Perfect AppLock is an easy-to-use tool for locking your most-used apps on Android devices. It offers four different methods of locking: 

A. Fingerprint – if your device supports fingerprint recognition, this is the best and safest way to secure your apps.

B. Pattern – create a pattern to lock your apps, just like you would do with a password.

C. Password – if you have a device that supports passwords, you can use this method.

D. The standard method – use this if you don’t want to lock an app with a fingerprint, pattern, or password. This method is the safest option.

Once you have locked an app, you can change the settings to make it even more secure.