ComfyUI

advancedwidespread

A free, open-source program in which you assemble how artificial intelligence creates images, videos, or audio by connecting boxes with lines.

In plain terms

Most image generators are like a vending machine: you type what you want, press the button, and the result comes out. ComfyUI is more like a kitchen where you assemble the recipe. Each step is a separate box on the screen, and you decide what follows what.

You connect boxes (called nodes in the program's terminology) with lines, forming a flowchart. One box loads the model, another receives your text instruction, a third generates the image, and a fourth saves it. If something is unsatisfactory, you only replace or adjust that single box.

This is what makes it different from browser-based services: it typically runs on your own machine, handles many open models, and you can see exactly what happens to the image at each step. In return, you must learn: at first encounter, the many boxes and lines can be intimidating.

The completed workflow can be saved and shared, so the community publishes countless ready-made "recipes." You load these and adapt them to your own idea.

How it works

You download the program and the models you wish to use (for example, open models that generate images or videos). These are multi-gigabyte files.
On the canvas, you place boxes, each performing an operation: loading a model, interpreting text instructions, generating the image, upscaling, and saving.
You connect the output of one box to the input of the next, creating a workflow, which is the sequence in which the machine operates.
At startup, the program goes through the chain. If you later modify only one box, it typically recalculates only the steps dependent on it, allowing faster experimentation.
You save the completed workflow to a file. By default, the program also embeds it in the generated image file, so if someone opens the image in ComfyUI, they get the entire workflow back. This is lost if you convert the image or upload it to a site that strips the metadata attached to the image.

An everyday example

You run an online shop and want a uniform, atmospheric background for 100 product photos. In ComfyUI, you set up the process once (background removal, new background generation, resizing), after which the images go through it in sequence, and you do not need to handle each one individually.

Who is affected

marketerWith a process built once, you can produce campaign images and short videos in series with a uniform style. → Marketing

entrepreneur, executiveRunning on your own machine means you do not pay per image, and your materials do not go to an external provider.

developerWorkflows can also be launched from a program, allowing you to integrate image generation into your own application or an agent's tools. → Code

parent, student, teacherIt vividly shows the steps involved in image generation, making it good for learning and teaching. → Education & Family

A common misconception

MythComfyUI is the artificial intelligence that creates the images.

In realityComfyUI is only the workshop and control panel. The image is generated by separately downloaded models, and the quality of the result depends mainly on them and your settings.

Limits and risks

It is difficult to use without a powerful graphics card: it runs very slowly on weaker machines, and larger video models often fail to start on them.
The learning curve is steep; it takes longer to reach a usable result than with a browser-based image generator.
Community extensions run foreign code on your machine, and there have been cases of malicious extensions, so install only from trusted sources.
The program is free, but the models have their own licenses: check what is permitted before using them commercially.

Similar, but not the same

Stable Diffusion – Stable Diffusion is a family of image-generation models, while ComfyUI is the interface in which you can run these and other models.
Midjourney – Midjourney is a closed, subscription-based cloud service with its own model, while ComfyUI is an open program you can run on your own machine with freely chosen models.
Automatic1111 (Stable Diffusion WebUI) – The Automatic1111 interface resembles a form with sliders and buttons, while in ComfyUI you build the entire process from boxes.

Related concepts

Broader

generative AI, image generation, open-source software

Narrower

node, munkafolyamat, custom node

On the edge

Stable Diffusion, diffusion model, LoRA, ControlNet, video generation

A brief history

ComfyUI was released on GitHub in January 2023 as the work of a developer known as comfyanonymous. It quickly became a favorite tool in the open image generation community because it usually supported new models early. Development has been coordinated since 2024 by a company called Comfy Org, and the program remains open source.

Where things stand

At the end of 2026, it is a core tool for creators and studios working with open models, used for images, video, and audio alike. It has an installable desktop version and a paid cloud version accessible via browser, but the general public still prefers simpler browser-based services.

Status: 2026 November

Also known as

ComfyUI · Comfy UI · Comfy · ComfyUI workflow · ComfyUI munkafolyamat · ComfyUI Desktop

Sources

This entry was machine-edited and has undergone machine expert review; the “In the news” section updates automatically from Agent Age stories.