head to head · open source
ComfyUI vs Leon
ComfyUI has 133,963 GitHub stars, 15,874 forks, 4,894 open issues and last shipped today. Leon has 17,527 stars, 1,469 forks, 112 open issues and last shipped 3 days ago. ComfyUI leads on adoption by 664% (133,963 vs 17,527 stars). ComfyUI is written in Python under GPL-3.0; Leon is written in TypeScript under MIT. ComfyUI has attracted 12% as many forks as stars, Leon 8%. ComfyUI 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.
← all 20902 open source comparisons
Side by side
| ComfyUI | Leon | |
|---|---|---|
| GitHub stars | ★ 134K | ★ 18K |
| License | GPL-3.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-20 | 2026-09-17 |
| Forks | ⑂ 16K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ComfyUI if
- You weight community size — 134K stars and counting
- You want the GPL-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 ComfyUI
ComfyUI is a GPL 3.0 licensed Python and PyTorch node graph application, local API, and backend for running diffusion models across image, video, audio, 3D, and text workflows, built for visual professionals who want control over every model, parameter, and output, and for developers who embed those workflows into production pipelines.
read the full ComfyUI overview →
About Leon
Leon is open source personal AI assistant. It lives in Node.js and TypeScript ecosystem, under AI Interaction & Interfaces category. Project builds around tools, context, memory, and agentic execution. It aims to stay practical, privacy aware, and grounded in real environment. Leon can operate locally, use dedicated tools instead of relying on free form guessing, and complete tasks from start to finish across deterministic workflows and agent style execution.
More in AI & Machine Learning
Related comparisons
More AI Interaction & Interfaces projects
Compare either of these against the rest of the AI Interaction & Interfaces field.
Frequently asked questions
Is ComfyUI or Leon more popular?
ComfyUI has 133,963 GitHub stars and Leon has 17,527. ComfyUI has the larger community by that measure.
Are ComfyUI and Leon free?
Both are open source. ComfyUI is licensed under GPL-3.0 and Leon under MIT. Neither carries a licence fee.
What is the difference between ComfyUI and Leon?
ComfyUI 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, ComfyUI or Leon?
Choose ComfyUI if you want the larger community (133,963 stars) or its GPL-3.0 licence terms. Choose Leon if its feature set, stack or MIT licence fits better. Both are self-hostable.