Wellue O2Ring review

The Wellue O2Ring is the pick for anyone who wants to know what happens to their oxygen level while they sleep. Instead of a clip, it is a ring sensor that Wellue says stays on during the night, powers on when worn, and logs oxygen, pulse and motion for up to 16 hours per charge. If readings cross thresholds you set, it vibrates on your finger at one of 5 strengths, and the phone can sound an alert when connected. The free app and PC or Mac software show oxygen drops and time spent low and export PDF or CSV reports, with no subscription. That makes it a common companion for CPAP users, who Wellue says can spot mask leaks from brief drops. The limits: Wellue labels it a general wellness device not intended for medical use, the original model charges over Micro-USB, and at $159.00 it costs far more than a basic spot checker.

Who it is for

overnight oxygen tracking and CPAP users

Price

$159.00 one-time for the O2Ring; O2Ring S costs $199.00.

O2Ring $159.00 Original
Quoted from the vendor pricing page on November 14, 2026.

Key features

• Ring sensor worn on the finger overnight instead of a clip-on duckbill sensor
• Vibration alert with 5 adjustable levels when oxygen or pulse leave a range you set
• Up to 16 hours per charge and memory for 4 sessions of up to 10 hours each
• Free iOS and Android app plus PC and Mac software with PDF and CSV report export, no subscription
• Fits finger circumference of 55 to 80 mm, IP22 dust and water resistance

Strengths and weaknesses

• Strength: Records continuously through the night, which no fingertip clip on this list is built to do
• Strength: Reports export as PDF or CSV to share with a doctor at no extra cost
• Strength: O2Ring S upgrade at $199.00 adds 24 hour battery life, 1 second logging and USB-C
• Weakness: Wellue says it is for general wellness use only and not intended for medical use
• Weakness: $159.00 is more than five of the fingertip models on this list
• Weakness: Charges over Micro-USB on the original model

Key facts

• Type: Ring, continuous
• Battery: Rechargeable, up to 16 hours
• Memory: 4 sessions, up to 10 hours each
• Alerts: Vibration, 5 levels
• Price: $159.00

Where it ranks

Wellue O2Ring is No. 2 in our Best Pulse Oximeters verdict.