ComfyUI raises $30M at $500M valuation for node-based AI tools

ComfyUI, a startup that helps creators control image, video, and audio outputs from diffusion models—a class of generative AI models used for image, video, and audio—has raised a $30 million funding round. The financing values the company at $500 million.

The funding round was led by Craft Ventures, with participation from:

• Pace Capital
• Chemistry
• TruArrow

The project originally started as an open-source project in 2023, shortly after the introduction of diffusion models. It has since transitioned into a commercial entity. In late 2024, ComfyUI raised $19 million in Series A financing to support its growth. Investors in that previous round included Chemistry Ventures, Cursor Capital, and Guillermo Rauch, the founder of Vercel.

ComfyUI’s core offering is a node-based workflow, which is an interface allowing users to link specific components of the generation process. This modular framework stands in contrast to traditional prompt-based solutions, which are AI tools where users input text prompts to generate output. According to Yoland Yan, ComfyUI’s co-founder and CEO, prompt-based models like Midjourney or OpenAI’s DALL-E often fall short of professional requirements. Yan noted that typical prompt-based solutions only get 60% to 80% of the way to a desired output. To change the remaining 20%, users must repeatedly prompt the model, a process Yan compared to playing a slot machine because small changes can completely alter the output. He explained that creators cannot easily convey specific instructions in the prompt box of a foundational model.

By allowing creators to link specific components of the generation process, ComfyUI provides granular control over the final output. The platform has gained significant traction, claiming over 4 million users. Yan expects the demand for human-in-the-loop approaches—where human intervention is required in the AI generation process—to grow as low-quality AI-generated content becomes ubiquitous. “In the world where AI slop is going to be everywhere, the Comfy version of human-in-the -loop approach is going to win out most of the eyeballs in the end,” said Yoland Yan, ComfyUI’s co-founder and CEO. The startup’s competitors in the space include Weavy, a company that was acquired by Figma.

Why it matters

ComfyUI’s node-based framework addresses the “last mile” problem in generative AI, where prompt-based models often fail to deliver precise results, positioning the company as a critical tool for professional creators.