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Clinical / medical-grade · Ring · by Wellue
Wellue O2Ring
An FDA-cleared continuous-SpO2 ring for overnight oxygen tracking — free PDF/CSV reports and no subscription.
2020Wellue O2Ring
Late in cycle6 yr 5 mo old
API access: No Raw data access: Yes — open Open source: Community
Clinical value
70/100
FDA-cleared continuous SpO2
Empowerment
76/100
Free PDF/CSV reports, no lock-in
Everyday value
52/100
Overnight wear, single-purpose
A wearable ring pulse oximeter with a genuine FDA clearance that logs overnight blood oxygen and pulse, vibrating when levels drop — strong on data portability and screening value, though single-purpose. Unlike many "aviation/sports" rings, this one is actually cleared.
What it measures
Continuous overnight SpO2 and pulse rate (4-second logging) via a reflectance sensor, with a silent vibration alert when SpO2 or pulse cross set thresholds.
Regulatory status
FDA 510(k)-cleared (Checkme O2, K191088; a smart-ring oximeter clearance K242876 followed in Feb 2025) for spot-check and continuous data collection — not real-time alarm/telemetry monitoring. Verify the specific SKU maps to the cleared model.
Validation & accuracy
SpO2 accuracy validated to ±2% (70–100%) per the clearance; standard pulse-oximeter skin-tone caveats apply. Suitable for nocturnal-hypoxemia / sleep-apnea screening, not a diagnostic sleep study.
Data control & export
Raw data: open — the app and free PC software generate PDF and CSV reports for clinician sharing, with on-device storage and offline download. API: none, but local export is unusually open.
Wearability & battery
A soft ring worn mainly overnight; battery lasts a full night and recharges quickly. Single-purpose, screenless.
Cost & access
One-time ~$150–$170. No subscription — all reports and exports are free.
Who it serves
People screening for nocturnal low oxygen (sleep apnea, COPD) who want clinically credible data they can export and share cheaply.
Who is left out or burdened
Single-purpose SpO2 device; cleared for data collection, not real-time alarms; oximeter skin-tone caveats apply.
✓ Strengths
- Genuine FDA clearance (unlike many "sports/aviation" rings)
- Free PDF and CSV reports; on-device storage
- No subscription; inexpensive
- Vibration alerts for low overnight oxygen
✕ Weaknesses
- Single-purpose SpO2/pulse device
- Cleared for data collection, not real-time alarms
- Pulse-oximeter skin-tone accuracy caveats
- Clearance is SKU-dependent — verify the model
70
Why this clinical score. A genuine FDA clearance with validated ±2% accuracy and real screening value puts it well up the clinical axis; single-purpose and not a diagnostic study keep it below multi-metric medical devices.
76
Why this empowerment score. Free PDF and CSV reports, on-device storage, offline download, and no subscription make it strongly patient-empowering despite the lack of an API.
52
Why this everyday score. Comfortable for overnight wear and effortless to recharge, but single-purpose and screenless.
Latest news
Reviews & coverage
Reviewers and sleep-apnea communities like the O2Ring as an affordable overnight SpO2 and pulse recorder with vibration alerts. It's a screening aid, not a diagnostic — reviewers stress confirming findings with a real sleep study.
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.