Indispensable!
From all the numerous apps on the market this is the one that got me into studying regularly again. And forming a habit is definitely key to successful language learning. Doing the quizzes is fun and intuitive. The amount of information provided is excellent. Also the developer is very responsive to questions and dedicated to customer support. Im looking forward to using more of his apps for other areas of study!
Flo.K. about
StickyStudy Japanese, v3.15