This app was mentioned in 4 comments, with an average of 10.25 upvotes
I made one of these experiments:
https://play.google.com/store/apps/details?id=cc.openframeworks.inkSpace
happy to answer any questions about it... there's a bunch of other fun projects on the main page and even a call to submit your own https://www.androidexperiments.com/submit
ps: it's not AR but I made this app on android a few years ago -- https://play.google.com/store/apps/details?id=cc.openframeworks.inkSpace&hl=en_US
Ink Space is awesome, you can draw, multi-touch, and you can rotate the drawing when you tilt. No ads. Double tap to clear drawings
https://play.google.com/store/apps/details?id=cc.openframeworks.inkSpace
I am surprised that no one has mentioned the 3D Drawing program for android Inkspace