A free app for Android, by SKYUNION HONG KONG.

KeepLock – AppLock & Protect Privacy

If you’re looking practical app that can keep your photos, videos, messages, and contacts private, you’re in the right place. KeepLock is a free app that allows you to do just that.

When you open the app, you’ll be presented with a simple and intuitive interface that lets you choose the types of files you want to keep private. This is useful if you have photos, videos, and messages you want to hide from anybody who has access to your phone. The app has three unlocking methods you may choose from: pin, pattern and fingerprint.

Moreover, the app is disguised as a calculator, keeping people from snooping on your phone.