The free version allows remapping of the Home button (if your phone has one) and volume buttonsAdditional features unlocked in the pro version:-support for back button, recent apps button and camera button
-Lockscreen peek
-Homescreen lock
-Four themes
-customization of haptic feedback (vibration) on button press and long press
-option to bypass specific apps
Actions that can be mapped to buttons or keys:-Launch any app or shortcut
-Disable the button completely
-Home, back or recent apps
-Last app
-Turn screen off
-Toggle flashlight
-Quick settings
-Show notifications
-Power dialog
-Take screenshot
-Music: previous track, next track and play/pause
-Adjust volume
-Toggle do not disturb
-Adjust brightness
Buttons supported:-Home
-Back (PRO version only)
-Recent apps (PRO version only)
-Volume up
-Volume down
-Camera button (PRO version only)
Special features:-Lockscreen peek (PRO version only)
-Homescreen lock (PRO version only)
-Swap back and recent apps buttons
-Adjust button light duration on Samsung Galaxy devices (Lollipop and older)
-Adjust button vibration on Samsung Galaxy devices (PRO version only, Lollipop and older)
Additional options:
-fine tune button behavior with options to bypass Button Mapper when camera, phone or system UI is showing
-change the long press or double tap duration
-delay initial button press for better double tap operation
-disable Button Mapper while using specific apps (PRO version only)