How to perform actions by tapping the back of your android phone
Quick Tap on Google Pixel: Go to Settings > System > Gestures to enable Quick Tap. Choose an action and simply tap the back of your phone twice to activate it.
Back Tap on Samsung Galaxy: Install the RegiStar Good Lock module. Select “Back-Tap Action” and set actions for double tap and triple tap gestures. Tap the back of your phone the specified number of times to activate the actions.
Tap, Tap for Android: Download Tap, Tap APK file from GitHub and toggle it on. Customize double tap and triple tap actions. Enable the Accessibility Service for certain actions. Use handles to adjust the order and add requirements or gates. Explore numerous options for useful shortcuts.