head to head · open source
Open WebUI vs nanobot
Open WebUI has 152,394 GitHub stars, 22,296 forks, 294 open issues and last shipped yesterday. nanobot has 48,274 stars, 8,533 forks, 775 open issues and last shipped yesterday. Open WebUI leads on adoption by 216% (152,394 vs 48,274 stars). Open WebUI is written in Python under a custom or non-standard licence; nanobot is written in Python under MIT. Open WebUI has attracted 15% as many forks as stars, nanobot 18%. nanobot was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (llms, mcp), 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 | nanobot | |
|---|---|---|
| GitHub stars | ★ 152K | ★ 48K |
| License | Custom / other | MIT |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 22K | ⑂ 8.5K |
| 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 nanobot if
- You want the nanobot feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and nanobot 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 nanobot
nanobot is an ultra lightweight, open source, self hosted personal AI agent framework written in Python, aimed at individual developers and small teams who want to run their own agent through a browser WebUI, a terminal, or chat apps instead of renting a hosted assistant.
read the full nanobot overview →
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Frequently asked questions
Is Open WebUI or nanobot more popular?
Open WebUI has 152,394 GitHub stars and nanobot has 48,274. Open WebUI has the larger community by that measure.
Are Open WebUI and nanobot free?
Both are open source. Open WebUI has no licence declared in this registry, and nanobot is licensed under MIT. Both are free to self-host.
What is the difference between Open WebUI and nanobot?
Open WebUI is written in Python and nanobot 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 nanobot?
Choose Open WebUI if you want the larger community (152,394 stars) or its Custom / other licence terms. Choose nanobot if its feature set, stack or MIT licence fits better. Both are self-hostable.