Oura Ring 5 Scientific Review (1 Month Of Data)
In a Nutshell
Oura Ring 5 delivers exceptional nighttime heart rate and HRV tracking that matches ECG chest straps, but sleep stage accuracy dropped to second-tier performance (70% average sensitivity) versus Ring 4's first-tier results, with REM detection at only 57% agreement against EEG reference. Exercise heart rate tracking remains weak—correlations of 0.91 for spinning, 0.95 for running, and 0.72 for outdoor cycling—making it unsuitable for activities with rapid heart rate changes or significant hand involvement. The smaller form factor improves comfort, but users needing reliable sleep staging or exercise HR should consider alternatives like the Ring 4, Whoop, Fitbit, or a chest strap.
These notes were generated by AI and may contain inaccuracies.
The smaller form factor of the Aura Ring 5 has grown on the reviewer over the course of more than a month of testing. While the reviewer personally has no problem wearing larger smart rings, the smaller design offers improved comfort compared to substantially larger devices like the Ultra Human Ring Pro. The smaller design is noted as not being the most interesting discovery from systematic testing.
The reviewer is getting worse sleep stage tracking results from the Aura Ring 5 compared to the Aura Ring 4. This finding is based on all data collected across more than a month of testing, making it difficult to dismiss as simple day-to-day variation. The reviewer discussed these findings with Aura, and according to the company, their internal testing doesn't show any meaningful difference in sleep stage tracking performance between the Ring 5 and Ring 4. The reviewer cannot explain why their results appear worse, as they are wearing it on the same finger as before. A second Aura Ring is being tested on the right index finger, but data from the left ring finger is the focus of this analysis.
Nighttime heart rate and heart rate variability measurements from the Aura Ring are described as absolutely stellar, remaining the best in the business based on testing. Exercise heart rate tracking appears to be improving but is still not where the reviewer would want it to be, particularly for activities involving rapid changes in heart rate or significant hand involvement.
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