A group of scientists recently conducted a study comparing the accuracy of tracking sleep in three popular wearable devices: the OURA Ring Gen3, the Apple Watch Series 8, and the Fitbit Sense 2.
Thirty-five volunteers participated in the experiment, with results being compared to polysomnography data, considered the gold standard of sleep evaluation. The research revealed that the OURA Ring Gen3 proved to be the most accurate device for measuring sleep parameters, exhibiting 5% greater accuracy compared to the Apple Watch Series 8 and surpassing the Fitbit Sense 2 by 10%.
The OURA Ring was found to most sensitively determine the stages of sleep and wakefulness, placing Fitbit Sense 2 in second place, with the Apple smartwatch coming in third. The study noted that the OURA Ring’s indicators closely matched polysomnography data for quick and slow sleep phases and wakefulness periods. In contrast, the Apple Watch underestimated deep sleep duration by 43 minutes and overestimated light sleep by 45 minutes.
Although the study was led by Dr. Rebecca Robbins, a medical advisor to OURA, and funded by the smart ring manufacturer, the results have been corroborated by independent research. A larger study published in the journal Jmir Mhealth and Uhealth compared 11 different devices, reaffirming that the OURA Ring Gen3 remains the most accurate for tracking sleep, followed by the Fitbit Sense 2.
The additional functions of the OURA ring, including body temperature and circadian rhythm tracking, contribute to its superior accuracy in determining sleep stages. It is essential to note that while Fitbit and Apple Watch also monitor health and activity, OURA focuses primarily on health monitoring.
With over 2.5 million devices sold, OURA remains a leader in the smart ring industry. The company recently introduced its latest model, the OURA Ring 4, touted as the “most personalized smart ring.”
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