Kicks おしり!

Excellent APP! すごいです!
I have been using now for a month, and have found it to be extremely useful for increasing my vocabulary, especially when I have just a few moments to spare. The "smart" learning system works well, even though I feel dumb at times when I have to hit the "wrong" button many times for some of the harder kanji. But it has been working great for me!

NFOboy about Kanji Flip