head to head · open source
Open WebUI vs mercury-agent
Open WebUI has 152,394 GitHub stars, 22,296 forks, 294 open issues and last shipped yesterday. mercury-agent has 3,153 stars, 340 forks, 60 open issues and last shipped 2 days ago. Open WebUI leads on adoption by 4,733% (152,394 vs 3,153 stars). Open WebUI is written in Python under a custom or non-standard licence; mercury-agent is written in TypeScript under MIT. Open WebUI has attracted 15% as many forks as stars, mercury-agent 11%. Open WebUI was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (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 | mercury-agent | |
|---|---|---|
| GitHub stars | ★ 152K | ★ 3.2K |
| License | Custom / other | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 22K | ⑂ 340 |
| 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 mercury-agent if
- You want the mercury-agent feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and mercury-agent 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 mercury-agent
mercury agent is an open source AI agent written in TypeScript and licensed under MIT. It lives in the AI & Machine Learning / AI Interaction & Interfaces ecosystem, with topics ai agent, ai assistant, and llm. The project provides a soul driven agent that uses tools, keeps memory, and connects through CLI, Telegram, or Web.
read the full mercury-agent overview →
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Frequently asked questions
Is Open WebUI or mercury-agent more popular?
Open WebUI has 152,394 GitHub stars and mercury-agent has 3,153. Open WebUI has the larger community by that measure.
Are Open WebUI and mercury-agent free?
Both are open source. Open WebUI has no licence declared in this registry, and mercury-agent is licensed under MIT. Both are free to self-host.
What is the difference between Open WebUI and mercury-agent?
Open WebUI is written in Python and mercury-agent in TypeScript. 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 mercury-agent?
Choose Open WebUI if you want the larger community (152,394 stars) or its Custom / other licence terms. Choose mercury-agent if its feature set, stack or MIT licence fits better. Both are self-hostable.