I found and downloaded this App out of interest as a beginner learner of the Japanese language. It’s well above my current level, but an extraordinarily interesting App.
Having played around with it for about 20 minutes, I have already learned something useful. This will be really useful when I further my learning and progress.
For all of its technical content and ease of use, I am really quite astounded it is free. An utterly superb App which I will begin to use on a more regular basis.