ComfyUI

Free
API Available

Node-based visual workflow engine for Stable Diffusion and generative AI

Comfy Org · Image Generation Launched Jan 2023

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Quick Answer

ComfyUI is node-based visual workflow engine for stable diffusion and generative ai, made by Comfy Org. It is free and open source. Key uses: Advanced image generation, Custom diffusion pipelines, Video generation workflows.

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Users
65K+ GitHub stars; de facto standard for advanced diffusion workflows

What is ComfyUI?

ComfyUI is a powerful open-source, node-based graphical interface for building and running image, video, and audio generation pipelines. Using a modular graph/flowchart of nodes, users have granular control over every step of the diffusion process. It supports Stable Diffusion, SDXL, SD 3.5, FLUX, and video models, and has become the de facto tool for advanced generative AI creators and researchers.

What's new in ComfyUI in 2026?

Comfy Org formed to steward the project (2024); ComfyUI Desktop app launched; native FLUX and SD 3.5 support; ComfyUI Node Registry & Manager; API nodes for cloud models; 65K+ GitHub stars; powers many commercial AI art backends

How much does ComfyUI cost?

Open-Source

$0

  • Full node-based engine
  • GPL-3.0 license
  • All custom nodes
  • Local GPU inference
  • API mode

What can you do with ComfyUI?

  • Advanced image generation
  • Custom diffusion pipelines
  • Video generation workflows
  • Batch processing
  • Research and experimentation
  • ControlNet compositing

Pros

  • Completely free and open-source
  • Granular workflow control
  • Runs locally (privacy)
  • Huge custom-node ecosystem
  • Supports FLUX, SD 3.5, video models
  • Shareable/reproducible workflows

Cons

  • Steep learning curve
  • Node graphs get complex fast
  • Requires capable GPU
  • Less beginner-friendly than A1111

Specs

Underlying Models

  • Stable Diffusion 3.5
  • SDXL
  • FLUX.1
  • Stable Video Diffusion
  • Any diffusion checkpoint

Platforms

  • Windows
  • macOS
  • Linux
  • ComfyUI Desktop
  • Cloud (RunComfy, etc.)

Integrations

  • Hugging Face
  • Civitai
  • ControlNet
  • LoRA/embeddings
  • FLUX
  • custom node registry

Ideal For

  • Advanced AI artists
  • Researchers
  • Studios building custom pipelines
  • Developers embedding generation backends

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What are the best alternatives to ComfyUI?

Compare ComfyUI Head-to-Head

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Frequently Asked Questions about ComfyUI

How much does ComfyUI cost?

ComfyUI pricing: Open-Source at $0.

Is ComfyUI free?

Yes, ComfyUI is fully free and open source.

What is ComfyUI used for?

ComfyUI is used for: Advanced image generation, Custom diffusion pipelines, Video generation workflows, Batch processing, Research and experimentation, ControlNet compositing.

What are the best alternatives to ComfyUI?

Top alternatives to ComfyUI include Midjourney, Stable Diffusion, Flux.

What platforms does ComfyUI support?

ComfyUI is available on: Windows, macOS, Linux, ComfyUI Desktop, Cloud (RunComfy, etc.).