I’ve been using this app for some time, and it is my go-to app for looking up terms/kanji in Japanese or for studying flash cards. There are many many useful features, from easy ways to study, finding terms from different vocabulary classifications, parts or speech, JLPT level, Kanji Kentei level, the list goes on and on. I highly recommend this for any Japanese language learner, whether you’re learning it casually or are serious about working/living/studying in Japan, this is the most useful app there is for Japanese. The value is incredible here and I want to say thank you to the developers for keeping it free.