I purchased this app years ago for my iPad. It is a great app, the stroke order animations and sample sentences are a terrific tool. I do notice it is missing the classifications by word type, Joyou and JLPT level available on my iPad version. It would be nice to have a list of Joyou kanji sorted by grade in a future upgrade. As other reviewers have mentioned, a way to export the study lists would also be helpful.