Black Domain on Android is an app that kills rogue apps, aiming for “an Android experience just like iOS.” That’s a bit different from Greenify — Greenify feels more academic, while Black Domain is more practical. I paid for both. In the end I went with Black Domain. Black Domain works without root too. You just have to turn on USB debugging and type a command to start one of its processes. Calling it a hassle is fair, and calling it convenient is fair — basically, every time your phone reboots, you have to find a computer to activate it… So the author of Black Domain had an idea: make a “Black Domain Activator.” It’s a collaboration with some gamepad adapter, but using it is fine anyway, and it’s cheap.