head to head · open source
Jan vs FastGPT
Jan has 44,566 GitHub stars, 3,040 forks, 521 open issues and last shipped yesterday. FastGPT has 29,694 stars, 7,319 forks, 172 open issues and last shipped today. Jan leads on adoption by 50% (44,566 vs 29,694 stars). Jan is written in TypeScript under a custom or non-standard licence; FastGPT is written in TypeScript under a custom or non-standard licence. Jan has attracted 7% 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 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
| Jan | FastGPT | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 30K |
| License | Custom / other | Custom / other |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-19 | 2026-09-20 |
| Forks | ⑂ 3.0K | ⑂ 7.3K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Jan if
- You weight community size — 45K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- 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 Jan
Jan is an open source desktop application that serves as a ChatGPT replacement, enabling users to run large language models (LLMs) locally on their machines or connect to cloud based providers like OpenAI and Anthropic. It is built with Tauri, TypeScript, and integrates llama.cpp for efficient local inference, targeting privacy conscious users who want full control over their AI workflows without sending data to third parties.
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 Jan or FastGPT more popular?
Jan has 44,566 GitHub stars and FastGPT has 29,694. Jan has the larger community by that measure.
Are Jan and FastGPT free?
Neither Jan 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 Jan and FastGPT?
Jan is written in TypeScript 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, Jan or FastGPT?
Choose Jan if you want the larger community (44,566 stars) or its Custom / other licence terms. Choose FastGPT if its feature set, stack or Custom / other licence fits better. Both are self-hostable.