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I know this is an old thread, but the only thing preventing me from buying this app is the lack of an exit button. I completely understand how memory works, but that is not the issue.  when I close the app I want it to disappear off the screen completely. It's simply in the way to keep the entire user interface open even if its not using memory. It's a very simple matter to add an exit button and it would make closing the app much more intuitive for the user. If you add an exit button, I will buy this in a heartbeat, but without an exit button I will never buy it.