KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
AppLock (FOSS) - A privacy App lock FOSS application.
Lynx Privacy-Hide photo/video - Lynx is a professional app designed to protect a hide mobile privacy.
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.
Applocker - You can use AppLocker as part of your overall security strategy for the following scenarios: