Very simple yet highly effective app for learning Japanese alphabets: Hiragana and Katakana. Unlike other similar apps it is based on our state of the art algorithm that estimates your ability to retain knowledge over time and suggests what Kana sybmols you may need to repeat each time you start the app. It makes maintaining your knowledge effective and effortless.
Good news: The Free version of the app from now on will include full sets of Kana symbols including diacritics and digraphs!
There is also iPhone version of the app available from iTunes: https://itunes.apple.com/us/app/learn-hiragana-katakana/id665721310?mt=8&uo=4