The nodal workflow engine for serious diffusion.
Open Source
Visit ComfyUI Actually FreeNo SignupOpen Source
Updated 2026-05-19
ComfyUI vs AUTOMATIC1111 vs InvokeAI
Which diffusion workflow engine should you commit to?
ComfyUI wins on flexibility and new-model support. A1111 wins on extension breadth. InvokeAI wins on production polish and canvas-first work.
The original SD power-user webUI.
Open Source
Visit AUTOMATIC1111 (stable-diffusion-webui) Actually FreeNo SignupOpen Source
Production-leaning SD studio with canvas & batch.
Open Source
Visit InvokeAI Actually FreeNo SignupOpen Source
The nodal workflow engine for serious diffusion. | The original SD power-user webUI. | Production-leaning SD studio with canvas & batch. | |
|---|---|---|---|
| Pricing | Open Source | Open Source | Open Source |
| Free tier | Fully free and open source. You provide the hardware (or rent a GPU pod). | Fully free / open source. Hundreds of community extensions. | Community edition is free + OSS. Paid Pro tier for teams. |
| Best for | Most flexible diffusion pipeline anywhere | Approachable forms-based UI | Best canvas in OSS SD |
| Watch out for | Steep learning curve — graph thinking required | Slower to adopt new models | Smaller plugin ecosystem than A1111 |
| Platforms | windows, mac, linux, docker, cli | windows, mac, linux, cli | windows, mac, linux, docker |
| Min VRAM | 6 GB | 4 GB | 8 GB |
| Rec. VRAM | 16 GB | 12 GB | 16 GB |
| Compute | local | local | local |
| Power score | 98/100 | 88/100 | 84/100 |
| Verified badges | Actually FreeNo SignupOpen SourceWatermark-FreeHobbyist-FriendlyWorkflow Engine | Actually FreeNo SignupOpen SourceWatermark-FreeHobbyist-FriendlyAPIWorkflow Engine | Actually FreeNo SignupOpen SourceWatermark-FreeHobbyist-FriendlyAPIWorkflow Engine |
| Visit ComfyUI | Visit AUTOMATIC1111 (stable-diffusion-webui) | Visit InvokeAI |