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Recovery / wellness · Ring · by Circular
Circular Ring 2
A feature-packed startup ring that markets an on-demand ECG and AFib — but the FDA clearance is unverified and features have slipped.
August 2025Circular Ring 2
Fresh in cycle10 mo old
API access: No Raw data access: Yes — restricted Open source: No public repo
Clinical value
28/100
Marketed ECG, clearance unverified
Empowerment
46/100
Freemium, limited export
Everyday value
55/100
Ambitious, but startup reliability
An ambitious smart ring marketing on-demand ECG, AFib detection and an AI coach, but its "FDA-cleared AFib" claim could not be independently verified and several promised features (BP, glucose) have slipped. Treat as a wellness device.
What it measures
24/7 heart rate and HRV, SpO2, skin temperature, sleep stages and breathing rate, sport/GPS activity, stress, cycle tracking, an on-demand ECG, and an AI coach. Blood-pressure and glucose trends are roadmap, not shipping.
Regulatory status
Marketed as "clinical-level ECG and FDA-cleared AFib," but the clearance was not independently confirmed (no verified FDA record) and the ECG was not fully shipping at launch. Treat as wellness-only.
Validation & accuracy
No independent validation studies; marketing-only, with user reports of delayed or missing promised features.
Data control & export
Raw data: restricted — syncs to Apple Health, but no documented CSV export. API: none documented.
Wearability & battery
Titanium ring with an AI coach and on-demand ECG ambitions; ~$349 and several-day battery. Startup with a history of shipping delays.
Cost & access
One-time ~$349–$549 by finish. Subscription-free core, with a "Circular Coins" freemium model to unlock some future premium features.
Who it serves
Early adopters who want the most feature-laden ring on paper; not suitable for anyone relying on cleared cardiac monitoring.
Who is left out or burdened
Unverified medical claims; delayed features; small startup with reliability and longevity risk; no open export.
✓ Strengths
- Broadest feature set on paper (ECG, AI coach, sport)
- Subscription-free core experience
- Apple Health sync
- Frequent firmware/feature updates
✕ Weaknesses
- "FDA-cleared AFib" claim unverified
- Promised BP/glucose features delayed or absent
- No CSV export or developer API
- Small startup — reliability and longevity risk
28
Why this clinical score. The headline ECG/AFib clearance is unverified and features have slipped, so it scores as wellness-only — the lowest clinical tier.
46
Why this empowerment score. Subscription-free in principle, but a freemium coin model, Apple-Health-only data egress, and no API or CSV cap the empowerment score.
55
Why this everyday score. Feature-rich on paper with an AI coach and ECG ambitions, but startup reliability and delayed features temper the everyday experience.
Latest news
Reviews & coverage
Coverage is cautiously positive on features (AFib screening ambitions, no subscription) but flags early-firmware bugs and inconsistent data as growing pains. Reviewers advise watching how the software matures before relying on it.
Summary is a draft synthesis of public coverage, not an endorsement. Links open a search of each outlet.
Reddit communities
Independent user communities where this device (or its category) is discussed.
Get it · manuals & support
Draft profile · public-source review, June 2026 · scores describe direction and degree, not buying advice. News, links, and prices change — verify with the manufacturer. Image is representative.