App locker with cloning feature
Hide Apps - App Hider is a free utility application for mobile. It is an app locker tool that lets users protect specific apps from being accessed by placing them inside a special hidden folder away from prying eyes. It is disguised as a calculator, so no one's the wiser.
Hide apps and more
Hide Apps - App Hider is a hidden vault/folder disguised as a standard-looking calculator wherein you can put any app or game you don't want others to see and open. You can then further protect it by adding password protection in case someone tries to open it.
The other nice feature is its app cloning capabilities that let you run two parallel apps with different accounts simultaneously, which is great for circumventing those one-account-per-device restrictions. However, performance can be a bit slow, and there have been instances when apps launched from inside the vault don't open.
Interesting combo
Hide Apps - App Hider is an interesting combination of an app vault and cloner, and the result is good. It is easy to use and works with any app or game you want to hide away or clone. Aside from the issues mentioned, this one is worth checking out.