How to install ComfyUI

ComfyUI is a node-based user interface for Stable Diffusion. It’s gaining popularity among Stable Diffusion users. Developers and artists widely use it because it is extremely configurable.

It is a great alternative to more traditional Stable Diffusion GUIs like AUTOMATIC1111 and SD.Next.

This guide covers installing ComfyUI on Windows and Mac.

See the Beginner’s Guide for using ComfyUI.

Benefits of ComfyUI

Why using ComfyUI? It’s a different experience from other GUIs. ComfyUI stands out in the following areas.

1. Lightweight

Unlike other full-feature GUIs such as AUTOMATIC1111, ComfyUI only loads what is necessary. This results in lower memory usage and faster generations.

2. Flexible

ComfyUI is very configurable. You can easily generate two images with different CFG scales in a single workflow and compare the results.

3. You know what it is doing

If you have a good knowledge of how Stable Diffusion works, ComfyUI shows you exactly what it does. No more guessworks.

4. Easy to share workflows

Instead of writing a description of what buttons to click, you can save a workflow and share with someone else.

5. Good for prototyping

It’s a godsend for developers because you can prototype a workflow before coding it for production.

Installing ComfyUI on Windows

Two options to install ComfyUI on Windows:

1. Standalone zip
2. Manual installation

If you are not a developer of ComfyUI, you should use option 1. Option 2 is for folks who like to tinker with codes.

I will only go over option 1 here. Consult this guide for option 2.

Step 1: Install 7-Zip

You see 7-zip to uncompress ComfyUI’s zip file.

Download 7-zip on this page or use this direct download link.

Double-click to run the downloaded exe file. Click Install to install 7-zip on your PC.

Step 2: Download the standalone version of ComfyUI

Download ComfyUI with this direct download link.

When it is done, right-click on the file ComfyUI_windows_portable_nvidia_cu118_or_cpu.7z, select Show More Options > 7-Zip > Extract Here.

Your PC should be working hard for a while. When it is done, there should be a new folder called ComfyUI_windows_portable.

Feel free to move this folder to a location you like.

Step 3: Download a checkpoint model

You need a checkpoint model to start using ComfyUI.

You have two options: (1) download a model, or (2) share models with other Stable Diffusion GUI such as AUTOMATIC1111.

Feel free to download any model. Here’s the download link for the DreamShaper 8 model.

Put the model in the folder

ComfyUI_windows_portable\ComfyUI\models\checkpoints

Step 4: Start ComfyUI

If you have an Nvidia GPU: Double-click run_nvidia_gpu.bat to start ComfyUI.

If you don’t: Double-click run_cpu.bat to run ComfyUI slooowly…

ComfyUI should automatically start on your browser.

Updating ComfyUI on Windows

To update ComfyUI, double-click to run the file ComfyUI_windows_portable > update > update_comfyui.bat.

Installing ComfyUI on Mac M1/M2

Installing ComfyUI on Mac is a bit more involved. You will need MacOS 12.3 or higher for MPS acceleration support.

Click on the Apple icon at the top left corner and select About this Mac to check.

The following steps install ComfyUI in a virtual environment.

Step 1: Install HomeBrew

 Homebrew is a package manager for Mac. Open the Terminal app, paste the following command, and press return.

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Step 2: Install a few required packages

Open a new terminal and run the following command

brew install cmake protobuf rust [email protected] git wget

Step 3: Clone ComfyUI

Clone the ComfyUI code on your local storage by running the following in Terminal.

git clone https://github.com/comfyanonymous/ComfyUI

Step 3: Install ComfyUI

Now go into ComfyUI’s directory.

cd ComfyUI

Create a virtual environment.

python -m venv venv

Install PyTorch in the virtual environment.

./venv/bin/pip install torch torchvision torchaudio

Install the required packages for CompfyUI.

./venv/bin/pip install -r requirements.txt

Step 4. Download a stable diffusion model

You will need a model to run Stable Diffusion. Use the following link to download the v1.5 model.

Download link

Put the checkpoint model in the folder models/checkpoints.

Alternatively, run the following command to download the model.

 wget -P models/checkpoints https://huggingface.co/runwayml/stable-diffusion-v1-5/resolve/main/v1-5-pruned-emaonly.ckpt

Step 5: Start ComfyUI

Start ComfyUI by running the following command.

./venv/bin/python main.py

Updating ComfyUI on Mac

Run the following command in the comfyUI folder to update ComfyUI:

git pull

Generating an image

After starting ComfyUI for the very first time, you should see the default text-to-image workflow. It should look like this:

If this is not what you see, click Load Default on the right panel to return this default text-to-image workflow.

1. Selecting a model

First, select a Stable Diffusion Checkpoint model in the Load Checkpoint node. Click on the model name to show a list of available models.

If the node is too small, you can use the mouse wheel or pinch with two fingers on the touchpad to zoom in and out.

If clicking the model name does nothing, you may not have installed a model or configured it to use your existing models in A1111. Go back to the installation section to fix it first.

2. Enter a prompt and a negative prompt

You should see two nodes with the label CLIP Text Encode (Prompt). Enter your prompt in the top one and your negative prompt in the bottom one.

3. Generate an image

Click Queue Prompt to run the workflow. After a short wait, you should see the first image generated.

Sharing models between AUTOMATIC1111 and ComfyUI

If you have AUTOMATIC1111 Stable Diffusiion WebUI installed on your PC, you should share the model files between AUTOMATIC1111 and ComfyUI. Otherwise, you will have a very full hard drive…

Rename the file ComfyUI_windows_portable > ComfyUI > extra_model_paths.yaml.example to extra_model_paths.yaml.

Change this line:

base_path: path/to/stable-diffusion-webui/

Replace path/to/stable-diffusion-webui/ to your actual path to it. E.g.

base_path: C:\Users\USERNAME\stable-diffusion-webui

Restart ComfyUI completely. If the configuration is correct, you should see the full list of your model by clicking the ckpt_name field in the Load Checkpoint node.

You can use this technique to share LoRA, textual inversions, etc between AUTOMATIC1111 and ComfyUI.