Circular Ring 2

Circular Ring 2｜ AI Vitamin

: Circular Health Limited
: Paris, France (registered office: 1 Rue Marguerin, 75014)

AI summary

Circular Ring 2 is a 4 g titanium wellness ring that tracks 140+ biosignals, offers ECG and wellness-only blood-pressure estimates, and pairs with free Kira AI guidance in the app without a mandatory subscription.

Pricing

Hardware options

Option	Price
Circular Ring 2	$349.00

Specifications

Key hardware details first, followed by the complete product specification.

Key specifications

Weight: 4 g; manufacturer-reported.
Ingress protection: IP68; the official Help Desk says the ring can be immersed to 50 m.
Battery life: Up to 8 days, as stated on the product page. Battery modes include Performance and Power; real use may vary.
Sensors: Single-lead ECG and PPG sensors; Circular describes using both signals to estimate blood pressure with Pulse Transit Time.

Design & carry

Materials: Titanium.
Officially listed colours: Obsidian Black, Silver, Rose Gold and Gold.

Power & charging

Charging method: One Circular Charger Case 2 is included. The product page does not state the charging method or time.
Required accessories and consumables: One Circular Charger Case 2 is included. An extra case is $39.00; the optional sizing kit is $5.00.

Capabilities & dependencies

Core task delivery status: Tracks 140+ biosignals across 14+ health features, including ECG/AFib checks, wellness blood-pressure estimates, sleep, activity, recovery and Kira AI in the Circular app.
Core task internet requirement: Circular’s terms require internet access to use its services; the product page does not specify standalone offline storage.
Phone dependency: Requires a compatible iOS or Android phone and the Circular app; the product page does not list minimum OS versions.
External dependencies: Circular app and account. Kira AI and most core features are free; premium app access applies to advanced blood-pressure and glucose estimates.

Connection & companion

Connectivity: Bluetooth connection to the Circular app; Bluetooth version is not listed on the product page.
Compatible platforms: Compatible iOS or Android phone; minimum OS versions are not listed in Circular’s terms.
Data export: ECG trace PDF export is free; premium BP/glucose feature access adds PDF export of the related history.

Sensors & metrics

Tracked metrics: 140+ biosignals across 14+ features: ECG/AFib, estimated blood pressure, heart rate, HRV, SpO₂, respiration, skin temperature, sleep, steps, workouts, calories, VO₂ max, stress, recovery, cycle tracking, vital alerts, medication reminders, guided breathing and Kira AI insights.

Privacy & data

Data retention: The support article says app history remains if a premium subscription ends; device or cloud retention duration is not published on the product page.

What is included

In the box: Circular Ring 2 and one Circular Charger Case 2. Optional sizing kit is listed at $5.00.

Support & ownership

Warranty: 1-year warranty; the official page states 2 years in the EU under local consumer law.
Warranty markets and conditions: Worldwide shipping and 14-day returns are listed on the product page; warranty is 1 year, or 2 years in the EU under local law.

Fit & wear

Sizes and fit guide: Ring sizes 6–14 (nine sizes); the page offers a 2-minute digital sizing flow or a $5.00 replica sizing kit.

Membership

Functions after membership ends: Kira AI and most app features remain free. If premium BP/glucose access ends, recorded history remains and free feature functions continue; premium trends and exports stop.

Claims & scope

Intended use: Wellness tracking. Circular says the ring is not a medical device as a whole; blood-pressure and glucose estimates are not medically certified and are not for diagnosis or treatment.

FAQ

Do I need a subscription to use my Circular Ring?

No. The ring and the large majority of the app work with no subscription at all.

Is Blood Pressure and Glucose free or paid?

Both. Measuring and seeing your score is free and unlimited. Advanced insights, long-term trends and PDF export are premium.

Is there a difference between unlocking with coins and paying by card?

No. Both give the same access to the same feature.

What happens to my data if I stop paying?

Nothing is lost. Your history stays in the app, and the free features carry on as normal. You lose access to the premium parts only.

Will more features become premium later?

The free features listed above stay free. If a new premium feature is added, Circular+ status includes it.

Where can I see what I am paying for?

In the app, under your account.