Great for learning vocabulary. – Kanji Sensei - Learn Japanese Kanji Review

I have used other apps and software trying to replicate this. It's simple and very much like flash cards, however does a little more than flash card by trying to distinguish how to use the on reading and kun reading. Edit: the update does wonders by introducing lists and learning by grade level instead of the JPLT.
Review by Eno Crux on Kanji Sensei - Learn Japanese Kanji.