head to head · open source
stable-diffusion-webui vs sim
stable-diffusion-webui has 165,235 GitHub stars, 31,912 forks, 2,510 open issues and last shipped 8 months ago. sim has 29,983 stars, 3,883 forks, 336 open issues and last shipped yesterday. stable-diffusion-webui leads on adoption by 451% (165,235 vs 29,983 stars). stable-diffusion-webui is written in Python under AGPL-3.0; sim is written in TypeScript under Apache-2.0. stable-diffusion-webui has attracted 19% as many forks as stars, sim 13%. sim 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 | sim | |
|---|---|---|
| GitHub stars | ★ 165K | ★ 30K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-03-02 | 2026-11-04 |
| Forks | ⑂ 32K | ⑂ 3.9K |
| 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 sim if
- You want the sim feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and sim 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 sim
A workspace to build, deploy and manage AI agents and workflows. Quickstart Cloud hosted: sim.ai Self hosted Open Desktop: macOS macOS 12+, Apple Silicon and Intel. See the desktop docs to point it at a self hosted deployment. Capabilities Connect 1,000+ integrations and every major LLM Add Slack, Notion, HubSpot, Salesforce, databases, and more Build agents visually, conversationally, or with code Ingest files, knowledge bases, and structured table data Monitor runs, logs, schedules, and workflow activity One workspace, every surface Chat and workflows are just the start — tables, files, and knowledge all live…
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Frequently asked questions
Is stable-diffusion-webui or sim more popular?
stable-diffusion-webui has 165,235 GitHub stars and sim has 29,983. stable-diffusion-webui has the larger community by that measure.
Are stable-diffusion-webui and sim free?
Both are open source. stable-diffusion-webui is licensed under AGPL-3.0 and sim under Apache-2.0. Neither carries a licence fee.
What is the difference between stable-diffusion-webui and sim?
stable-diffusion-webui is written in Python and sim 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 sim?
Choose stable-diffusion-webui if you want the larger community (165,235 stars) or its AGPL-3.0 licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.