I've been using p3d.in for a while now and it's fantastic — 5 stars!

The upload and sharing process is incredibly simple, and the viewer is smooth and responsive even on mobile. I love how easy it is to add annotations and hotspots to guide viewers through models, and the ability to stack extra codes for more storage (up to 10) made scaling my projects straightforward and affordable.

Customer support and documentation are clear, and the embed options let me showcase models seamlessly across websites and presentations. Perfect for quick prototypes, client demos, and product mockups — highly recommended!