What is the crowd's opinion of Cardiograph - Heart Rate Meter?

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Cardiograph by MacroPinch. The app defaults to use the rear camera instead of the sensor, but you can switch to it in the menu.

Also, Merry Christmas to you! :)

Try Cardiograph app.

It uses the camera + led, maybe not as accurate as s8 dedicated heart rate sensor

https://play.google.com/store/apps/details?id=com.macropinch.hydra.android

https://play.google.com/store/apps/details?id=com.macropinch.hydra.android