A free app for Android, by SailingLab.

Do you want to use a different style of lock screen but still need the same security? Do you want to show your friends a cool and unique lock screen picture? If the answer to any of these questions is yes, then you should definitely download this theme for your phone. It is a very beautiful, simple, and easy-to-use application that will help you to create your own lock screen. It is completely free to download and use, and the theme will be with you forever.

How to install and use it?

First, you need to download the AppLock application from Google Play.