A free program for Android, by kunkun apps.

AppLock is an app that you can use to lock your apps and protect your privacy. It can lock both system and application settings, and it can also lock the Gallery, Messages, Phone Calls, Contacts, SMS, and other apps.

When you install AppLock, you will be given the option to set a password or pattern to protect your apps. You will also be given the option to set a fingerprint to use with your device. If you choose to set a password, you will be given the option to choose a password length and strength.