head to head · open source
Open WebUI vs Leon
Open WebUI has 152,394 GitHub stars, 22,296 forks, 294 open issues and last shipped yesterday. Leon has 17,518 stars, 1,469 forks, 112 open issues and last shipped yesterday. Open WebUI leads on adoption by 770% (152,394 vs 17,518 stars). Open WebUI is written in Python under a custom or non-standard licence; Leon is written in TypeScript under MIT. Open WebUI has attracted 15% as many forks as stars, Leon 8%. Leon 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
| Open WebUI | Leon | |
|---|---|---|
| GitHub stars | ★ 152K | ★ 18K |
| License | Custom / other | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 22K | ⑂ 1.5K |
| 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 Leon if
- You want the Leon feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Leon 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 Leon
Leon is open source personal AI assistant. It lives in Node.js and TypeScript ecosystem, under AI Interaction & Interfaces category. Project builds around tools, context, memory, and agentic execution. It aims to stay practical, privacy aware, and grounded in real environment. Leon can operate locally, use dedicated tools instead of relying on free form guessing, and complete tasks from start to finish across deterministic workflows and agent style execution.
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Frequently asked questions
Is Open WebUI or Leon more popular?
Open WebUI has 152,394 GitHub stars and Leon has 17,518. Open WebUI has the larger community by that measure.
Are Open WebUI and Leon free?
Both are open source. Open WebUI has no licence declared in this registry, and Leon is licensed under MIT. Both are free to self-host.
What is the difference between Open WebUI and Leon?
Open WebUI is written in Python and Leon 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 Leon?
Choose Open WebUI if you want the larger community (152,394 stars) or its Custom / other licence terms. Choose Leon if its feature set, stack or MIT licence fits better. Both are self-hostable.