The best alternatives to Threedio are Womp, Rooms, and Lost Geometry. If these 3 options don't work for you, we've listed a few more alternatives below.
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Womp makes 3D easy for anyone, with any computer. No downloads, or gray apps with a million buttons, just your browser & creativity. With Womp's revolutionary real-time goopy 3D, anyone can make mind-blowing renders, animations, & even 3D prints. Wanna Womp?
Rooms lets you create games + interactive experiences from desktop web, iPhone and iPad. Every thing you see is editable and scriptable. And best of all, it’s free :-).
Huge set of 91 abstract 3D objects in various styles. Bring a modern touch to your interfaces with these vivid 3D objects, carefully crafted in Blender. There are 4 styles available: matte, clay, glass, and black. PNG version is available for free.
Stable Video 3D is a generative model based on Stable Video Diffusion advancing the field of 3D technology, delivering greatly improved quality and multi-view. It is available now for commercial and non-commercial use with a Stability AI Membership.