YOUR DEVICE
How to read your device’s HRV
Every wearable names HRV differently and measures it at a different time. Pick your device to see which HRV it shows, where the maker explains it, and whether it can connect to ONDA. The best comparison is always with your own recent nights.
| Device | HRV shown | Connection to ONDA |
|---|---|---|
| Oura | Night-time average (during sleep) | Direct connection planned |
| WHOOP | RMSSD, in milliseconds (in Recovery) | Direct connection planned |
| Polar | Night-time, first ~4 h of sleep (formula not confirmed) | Direct connection planned |
| Garmin | Night-time, vs your personal range (formula not confirmed) | Developer access closed |
| Fitbit | Not confirmed from official pages | Developer access closed |
| Samsung Galaxy Watch | Not confirmed from official pages | No public web API |
| Withings | Not confirmed | Under review |
| Ultrahuman | Not confirmed from official pages | No public web API |
| RingConn | Not confirmed from official pages | No public web API |
| Amazfit | Not confirmed from official pages | No public web API |
| Apple Watch | SDNN (Apple Health) | Works with the ONDA app now |
Read more on ONDA Science
When a number is not the point
No HRV reading can tell you whether symptoms are serious. Whatever your device shows, call emergency services or get emergency care for: chest pain or pressure; fainting or near-fainting; severe shortness of breath; fast, strong or irregular heartbeat that does not settle at rest (including with dizziness); sudden confusion, weakness on one side, trouble speaking. This page is not medical advice and does not diagnose anything.