This app was mentioned in 1 comment, with an average of 1.00 upvote
https://play.google.com/store/apps/details?id=com.iethis.vapebuilder
This one is my favourite and I've tried most of them. I love the visualisation! My only criticism is that you have to either see wire AWG or its equivalent mm.
That means if I want to build a 2mm coil I have to choose the wire size in mm, and if it's in AWG I have to see the diameter in inches. Not a big deal at all and they're fixing it in a later update!