ECGLogger
This app is able to read ECG data only from Polar H10 heart rate sensor, and does not work with other devices. However, this is not an official Polar product and is not approved or supported by Polar in any means.
This app is not a medical device. It is not intended to diagnose, treat, cure, or prevent any disease or health condition. If you are concerned about your health, please consult a medical specialist.
If you have questions or comments about the app, feel free to contact me via email at matti.mononen@protonmail.com
Technical notes
iPhone's Bluetooth needs to be enabled, and ECGLogger needs permission to use Bluetooth in order to communicate with Polar H10
Close other apps using Polar H10 (such as Polar Beat) because H10 can simultaneously be connected with one app only
After wearing Polar H10 click 'Connect', and allow Bluetooth pairing if requested. ECG should be visible after a few seconds
Recording is a premium feature so you need to pay once to activate it
Recording works also in background, app shows only the last minutes of the data but all the data is recorded
To open your recording, click 'Open' and navigate to 'On my iPhone' -> 'ECGLogger'
Recordings can be managed (removed, shared, etc.) by using Apple's Files app
Several hours long recordings are possible: ECG graph is compressed for fast prosessing but all the details are available when zoomed in
Recordings are in CSV format: the 1st column being UNIX timestamp in nanoseconds, the 2nd column being ECG in millivolts, and the 3rd column being pulse in beats per minute