A free program for Android, by Smart Solutions Pro.
Calculator Lock: Media Vault is an app to create a secret Calculator Lock that helps protect your privacy and keep your files safe from intruders.
A normal Calculator app is a useful tool to perform calculations, but when you use it as a media vault, it becomes a secure locker that hides photos, videos, music, and other files.
How to install Calculator Lock: Media Vault
Open your Android smartphone or tablet, and install the app.
Once the installation is complete, you will be able to open the app and start creating your secret Calculator Lock.
In order to access the app, you will need to create a password that you will remember.
After you enter the password, you will be able to access your files and hide them.