What are some alternatives?
When comparing A-Painter and Sketchfab Download API, you can also consider the following products
Tilt Brush by Google - Paint in spaces around you with Virtual Reality
MasterpieceVR - Powerful VR sculpting & painting tool
VR Sketch - A tool for designers to draw inside virtual reality
Oculus Medium - Sculpt, model and paint in virtual reality on a 3D canvas.
Insite VR - The easiest way to view your 3D models in VR
SprayPrinter - Convert digital designs into wall art from your smartphone