head to head · open source
ComfyUI vs h2o-llmstudio
ComfyUI has 133,963 GitHub stars, 15,874 forks, 4,894 open issues and last shipped today. h2o-llmstudio has 5,183 stars, 557 forks, 36 open issues and last shipped 2 days ago. ComfyUI leads on adoption by 2,485% (133,963 vs 5,183 stars). ComfyUI is written in Python under GPL-3.0; h2o-llmstudio is written in Python under Apache-2.0. ComfyUI has attracted 12% as many forks as stars, h2o-llmstudio 11%. 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.
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Side by side
| ComfyUI | h2o-llmstudio | |
|---|---|---|
| GitHub stars | ★ 134K | ★ 5.2K |
| License | GPL-3.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-20 | 2026-09-18 |
| Forks | ⑂ 16K | ⑂ 557 |
| 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 h2o-llmstudio if
- You want the h2o-llmstudio feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and h2o-llmstudio 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 h2o-llmstudio
H2O LLM Studio is an Apache 2.0 Python framework with a no code graphical interface for fine tuning large language models, built for teams and individuals who want a custom LLM without writing training code yourself.
read the full h2o-llmstudio overview →
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Frequently asked questions
Is ComfyUI or h2o-llmstudio more popular?
ComfyUI has 133,963 GitHub stars and h2o-llmstudio has 5,183. ComfyUI has the larger community by that measure.
Are ComfyUI and h2o-llmstudio free?
Both are open source. ComfyUI is licensed under GPL-3.0 and h2o-llmstudio under Apache-2.0. Neither carries a licence fee.
What is the difference between ComfyUI and h2o-llmstudio?
ComfyUI is written in Python and h2o-llmstudio in Python. 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 h2o-llmstudio?
Choose ComfyUI if you want the larger community (133,963 stars) or its GPL-3.0 licence terms. Choose h2o-llmstudio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.