Track your HRV in Gyroscope

Connect your ring or watch, and Gyroscope shows every night's HRV against your own normal, with your sleep and drinks right beside it.

Connect an Apple Watch, Oura, WHOOP or Garmin and every night's HRV lands in Gyroscope on its own, charted against your own normal. Apple Watch's SDNN and the RMSSD from Oura, WHOOP and Garmin are kept apart and never averaged, and your sleep, resting heart rate and drinks sit beside it, so you can see what came before a low morning.

Get GyroscopeSee Gyroscope One

How each device gets there

• Oura, Garmin and WHOOP connect directly and send your overnight RMSSD.
• Apple Watch comes through Apple Health, as SDNN measured while you are still.

What comes with each plan

Gyroscope One gives you the HRV trend page, the morning sleep report and the coach. Wearable sync, the stress meter and 90 nights of HRV history start at Pro.

Pick one device and keep it

Wear one device every night and judge each number against your own last few weeks on that same device. Numbers from different methods don't convert, so a switch starts a new history.

For nightly tracking with no effort, Oura Ring 4 has the best published agreement with an ECG chest strap so far, from one small study. For a morning check on a budget, a Polar H10 strap with the free Kubios app has the best evidence, though a strap or phone app has no confirmed path into Gyroscope yet.

When a number is a reason to see a doctor

HRV from a consumer device is a wellness number, and it can't diagnose anything. One low night is common and has many causes. Talk to a doctor if a low or falling trend comes with symptoms that worry you, such as a racing or irregular heartbeat, dizziness or unusual tiredness.

Call emergency services for chest pain, fainting or severe trouble breathing, whatever your device shows.

Some medicines change HRV, so ask your prescriber about that, and never change or stop a medicine because of this number.