Oura, a smart ring manufacturer, is facing a proposed class action lawsuit filed on August 21, 2026, by Clarkson Law Firm on behalf of Madison Surber, a California resident. Surber claims she purchased an Oura Ring 4 for approximately $514 in May 2025 and alleges that the device misrepresents its ability to accurately track sleep stages. The lawsuit contends that the ring lacks the necessary sensors to detect biological signals associated with sleep stages, relying instead on a machine-learning model that estimates sleep data based on heart rate, movement, and skin temperature, which the complaint describes as having a low accuracy rate.
The complaint includes user testimonials from a Facebook group and the Oura subreddit, where customers reported discrepancies between their actual sleep experiences and the app's assessments. Oura has publicly rejected these allegations, stating its intention to defend against the claims. The lawsuit argues that Oura's marketing suggests the ring can perform functions typically reserved for clinical sleep studies, such as identifying different sleep stages. The complaint requests that the court order Oura to cease misleading advertising and provide restitution to affected customers.