A free program for Android, by Calendar Date.

Have you ever had a friend borrow your phone to play a game, only to discover that he or she has been viewing your personal photos and information? If so, you’ve probably experienced a breach of privacy. Now you don’t have to worry about it happening again.

In the latest version of the App Lock application, you can lock not only the apps you have installed but also any app you choose. This means that if you want to ensure that your children don’t mess up your phone, or if you want to lock Facebook, WhatsApp, Snapchat, or any other app, you can do it.

It is very easy to use. All you need to do is to install the application and set the password. You can use a simple four-digit password, or you can use a more complex password. The important thing is that you should remember the password so that you can open the applications you want to secure.