Island is an app that lets you carry out two interesting actions with any app you have installed on you device: clone or isolate. Cloning an app lets you run two identical apps in parallel; while isolating an app lets you run it within a virtual bubble so that no matter what happens with the app, it won't affect your device.
Although these are the two most interesting features Island offers, they're not the only ones. You can also freeze an app to block it completely, and hide apps so only you know they're installed on the device.
Island is an app with a handful of really interesting features. That said, in order to use the app, you need to have your device rooted and encrypted. In fact, the app can also guide you step-by-step to encrypt your device if you need it.