A free program for Android, by mmosoft.
AppLock is a utility that helps to protect your private data. It employs an efficient mechanism that enables you to lock your applications with a simple and unique password.
It is an easy-to-use tool that lets you lock Facebook, Whatsapp, Gallery, Messenger, SMS, Contacts, Gmail, Settings, incoming calls, and any app you choose. It also allows you to use different types of lock screens and keypad designs. You can now secure every data that you want to be hidden.
AppLock offers various options that allow you to personalize your experience with this utility.
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