Kanji Graph is a smart offline Japanese-English dictionary. It is free and ad free. You can search words by rōmaji, kanji and kanji parts that you can quickly select from the search results (see a demo here https://youtu.be/nb3NG9W6iDY). You can also draw kanjis that will be recognized independently of stroke order or stroke count.

You can study and review word readings in a graph where nearby words share common kanji readings. All your actions (in the graph quiz and in the dictionary) will update your level for each kanji reading.