The only drawback is that Anki (at least on iOS) costs a lot. http://itunes.appl...

The only drawback is that Anki (at least on iOS) costs a lot.

http://itunes.apple.com/us/app/ankimobile-flashcards/id37349...

If you can duplicate the benefit and make the UI simpler (e.g., simplify it down to two buttons: I got it right / wrong), and make it cheaper, you have an ok chance to do well.