ComfyUI , a startup that helps creators control image, video, and audio outputs from diffusion models with a node-based workflow, has raised a $30 million funding round at a $500 million valuation. The round was led by Craft Ventures, with participation from other investors including Pace Capital, Chemistry, and TruArrow. ComfyUI was started as an open source project in 2023 shortly after the introduction of diffusion models. At that time, models like Midjourney and OpenAI’s DALL-E were barely functional, frequently making major mistakes, such as adding extra fingers to hands. To address these limitations, the project founders developed a modular framework that gives creators granular control over every step of the generation process. Their tool gained such significant traction among creative professionals that it eventually evolved into a formal startup.…