ComfyUI

ComfyUI is a free, open-source, node-based interface for designing and executing generative-AI diffusion pipelines for images, video, and audio through a visual flowchart of connectable nodes. It's aimed at technically-inclined creators, developers, and power users who want full control over every stage of a Stable Diffusion workflow rather than a simplified prompt box. What most sets it apart is that it exposes the entire pipeline as an editable graph and re-executes only the parts that change, giving unmatched flexibility and efficiency at the cost of a steeper learning curve.