App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?

Stingle Photos - Stingle Photos is a secure photo/video encryption and backup application that provides strong security, privacy, encryption and safely saves your media on cloud storage keeping you safe from data breaches and leaks.

Hexlock - Security app locker keeps apps private with smart profiles for any situation

KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.

AppLock (FOSS) - A privacy App lock FOSS application.

Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.