CinnaAyn

I use it for Spanish and love it!  However, I tried the Chinese app and found it not equipped to handle languages where intonation changes meaning.

I have it for Spanish and Arabic.  I think it's good a good program for those who can do intensive study.  For me, I need to learn in little spurts and it doesn't lend itself well to that.  It does keep the things varied though and changes it up while you are learning.  I just don't have the attention span for it.