A proposed class-action lawsuit filed in California accuses Oura of deceptive advertising over its smart ring sleep tracking. The complaint alleges the wearables cannot measure brain activity or sleep stages directly, relying instead on AI-generated estimates. Oura disputes the allegations, defending its reliance on established physiological signals.
Smart ring maker Oura is facing a proposed class-action lawsuit in federal court over claims that its wearables cannot accurately track sleep stages or measure sleep quality as advertised. Filed on August 20 in the U.S. District Court for the Northern District of California, the lawsuit targets the company’s marketing claims regarding sleep-staging accuracy, including statements displayed on product pages comparing its technology to clinical sleep laboratories.
The complaint was filed by the Clarkson Law Firm on behalf of named plaintiff Madison Surber, a California resident who purchased an Oura Ring 4 Gold for $513.68 through the company’s website around May 22, 2025. According to legal filings, the action asserts a class of more than 100 members with an amount in controversy exceeding $5 million.
Core Allegations and the Debate Over Sleep Tracking Accuracy
The lawsuit focuses on what it characterizes as a fundamental limitation of wearable technology worn on the finger. Because sleep physiology is anchored in brain activity, the complaint argues that Oura rings are unable to measure electrical signals from the scalp, eye movements, or muscle tone required for precise clinical assessment.
“Instead, Oura’s AI models are doing guesswork as to what may be happening, based on improper inputs, and thus taking advantage of desperate consumers who struggle with their sleep or are concerned for their health by selling faulty AI-based inference as reliable science.”
Photo: Techcrunch
Class action complaint, via Mashable
According to USA Today, the lawsuit points out that Oura markets its devices to millions of users who check morning sleep scores ranging from 0 to 100, alongside breakdowns for deep sleep, REM sleep, and light sleep. While Oura acknowledges in product literature that its rings cannot replicate a hospital laboratory setting, the suit alleges that this disclosure is buried in technical documentation while prominent marketing promotes high accuracy figures.
Legal representatives for the plaintiffs argue that consumers rely heavily on these metrics to manage their daily lives and health decisions. When people rely on a device to guide decisions about their health, misinformation cannot be tolerated, said Ryan Clarkson, co-founder and managing partner at Clarkson Law Firm, highlighting that users structure their days and interpret their well-being around the figures generated by the ring.
Oura’s Defense and Scientific Standing
Oura has strongly disputed the claims, emphasizing that its sleep-staging methodology relies on valid physiological markers.
“We stand behind our science, research, and accuracy claims. Like other consumer sleep wearables, Oura Ring estimates sleep stages using multiple physiological signals, including heart rate, heart rate variability, movement, breathing patterns, and temperature.”
Oura spokesperson
Legal Claims and Potential Market Impact
The lawsuit alleges Oura engaged in fraudulent advertising, unjust enrichment, breach of express and implied warranties, and violations of California’s Unfair Competition Law, False Advertising Law, and Consumers’ Legal Remedies Act.
The legal action asks the court for injunctive relief to halt allegedly fraudulent advertising and marketing of Oura rings, and potentially to halt their sale, as well as restitution for buyers.
The case remains in its preliminary stages.
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