This app was mentioned in 1 comment, with an average of 1.00 upvote
Shameless self-promo:
Just released Stylish for android: https://play.google.com/store/apps/details?id=com.voxeloid.stylish
It's using the fast-forward flavour of neural style (like Prisma) and everything is processed locally, no private images sneakily being uploaded to a server. (and it only takes a few seconds on modern phones)
The app is free, so far there aren't even ads in it.