Oura Ring Gen 4
Research-grade sleep and readiness tracking in a titanium ring
2013
Oulu, Finland
$349+
ouraring.com
Overview
The Oura Ring tracks sleep stages, heart rate variability, blood oxygen, skin temperature, and activity — all from a discreet titanium ring. Its Readiness Score helps users optimize recovery, exercise, and daily performance.
Why It's Notable
Used in 50+ peer-reviewed studies. NBA and UFC athletes use it. Detected early COVID symptoms in research.
How It Works
Infrared LEDs and sensors on the inner surface of the ring continuously measure heart rate, HRV, blood oxygen, skin temperature, and motion. Machine learning algorithms analyze this data to calculate Sleep, Readiness, and Activity scores.
Key Features
Team & Background
Founded by Petteri Lahtela. Team includes researchers from MIT and Stanford.
Disclaimer: This information is for educational purposes only. Health.AI does not endorse, sell, or receive compensation from any listed product. Always consult your healthcare provider before using any health technology. Product claims are based on manufacturer data and published research at the time of listing.