head to head · open source
ComfyUI vs h2o-llmstudio
ComfyUI has 144,907 GitHub stars, 17,244 forks, 4,894 open issues and last shipped today. h2o-llmstudio has 5,193 stars, 556 forks, 36 open issues and last shipped yesterday. ComfyUI leads on adoption by 2,690% (144,907 vs 5,193 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 | ★ 145K | ★ 5.2K |
| License | GPL-3.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 17K | ⑂ 556 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ComfyUI if
- You weight community size — 145K 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 The most powerful and modular AI engine for content creation. [![Website][website shield]][website url] [![Dynamic JSON Badge][discord shield]][discord url] [![Twitter][twitter shield]][twitter url] [![Matrix][matrix shield]][matrix url] [![][github release shield]][github release link] [![][github release date shield]][github release link] [![][github downloads shield]][github downloads link] [![][github downloads latest shield]][github downloads link] [matrix shield]: [matrix url]: [website shield]: [website url]: [discord shield]: [discord url]: [twitter shield]: [twitter url]: [github release…
read the full ComfyUI overview →
About h2o-llmstudio
Welcome to H2O LLM Studio, a framework and no code GUI designed for fine tuning state of the art large language models (LLMs). Jump to With H2O LLM Studio, you can Quickstart What's New Setup Recommended Install Virtual Environments Run H2O LLM Studio GUI Run H2O LLM Studio GUI using Docker Run H2O LLM Studio with command line interface (CLI) Troubleshooting Data format and example data Training your model Example: Run on OASST data via CLI Model checkpoints Documentation Contributing License With H2O LLM Studio, you can easily and effectively fine tune LLMs without the need for any coding experience . use a…
read the full h2o-llmstudio overview →
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Frequently asked questions
Is ComfyUI or h2o-llmstudio more popular?
ComfyUI has 144,907 GitHub stars and h2o-llmstudio has 5,193. 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 (144,907 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.