A free app for Android, by Utilitarian Tools.

App Locker helps you lock your applications with a strong password or pattern. App Locker is one of the best privacy and security apps. It has a unique and intuitive design, so you won’t have any problem using it.

You can use it to lock your gallery, contacts, SMS, e-mail, chat, and any other application. You can also use it to hide pictures and videos. You can also use it to hide audio and video files.

This app has a built-in password manager, so you can use it to create and manage a strong password or pattern. You can use the password to access your locked applications.