery levels.
ECG recording
The user can trigger a 40-second ECG reading at any time via the application.
Outcome: Provides a point-in-time measurement of the heart rhythm.
How it works in practice
Initial setup
- 1Select your size via the provided measurement kit
- 2Synchronize the ring with the mobile application
- 3Calibrate the blood pressure measurement with a standard blood pressure monitor
Charging the device
- 1Place the ring on the dedicated charging dock
- 2Connect the dock using the provided USB-C cable
In your daily routine
Mobile ecosystem
The dedicated app centralizes data and provides recommendations from the Kira virtual assistant.
Known limits
Non-medical use
The device is intended for wellness tracking and is not a medical device or a diagnostic tool.
Measurement accuracy
Movement during ECG measurements can cause signal noise, requiring the user to remain still.
Consider something else if
- Users seeking a medical diagnostic device
- Individuals requiring integration with unsupported specific health ecosystems
How to use it
Wearing the ring
The ring must be worn on the finger to ensure constant contact between the sensors and the skin.
Viewing data
Measurements are transmitted via Bluetooth to the mobile application for viewing and historical logging.
Frequently asked questions
Does the ring require a subscription?+
No, main features are included with the purchase of the ring.
What is the battery life?+
The battery can last up to seven days depending on the use of live measurements and ECGs.
Is it possible to swim with the ring?+
Yes, it is water-resistant up to 50 meters, allowing for swimming in pools or open water.
How do I determine my size?+
The manufacturer offers a sizing kit consisting of dummy rings to test the size before purchase.
What materials are used?+
The ring is made of titanium on the outside and a biocompatible epoxy material on the inside.
Sources
Evidence level shown: No known evidence
The manufacturer states that the device is not a medical device and that measurements are wellness estimates.
No published source specific to this product has been identified so far.
Background on the approach
General references on the category or technology: they do not cover this specific product.
These references cover the approach or technology, not an evaluation of the product by us. None of these links is an affiliate link. Read our method.
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