You want to train your Kanji / vocabulary learning before taking the JLPT (Japanese-Language Proficiency Test) or just to read some awesome light novel you discovered (or even manga, visual novel, ...) ? Tsukiji is the right app to do that. You can select every kanji you already know, then take quiz to check if you really do.
You can even use your own font if you want to train cursive kanji.
With this application you'll have a fluid, user-friendly, and material design style interface.
This application is heavily based on Obenkyo, if you want some advanced feature like Kanji writing training, you should check it out !