This app was mentioned in 2 comments, with an average of 1.00 upvote
I use Kanji Draw on Android. I has no other functions than drawing kanji and you have to draw every stroke or else the app doen't recognize it.
Kanji Draw is what I use want to draw kanji.
However, most of the time I use the Google Translate camera feature to input kanji. Translate itself is pure gibberish, but the camera function is fantastic. I transcribes the picture into text and then I just copy paste into an electronic dictionary on my phone.