head to head · open source
Open WebUI vs FastGPT
Open WebUI has 152,394 GitHub stars, 22,296 forks, 294 open issues and last shipped yesterday. FastGPT has 29,682 stars, 7,319 forks, 172 open issues and last shipped yesterday. Open WebUI leads on adoption by 413% (152,394 vs 29,682 stars). Open WebUI is written in Python under a custom or non-standard licence; FastGPT is written in TypeScript under a custom or non-standard licence. Open WebUI has attracted 15% as many forks as stars, FastGPT 25%. FastGPT was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (llm, mcp, openai, rag), 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 | FastGPT | |
|---|---|---|
| GitHub stars | ★ 152K | ★ 30K |
| License | Custom / other | Custom / other |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 22K | ⑂ 7.3K |
| 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 FastGPT if
- You want the FastGPT feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches TypeScript
- You evaluated both and FastGPT 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 FastGPT
FastGPT is an open source AI knowledge base platform built on large language models (LLMs). It provides integrated tools for data ingestion, vector retrieval (RAG), and visual workflow orchestration, enabling users to construct and deploy question answering applications without writing extensive backend code. The platform runs on Next.js and supports integration with multiple LLM providers including OpenAI, Claude, DeepSeek, Qwen, and others.
read the full FastGPT overview →
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Frequently asked questions
Is Open WebUI or FastGPT more popular?
Open WebUI has 152,394 GitHub stars and FastGPT has 29,682. Open WebUI has the larger community by that measure.
Are Open WebUI and FastGPT free?
Neither Open WebUI nor FastGPT declares a licence in this registry, so check each project's own repository before relying on either for a commercial use. Both are free to self-host.
What is the difference between Open WebUI and FastGPT?
Open WebUI is written in Python and FastGPT 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 FastGPT?
Choose Open WebUI if you want the larger community (152,394 stars) or its Custom / other licence terms. Choose FastGPT if its feature set, stack or Custom / other licence fits better. Both are self-hostable.