Question: Is there a web-based platform that allows me to create 3D models in various formats, including STL?

Meshy is a 3D AI toolkit that lets you generate models with text prompts or 2D images. It can render in a variety of art styles and export models in formats like FBX, OBJ, BLEND, USDZ and STL. Its automated PBR map generation and API for browser preview make it a good choice for AR/VR, gaming and digital design.

Another option is 3D AI Studio, which also can convert text or images into 3D assets. It can export in several formats, including STL, OBJ, FBX, GLB and USD. Its interface is designed to be easy to use, and the speed of generation makes it a good option for game developers and animators.

gNucleus is another option that uses GenAI to convert text prompts into CAD models. It can generate 3D models quickly in formats like STL, and has features like GenAI Aided 3D Design to help both beginners and experts. Its web API is useful for direct model creation and manipulation.

If you want a highly customizable option, Sloyd can generate 3D models with text prompts using AI. It can automatically generate UV-unwrapping and LODs, and can create real-time 3D models with an SDK for integration into tools like Unity. That makes it a good option for game developers and designers who need high-quality, customizable 3D models.