Ask HN: Ideas for iPhone Japanese Hiragana Memorization app

Hi guys,

So I created an iPhone app for memorizing the Japanese Hiragana. Essentially, at the moment, it's a very basic flashcard app. You look at the alphabet, double-tap and it flips to reveal the "English" pronunciation of it. I have some promo codes if anyone would be interested in helping me out.

http://itunes.apple.com/us/app/hiragana-swipe/id450666339?ls=1&mt=8

I tried to keep the feature set simple. I think I will add voice to it eventually and maybe have some sort of quiz mode to test the user. I'm open to any ideas you guys may have.

Thanks!