Well, you do need mana to cast it, but luckily my other apps can harness that sort of power remotely. Or at least, they did until such energies became able to be tapped into outside of what we call ley-lines.

But hm, that seems particularly nasty. In my world, magic became something of a rarity due to magical power diminishing worldwide. But with that all restored, it's becoming commonplace again. It's used for things like healing, transformations, reversing and slowing time...really, it covers a wide range.