App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
Hexlock - Security app locker keeps apps private with smart profiles for any situation
AppLock (FOSS) - A privacy App lock FOSS application.
KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
Leo Privacy - Lock your Favorite apps like Whatsapp, Facebook, Wechat & Other Chat Messenger.
Viso - Beautiful minimal image viewer for MacOS