Have you checked in mobilism? I searched for it and found some releases and bunch of (paid?) skins for it? I never used it and heard about it just from your post, but from what I gathered from releases on mobilism that even modded versions are trial ones and you have to clear app data every 15 days to reset the trial. The catch is that app has backup/restore function that does not work on modded versions for some reason.

On not that related note. mobilism policy is quite strange. It seems they allow some "trial" versions but not others. I managed to crack an app that had only a trial version, that work for 24h and then would locks the UI and asks user to buy a pro version. You could clear the app data and use trial version for another 24h, but every time you would have to go through short setup that becomes tedious fast. I simply removed that time check and in my opinion for all intent and purposes it became a pro version. They removed the app for being a trial version.