App Lock by SailingLab is one of those app lockers that has a multitude of features apart from protecting apps from unauthorized users. While you have all the standard app locker features like PIN, Fingerprint, and Pattern protection, it also brings a photo vault, intruder selfie to catch people who are trying to break in, and message security for hiding chat notifications from sensitive apps. And that is not all, it also has a privacy browser but I would not really recommend using it.