I played around with both after reading this article, and while you're right that there's a big resemblance, that sketchfab is very fast, and supports lots of f

I played around with both after reading this article, and while you're right that there's a big resemblance, that sketchfab is very fast, and supports lots of formats, verold seems a fair bit more sophisticated in what you can do: the material editing in verold seems to support many more types of materials, and as best as I could tell, verold allows multiple uploaded meshes to be positioned within a single model, whereas sketchfab is limited to a single mesh upload. Both are fundamentally rather limited though, more like "model tweakers" than real editors, as you can't create new shapes / meshes in them or edit the geometry of existing meshes.