The power-user's Stable Diffusion UI. Free, open-source, infinitely extensible.
ComfyUI is the free, open-source Stable Diffusion frontend that pros actually use. Instead of clicking through forms, you wire up nodes (load model → prompt → sampler → upscale → save) like a visual programming environment. The learning curve is real. The payoff is total control: you can chain any model, any LoRA, any ControlNet, any workflow anyone has ever shared. The community shares thousands of JSON workflows on Civitai.
Who it's for: AI artists who want to run SD, Flux, Hunyuan, Wan, and Stable Video locally. Power users who want reproducible workflows. Anyone who needs features Automatic1111 doesn't expose. Not for casual users — try Midjourney or Leonardo instead.
MIT-licensed, runs on your GPU, no cloud, no per-image cost, no rate limits. Generate 10,000 images a day if your GPU can handle it. Only cost is your electricity and hardware.
Drag-and-drop nodes to build generation pipelines. Save as JSON, share with the community, run on different machines. Reproducibility is built in — same seed, same image.
Stable Diffusion 1.5, SDXL, SD3, Flux, Hunyuan, AuraFlow, Kolors, Lumina, plus community fine-tunes. LoRAs, ControlNets, IP-Adapter, AnimateDiff, SVD — all work natively.
Up to 2x faster image generation than Automatic1111, less VRAM usage, smarter caching. Smart queuing means you can queue 100 prompts and walk away.
ComfyUI is the de-facto standard for serious AI image and video work in 2026. If you're tired of paying $30/mo to Leonardo for features you can run locally, and you have a GPU with 8GB+ VRAM, switch to ComfyUI. Total cost of ownership is $0 forever, and the workflow ecosystem is unmatched. Start with a shared workflow from Civitai — don't try to build from scratch.