kitio.aiStable Diffusion web UI vs ComfyUI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Stable Diffusion web UI is completely free, while ComfyUI is freemium.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Text-to-image and img2img
- Inpainting
- Extensions ecosystem
- Upscaling
- Prompt matrix and X/Y plots
- Node graph editor
- Custom nodes ecosystem
- Shareable workflows
- Video and 3D support
- Comfy Cloud
| Feature | Stable Diffusion web UI | ComfyUI |
|---|---|---|
| Best for | Popular open-source browser interface for local Stable Diffusion | Node-based open-source interface for building image AI workflows |
| Category | Image | Image |
| Pricing model | Free | Freemium |
| Starting price | Free | $20/mo |
| Free plan | Yes, fully free | Yes |
| Made by | AUTOMATIC1111 | Comfy Org |
| Based in | – | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Stable Diffusion web UI is completely free, while ComfyUI is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
5 plans
Free
Free
- Open-source local app
- 5 free cloud runs for new users
Standard
$20/mo
- 30-minute max workflow runtime
- 4 concurrent agent sessions
- Add credits anytime
Creator
$35/mo
- Import your own models
- 6 concurrent agent sessions
- 5 builds
Pro
$100/mo
- Workflow runtime up to 1 hour
- 8 concurrent agent sessions
- 10 builds
Team
$700/mo
- For teams sharing workflows
- Shared credit pool
- 16 concurrent agent requests
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Stable Diffusion web UI
- Free and fully local
- Huge extension library
- Familiar tab layout
- Slow to support new models
- Setup needs some tech skill
- Development has slowed
ComfyUI
- Maximum control over pipelines
- Supports new models quickly
- Free to run locally
- Steep learning curve
- Needs a capable GPU locally
- Custom nodes can break on updates
Which one should you choose?
Choose Stable Diffusion web UI if you want:
- Free and fully local
- Huge extension library
- Familiar tab layout
Watch out: slow to support new models.
Choose ComfyUI if you want:
- Maximum control over pipelines
- Supports new models quickly
- Free to run locally
Watch out: steep learning curve.
Stable Diffusion web UI vs ComfyUI FAQ
What is the difference between Stable Diffusion web UI and ComfyUI?
Stable Diffusion web UI: Popular open-source browser interface for local Stable Diffusion. ComfyUI: Node-based open-source interface for building image AI workflows. Both are image tools.
Is Stable Diffusion web UI or ComfyUI cheaper?
Stable Diffusion web UI is completely free, while ComfyUI is freemium.
Do Stable Diffusion web UI and ComfyUI have free plans?
Stable Diffusion web UI: Yes, fully free. ComfyUI: Yes.
Who makes Stable Diffusion web UI?
Stable Diffusion web UI is made by AUTOMATIC1111.
Who makes ComfyUI?
ComfyUI is made by Comfy Org, based in United States.
Which should I choose, Stable Diffusion web UI or ComfyUI?
Choose Stable Diffusion web UI if you value free and fully local and huge extension library. Choose ComfyUI if you value maximum control over pipelines and supports new models quickly.