Best available – Learn Japanese!! - Hiragana Review

It's actually very good. I've tried a lot of other apps, as well as some chart, pen, and paper type stuff. This is a much more successful method of learning characters. Update: The app desperately needs an option to review all hiragana only or all katakana only, as well as an advanced hiragana/katakana option.
Review by ManjoBanjo on Learn Japanese!! - Hiragana.