Ringotan
SRS app that drills kanji handwriting stroke by stroke, on your phone.
AppsFreeBeginnerIntermediateAdvanced
What it actually is
Covers kana plus 3,500 kanji including all jōyō and jinmeiyō characters, checking your stroke order as you draw. It can sync its order to WaniKani, RTK or JLPT levels so it slots into whatever you already use. Currently free on iOS and Android (the developer has said early users keep the full version free permanently). Handwriting is a real time cost, so it only makes sense if producing kanji by hand actually matters to you.
What it covers
- Writing
- Reading