head to head · open source
Open WebUI vs h2o-llmstudio
Open WebUI has 157,575 GitHub stars, 22,923 forks, 294 open issues and last shipped yesterday. h2o-llmstudio has 5,191 stars, 556 forks, 36 open issues and last shipped 7 days ago. Open WebUI leads on adoption by 2,936% (157,575 vs 5,191 stars). Open WebUI is written in Python under a custom or non-standard licence; h2o-llmstudio is written in Python under Apache-2.0. Open WebUI has attracted 15% as many forks as stars, h2o-llmstudio 11%. Open WebUI was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, llm), 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
| Open WebUI | h2o-llmstudio | |
|---|---|---|
| GitHub stars | ★ 158K | ★ 5.2K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-02 | 2026-10-27 |
| Forks | ⑂ 23K | ⑂ 556 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Open WebUI if
- You weight community size — 158K stars and counting
- You want the Custom / other 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 Open WebUI
Open WebUI 👋 Open WebUI is a home for AI , a self hosted AI platform that's extensible , feature rich , user friendly, and built to run entirely offline . With support for Ollama and OpenAI compatible APIs , it gives you a powerful, provider agnostic interface for both local and cloud based models. Passionate about open source AI? Join our team → [!TIP] Looking for an Enterprise Plan? – Speak with Our Sales Team Today! For more information, be sure to check out our Open WebUI Documentation. Key Features of Open WebUI ⭐ 🚀 Effortless Setup : Install seamlessly via pip, uv, Docker, or Kubernetes (kubectl…
read the full Open WebUI 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 Open WebUI or h2o-llmstudio more popular?
Open WebUI has 157,575 GitHub stars and h2o-llmstudio has 5,191. Open WebUI has the larger community by that measure.
Are Open WebUI and h2o-llmstudio free?
Both are open source. Open WebUI has no licence declared in this registry, and h2o-llmstudio is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Open WebUI and h2o-llmstudio?
Open WebUI 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, Open WebUI or h2o-llmstudio?
Choose Open WebUI if you want the larger community (157,575 stars) or its Custom / other licence terms. Choose h2o-llmstudio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.