Oura faces lawsuit accusing it of misleading consumers about sleep-tracking accuracy

A proposed class-action lawsuit filed in San Francisco alleges Oura’s smart rings cannot directly measure physiological signals needed for sleep-stage assessment and instead rely on AI estimates with “a coin-flip” chance of accuracy, despite marketing claims of up to 95% sleep-staging accuracy. Oura contends its algorithms use heart rate, HRV, movement, breathing and temperature, citing peer-reviewed studies that validate its sleep-stage estimates against polysomnography, and says it will contest the allegations in court.