App Lock Master is a free Android app developed by One Dot Studio that provides advanced functions for locking apps and ensuring your phone's security. With one-tap, you can lock sensitive apps like WhatsApp, Instagram, Facebook, Messenger, Gallery, Gmail, and the Play Store with password lock/fingerprint lock. The app also allows you to lock systems and installations like SMS, contacts, and system settings to prevent unauthorized access. Locking the app market on your phone prevents others from buying unwanted apps/games, while locking system settings prevents apps from being uninstalled.

App Lock Master also has advanced features such as Intruder Selfie, which takes photos of anyone who tries to unlock your apps with the wrong password three times. You can also hide the AppLock icon and replace it with a calculator or browser icon to avoid others knowing that you have installed App Lock Master.

Overall, App Lock Master is a smart and super applock that provides 360 security protection for your Android device.