Measures and records heart rate and heart rate variability (HRV) data to phone storage folder for use in HRV synchronisation research. The app uses as input a Bluetooth Low Energy (BLE) heart rate monitor. It has been tested with the HeartMath Inner Balance earlobe heart rate monitor and as well as the Polar H7 and H10 chestband ECG heart rate monitors.

Data is recorded as RecordData.txt, as CSV file in storage folder of device and can be downloaded for charting of data and further analysis.