ComfyUI

ComfyUI is a node-graph GUI, API, and backend for diffusion models: instead of a single prompt box, you wire nodes into a workflow and run it. Images, video, 3D models, and audio all come out of the same interface, with every model, parameter, and output under your hand. The latest open-source state-of-the-art models are supported natively, and API nodes reach closed models such as Nano Banana, Seedance, and Hunyuan3D from inside the same graph.

It runs locally on Windows, Linux, and macOS as a desktop app, a portable package, or a manual install, and on Comfy's cloud if you prefer. App Mode can put a simple UI in front of a complicated workflow, and API endpoints drop the whole thing into a production pipeline. The project calls itself the most powerful and modular AI engine for content creation; it is GPL-3.0 licensed with more than 125,000 GitHub stars.