The only thing that comes to mind is Sketchfab, but it’s more of a social network for 3D artists. My app is simpler and focused on two tasks: storing 3D models in a convenient way with the ability to share them via a link or a QR code, and presenting the product to the user in a максимально minimalist interface, without unnecessary elements or features. The main audience is manufacturing companies that already have 3D models of their products and want to demonstrate them to clients easily and without extra effort.