head to head · open source
Open WebUI vs h2o-llmstudio
Open WebUI has 152,426 GitHub stars, 22,301 forks, 294 open issues and last shipped today. h2o-llmstudio has 5,182 stars, 557 forks, 36 open issues and last shipped yesterday. Open WebUI leads on adoption by 2,841% (152,426 vs 5,182 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 | ★ 152K | ★ 5.2K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-18 | 2026-09-17 |
| Forks | ⑂ 22K | ⑂ 557 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Open WebUI if
- You weight community size — 152K 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 is a self hosted, open source AI interface that unifies access to local and cloud based large language models. It runs entirely in a web browser and supports Ollama for local model hosting alongside any OpenAI compatible API, including services like LMStudio, GroqCloud, Mistral, and OpenRouter. Built in Python, it functions as a drop in replacement for proprietary AI platforms, giving users full control over their model infrastructure and data.
read the full Open WebUI 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 Open WebUI or h2o-llmstudio more popular?
Open WebUI has 152,426 GitHub stars and h2o-llmstudio has 5,182. 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 (152,426 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.