The new app ‘HeartOnTop’ allows you to record your heart rate from internal/built-in sensor of Android devices. The advantage using “HeartOnTop” is the combination of your internal sensor with every app, without need of support from combined app. It will show your heart rate in a small window in foreground/front of your screen, so you can take a look at your heart rate and your preferred app (e.g. running app) simultaneously. Moreover, it is possible to drag the heart rate monitor to every position on your screen you want and even set to the size you need. The app will only record your heart rate if it detects your pulse, so you can leave it running while workout and measure continuous or at times. Originally, the app was designed for the use on watches with full android system like Zeblaze Thor (not Android-Wear!). In front of this background, we created big-sized buttons and views as well as a simple user interface to control the app on small screens. However, the app should work on most phones with built-in heart rate sensor.
Update: Sync to Google Fit and start workout via Google fit.
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Available at GooglePlayStore