Misses only a few things
Only things missing are: An option to write the kanji youself following out-greyed "ghostlines" in order to test if you knoq the right strokeorder. Furthermore, kata- and hiraganacards, which would benefit beginners and that would be easy to integrate.
That aside, the app gives you everything you need and is totally worth the not-so-cheap price!
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StickyStudy Japanese, v2.51