head to head · open source
stable-diffusion-webui vs Leon
stable-diffusion-webui has 165,228 GitHub stars, 31,916 forks, 2,510 open issues and last shipped 8 months ago. Leon has 17,629 stars, 1,479 forks, 112 open issues and last shipped yesterday. stable-diffusion-webui leads on adoption by 837% (165,228 vs 17,629 stars). stable-diffusion-webui is written in Python under AGPL-3.0; Leon is written in TypeScript under MIT. stable-diffusion-webui has attracted 19% as many forks as stars, Leon 8%. Leon was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| stable-diffusion-webui | Leon | |
|---|---|---|
| GitHub stars | ★ 165K | ★ 18K |
| License | AGPL-3.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-03-02 | 2026-11-02 |
| Forks | ⑂ 32K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick stable-diffusion-webui if
- You weight community size — 165K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Leon if
- You want the Leon feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Leon fits your workflow better
About stable-diffusion-webui
Stable Diffusion web UI A web interface for Stable Diffusion, implemented using Gradio library. Features Detailed feature showcase with images: Original txt2img and img2img modes One click install and run script (but you still must install python and git) Outpainting Inpainting Color Sketch Prompt Matrix Stable Diffusion Upscale Attention, specify parts of text that the model should pay more attention to a man in a ((tuxedo)) will pay more attention to tuxedo a man in a (tuxedo:1.21) alternative syntax select text and press Ctrl+Up or Ctrl+Down (or Command+Up or Command+Down if you're on a MacOS) to…
read the full stable-diffusion-webui overview →
About Leon
Leon Your open source personal AI assistant. I share Leon progress most regularly on X / @grenlouis Follow progress on X / @grenlouis · Website · Newsletter · Roadmap · Story ⚠️ Important Notice (as of 2026 03 29) [!IMPORTANT] Leon is currently focused on the 2.0 Developer Preview on the develop branch. The new documentation is not ready yet . The current docs site and older guides mostly reflect the legacy architecture. If you want the legacy, more stable pre agentic version of Leon, use the master branch. If you want to explore or contribute to Leon's new core, develop is the right place. The most accurate…
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Frequently asked questions
Is stable-diffusion-webui or Leon more popular?
stable-diffusion-webui has 165,228 GitHub stars and Leon has 17,629. stable-diffusion-webui has the larger community by that measure.
Are stable-diffusion-webui and Leon free?
Both are open source. stable-diffusion-webui is licensed under AGPL-3.0 and Leon under MIT. Neither carries a licence fee.
What is the difference between stable-diffusion-webui and Leon?
stable-diffusion-webui is written in Python and Leon in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, stable-diffusion-webui or Leon?
Choose stable-diffusion-webui if you want the larger community (165,228 stars) or its AGPL-3.0 licence terms. Choose Leon if its feature set, stack or MIT licence fits better. Both are self-hostable.