What are some alternatives?
When comparing Kodon and Snap Art, you can also consider the following products
A-Painter - Paint in VR in your Browser
Apple ARKit - A framework to create Augmented Reality experiences for iOS
Oculus Medium - Sculpt, model and paint in virtual reality on a 3D canvas.
Made With ARKit - Hand-picked curation of the coolest stuff made with ARKit
MasterpieceVR - Powerful VR sculpting & painting tool
SketchAR - Start drawing easily using augmented reality