A free app for Android, by Doge Mobile.
Gallery Vault is a photo and video vault app for Android devices that lets you safely hide your private pictures and videos from other people and apps. It has a simple and intuitive interface, making it easy to use, even for people who don’t know how to use apps or privacy protection. It also allows you to create a PIN code to make your files inaccessible to everyone except for you. Gallery Vault is a safe place to keep your personal photos, videos, and files.
The interface of the app is clean and simple, letting you see all your hidden files at once. There is also a preview of your photos, so you can see what they look like. You can browse through all your hidden pictures and videos, or use the built-in search function to look for a specific photo or video.