I have been speaking Japanese ( fluently ) for over 40 years ( sincere 1982, when I was 22 and lived and worked there for two years ). I have been using this app for several years to help keep up with the language and I absolutely love it. For me it is the best Japanese reference I have ever found, bar none. The completeness of the database/vocabulary and the in-depth study of each word is amazing. I use it regularly.