hrv.expert

HRV Expert app

HRV Expert is a free Android app that turns a Bluetooth chest strap into a heart rate variability (HRV) tracker. The main number is RMSSD, from a two-minute check each morning. After about two weeks, the app tells you whether you are below, within or above your own normal range.

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How to get it

  • Android: in closed testing on Google Play. Only people on the testers list can install it. To join, request access below with the address of the Google account on your phone. Once we have added you, open the testing page on Google Play on that phone, become a tester and install the app from Google Play.
  • iPhone: a version is in preparation. It is not available yet.

Request access

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What it does

  • A two-minute morning check with your strap, compared with your own normal range once about two weeks of checks are in.
  • Trends over a week, a month, three months or a year, with optional morning questions and tags such as poor sleep or travel.
  • Overnight and longer recordings, with heart rate and RMSSD every 5 minutes and each night’s resting heart rate.
  • Workouts with live DFA alpha1 and estimates of your two training thresholds.
  • Paced breathing with a visual pacer, and a test that finds your resonance breathing rate.
  • Exports of every beat and result: RR text files, CSV, JSON, PDF reports and FIT files.
  • If you want, sharing through hrv.expert: your readings with a coach from your account, and your heart rate on the live page while you train.

Screens

The screens show the app’s demo profile, filled with made-up data.

  • Today screen: readiness status, morning RMSSD in ms with the normal range, 7-day baseline and the last 30 days
  • Trends: morning RMSSD over 30 days with the normal-range band, L/H flags, and day-to-day variation (CV)
  • Overnight recording: heart rate and RMSSD through the night
  • Exercise result: aerobic threshold estimate (HRVT1) from DFA alpha1
  • Paced breathing: the pacer circle and the live resonance score
  • Export: RR .txt, beats CSV, recording JSON and PDF report

Chest straps

The app works with chest straps that send beat-to-beat (RR) intervals over the standard Bluetooth Heart Rate Service. Straps such as the Polar H10 and H9, Garmin HRM-Pro Plus, Wahoo TICKR, Suunto Smart Sensor, Coospo H6 and Magene H64 are expected to work.

Optical sensors worn on the arm or wrist give heart rate only. They are not suitable for HRV.

Polar, Garmin, Wahoo, Suunto, Coospo and Magene are trademarks of their owners; HRV Expert is not affiliated with them.

Your data

Recordings are stored encrypted on your phone. Nothing leaves it unless you turn on an integration, such as an hrv.expert account, or share a file yourself.

Read the HRV Expert app privacy policy, or see how to delete an hrv.expert account.

The app in 70 seconds

Play the video

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HRV Expert is for wellness, training and research. It is not a medical device and does not diagnose, treat or monitor any disease. If you have concerns about your heart, see a doctor.