일본어한자200일완성 is an education app by EDDY_COLA with 10+ downloads (about 21 estimated). Install growth, rank history, SDKs and ad networks.
From the store listing: “Master 2,136 Commonly Used Japanese Kanji in 200 Days, Learning 11 Characters a Day! Remember Them for a Long Time with Scientific Repetition Spacing (SRS).”