KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
Photok - A safe place for your photos. It stores your photos encrypted on your device and hides them from others.
Lynx Privacy-Hide photo/video - Lynx is a professional app designed to protect a hide mobile privacy.
AppLock (FOSS) - A privacy App lock FOSS application.