A free program for Android, by Quality App Zone.

App Hider is a free, powerful, secure and hidden app lock, designed for Android 6.0 and above. It hides files that you want to hide from apps, such as gallery and WhatsApp, so they can’t see what you are doing or accessing.

App Hider: Photo Vault hides pictures and videos in your phone. You can set a strong password, use an authenticator, and hide your files with the best possible protection. 

App Hider: Photo Vault is a free app lock designed for Android.

It lets you hide apps for privacy and security reasons. This allows you to keep important things private and secure from prying eyes.

App Hider: Photo Vault is the best tool to protect your privacy and your files.