Oura
Oura Ring 4
Sleep and recovery tracking
From 349 USD
A smart ring tracking sleep stages, heart-rate variability, and temperature trends.
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- Sleep staging and HRV
- Temperature trends
- Feeds your Thrive Score
Sleep is the highest-leverage input, and a wearable turns it into a number you can actually move.
What the evidence says
Wearable sleep staging is directional rather than lab-grade, but trends are useful for behavior change.
From the Physiome library
Independent, evidence-tiered reading on the science behind this product.
