A free app for Android, by GFXGB Tools Developers.
Gallery Lock is the best photo vault and app hider. If you are looking for a Calculator Vault, Gallery Lock can do the same work for you. All you need to do is set the hider code in the app settings, and the photos, videos, and other items you want to hide will be stored in a secret place. You can view the items in the photo vault and download the Calculator Vault files to your device at any time. Gallery Lock supports hiding videos, photos, apps, and all other private items. You can download Gallery Lock for free and try it out.
