A smart ring with no subscription
Colmi R10
Slim smart ring, no subscription
The ring we've tested most: what's below is measured on our own ring, not copied from the box.
Tested by us
How sure we are
Verified: we've recorded this ring's data ourselves (firmware RT03CR_1.00.01_250104).
| Heart rate | Every 5 minutes, or less often to save battery (measured) |
|---|---|
| HRV | Hourly (measured) |
| Blood oxygen | Hourly (measured) |
| Skin temperature | Every 30 minutes (measured) |
| Sleep | Light, deep, REM and awake, minute by minute (measured) |
| Battery | About 6 days with hourly syncs (measured on one ring) |
| Sizes | To fill in from the maker's size chart |
What it is
A slim smart ring that tracks heart rate, HRV, blood oxygen, skin temperature, sleep and steps.
How to choose
- Buy the R10 by name. Listings for "smart ring" are full of lookalikes we haven't tested.
- Use the sizing kit if the seller offers one. Rings that fit loosely give noisier readings.
- Expect it to be an estimate, not a medical device.
Watch out
- Readings are estimates for wellness, not medical measurements.