It really works: I locked four applications I do need to keep running and there they stay. No root!
I wanted to lock more than one app and I don't mind paying extra for premium, however when I click to upgrade to premium it says I need to add a Google account. Also the toast notification every few seconds is extremely annoying, you really ought to disable that, going to have to uninstall if I can't get rid of it because it's annoying af. Update: I got rid of the toast notifications with supersu, it turned out to be a supersu issue. The request for a Google account was a permissions issue, granted permissions and it upgraded to premium just fine. I locked poweramp and floating apps as a test and loaded half life 2 on my Nvidia Shield tablet with a song playing in poweramp, halfway through loading half life 2 poweramp closes, app does not work, I demand a refund.
Well, it seemed to work but I uninstalled it because it shouldn't need access to my contacts or location to do its job. Also, it shouldn't need root every few seconds.
The app used to work, but now it does not. Even though I have locked Spotify and made sure I have done it correctly, it still closes in the background. And this app has other issues. It needs your location and contact permissions, which I am certain an app like this DOES NOT need. And the advertising is just too intrusive. If you do not swipe away the app in your recent apps list, it may pop up and interrupt whatever you are doing with an ad. And for all these reasons, I cannot rate higher than two stars, and I think that's being generous.
Unacceptable amount of permissions required, likely so the information collected can be sold to the ad network they're using. To top it off, the app doesn't even do what it says. I tested this with pokemon go, setting the priority to -17(as high as possible). I have 3GB of RAM and pokemon go takes 1.5gb. Pokemon was unloaded as soon as I opened google chrome and loaded a single tab.
Fixed minor issues