Smart App Lock

Smart App Lock is a security app to set up virtual barriers on your Android device. With Smart App Lock, you can password-protect specific apps or use other protection methods.

Smart App Lock's two main features include lock screen protection, which allows you to hide certain apps from the lock screen, and app protection, which allows you to put a virtual lock on any app on your device.

The best part of this second option is that it not only lets you set a password to open certain apps, but also fakes out anyone who tries to snoop. It does this by creating an error message that will pop up if someone tries to open the application. That said, if they hold down the 'OK' button for a few seconds, they can access it normally.

Smart App Lock is a good security tool to protect your apps from prying eyes. Don't want anyone to read your WhatsApp conversations, for example? Put a password on it with this app and you're good to go.