What are some alternatives?
When comparing MasterpieceVR and Sketchfab Download API, you can also consider the following products
Tilt Brush by Google - Paint in spaces around you with Virtual Reality
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
A-Painter - Paint in VR in your Browser
Snap Art - Snap's augmented reality platform