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The lawsuit, filed Thursday in California, alleges Oura's sleep-stage estimates are no better than a coin flip despite claims of 95% accuracy
Oura Health is facing a proposed class-action lawsuit alleging that its smart ring cannot accurately measure sleep quality or identify sleep stages, despite marketing that claims otherwise.
The complaint was filed Thursday in U.S. District Court in California by Clarkson Law Firm on behalf of Madison Surber, a California resident who paid $513.68 for an Oura ring in 2025. According to Shireen Clarkson, co-founder of Clarkson Law Firm, Oura represented to consumers that its rings could identify sleep stages with 95% accuracy relative to clinical sleep labs, while the true figure is nearer to 50%.
Shireen Clarkson described the device's operation this way: "What the ring does is, it sits on your finger, and it measures heart rate and skin temperature and body movement, and the algorithm spits out an estimate based on those signals about what your sleep stages are. People are relying on this information for their health, and I think that's where the danger lies."
