
Miguel Sternberg
good basic practice app. unfortunately has very intrusive ads and no way to pay to get rid of them.

Butter Lock
It works well and is good for practising flick. Also, it tells you your typing speed, and there is a leaderboard. The only thing I would want different is the ability to toggle the word's furigana.

Storm Sith
its definitely pretty fun and helped me a lot with my Japanese keyboard typing, I can type from what use to be 200-300 CPM to now 34.51CPM at rank D, one problem is that words can definitely get repetitive at times.