Review · Health & fitness
Wellue O2Ring review
A ring-style overnight oxygen monitor that logs SpO2 and pulse and vibrates when readings cross thresholds you set.
By the HearSmart research desk · Updated November 9, 2026
- Performance (40%)
- 7.2
- Ease of use (25%)
- 8.5
- Value (35%)
- 8.6
The Wellue O2Ring is not a lifestyle smart ring, but it belongs here for people whose sleep worry is breathing. It is a continuous pulse oximeter worn on the finger overnight, logging blood oxygen, pulse rate and motion, and Wellue's app shows the data in real time on iOS and Android at no subscription cost. You can set custom low oxygen and abnormal pulse thresholds, and the ring vibrates on your finger when readings fall outside them, with five vibration levels from a gentle nudge to a wake-up. Wellue pitches this for CPAP users catching mask leaks and for people turning off their back. In the morning, PC and Mac software summarize oxygen drops, time spent low and a nightly Oxygen Score, with PDF and CSV export for a doctor. The O2Ring costs $159 and the O2Ring S $199. Battery lasts up to 16 hours, and it does not report sleep stages.
Who it is for
People who want overnight oxygen and pulse reports to share with a doctor, or CPAP users checking their therapy.
Price
$159 for the O2Ring at Wellue; O2Ring S $199; no subscription for app features.
Choose your model O2Ring $159.00
Quoted from the vendor pricing page on November 9, 2026.
Key features
- Continuous overnight blood oxygen and pulse rate
- Vibration alerts at custom low oxygen and pulse thresholds, with 5 levels
- Free iOS and Android app with real-time data
- PC and Mac software with Oxygen Score and oxygen drop summaries
- PDF and CSV report export
Strengths and weaknesses
- Strength: Cheapest device on the list at $159
- Strength: Reports are designed to share with a doctor
- Strength: No subscription for the app features
- Weakness: Up to 16 hours of battery, so it needs charging every day
- Weakness: Focuses on oxygen, pulse and motion rather than sleep stages
- Weakness: Bulkier than a smart ring at 15g
Key facts
- Price: $159 (O2Ring S $199)
- Battery: Up to 16 hours
- Data: Logged every 4 seconds
- Fit: Finger circumference 55 to 80mm
- Weight: 15g
Where it ranks
Wellue O2Ring is No. 8 in our Best Smart Rings verdict.
Alternatives we scored
Visit getwellue.com · Questions or corrections: editorial@hearsmart.org