Get 40$/40€ OFF + Free 6 Month's Membership Instantly when purchasing your Oura Ring! 5/5 Avaliable | October 2023 Oura Ring (stylized Ōura), is a smart ring used to track sleep and physical activities. It uses advanced sensor technology and an app to deliver precise and personalized information to its users. The ring tracks sleep duration, sleep quality, sleep stages (Deep, REM and Light), Heart Rate, Heart Rate Variability (HRV) and body temperature and delivers a sleep and readiness score to monitor your recovery.