head to head · open source
ComfyUI vs vellum-assistant
ComfyUI has 133,963 GitHub stars, 15,874 forks, 4,894 open issues and last shipped today. vellum-assistant has 1,292 stars, 187 forks, 179 open issues and last shipped yesterday. ComfyUI leads on adoption by 10,269% (133,963 vs 1,292 stars). ComfyUI is written in Python under GPL-3.0; vellum-assistant is written in TypeScript under MIT. ComfyUI has attracted 12% as many forks as stars, vellum-assistant 14%. ComfyUI was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| ComfyUI | vellum-assistant | |
|---|---|---|
| GitHub stars | ★ 134K | ★ 1.3K |
| License | GPL-3.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-20 | 2026-09-19 |
| Forks | ⑂ 16K | ⑂ 187 |
| 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 vellum-assistant if
- You want the vellum-assistant feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and vellum-assistant 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 vellum-assistant
Vellum Assistant is an MIT licensed, TypeScript personal AI assistant for individuals and small teams who want a persistent, self improving agent that runs across desktop, mobile, web, voice, email, Telegram, Slack and Twilio without building the memory and orchestration layer themselves.
read the full vellum-assistant overview →
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Frequently asked questions
Is ComfyUI or vellum-assistant more popular?
ComfyUI has 133,963 GitHub stars and vellum-assistant has 1,292. ComfyUI has the larger community by that measure.
Are ComfyUI and vellum-assistant free?
Both are open source. ComfyUI is licensed under GPL-3.0 and vellum-assistant under MIT. Neither carries a licence fee.
What is the difference between ComfyUI and vellum-assistant?
ComfyUI is written in Python and vellum-assistant 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 vellum-assistant?
Choose ComfyUI if you want the larger community (133,963 stars) or its GPL-3.0 licence terms. Choose vellum-assistant if its feature set, stack or MIT licence fits better. Both are self-hostable.