Chara-Anireleased a smartphone version of Pomtto! that’s playable in both iOS and Android environments. It appears to have the basic game as found in Ao no Kiseki, where you can compete against various characters from within Ao. The game plays through touch screen functions, flicking on the screen to make motions, and touching in the lower right corner to drop the poms.
The game is free on both systems.
Note: I can confirm, however, that the game is region locked on the Google Play store. I don’t know about the iOS version, however.