Heart Rate Variability Logger

Record, plot and export heart rate variability (HRV) from a Bluetooth heart rate strap, beat by beat. HRV Logger connects to any Bluetooth Low Energy chest strap that sends RR intervals (we recommend the Polar H10). It stores every beat, computes HRV features in real time and lets you export the full recording for your own analysis. WHAT YOU GET • Live heart rate, RR intervals and HRV while you record • Time domain features: AVNN, SDNN, rMSSD, pNN50 • Frequency domain features: LF, HF and LF/HF • DFA alpha 1, for example to estimate the aerobic threshold during exercise • Feature window of 30 seconds, 1, 2 or 5 minutes • Optional RR correction to reduce the effect of artifacts and ectopic beats, with artifact counts per window • Threshold filter, and the option to hide noisy windows • Annotate events, or set up prompts that ask you to annotate during a recording (experience sampling) • Compare up to three recordings side by side • Optional step count and location to add context • Heart rate on the app icon while recording • Apple Watch app with real-time HRV • Export as CSV or in a Kubios-ready format, through Files, email or Dropbox BUILT FOR LONG RECORDINGS HRV Logger has been tested with recordings longer than 24 hours, and reconnects to your strap if the connection drops. WHO IT IS FOR Researchers, coaches and athletes who want raw beat-to-beat data and full control over the analysis. If you want daily morning measurements with guidance and trends, have a look at HRV4Training. Requires a Bluetooth heart rate strap that sends RR intervals. Optical wrist and arm sensors usually don't. Background location uses more battery; you can turn it off. This app is not a medical device and is not intended to diagnose or treat any condition. Questions or feedback: [email protected]