google.com/store/apps/details?hl=en_US&id=org.niwatoris.niwatorikanji
App for learning 257 kanji commonly used in JLPT N3 and N4 exams, with example sentences in eight languages, illustrations, and multiple-choice quizzes. Twenty characters are available free.
Kanji and kanaEducational gamesJLPT and other testsJLPT N3JLPT N4JLPTAppsExample sentencesFree