I used to use a few apps on my Android made for Japanese students, but it seems they’ve been removed in the meantime from the Store. I use this one exclusively now: https://play.google.com/store/apps/details?id=jp.or.kanken.shirikan.free but it’s not in WK order (neither were the ones I mentioned before).
I also used this to generate practice sheets for myself to practice writing with a pen: Website for generating printable kanji worksheets