head to head · open source
Langchain-Chatchat vs assistant-ui
Langchain-Chatchat has 38,643 GitHub stars, 6,266 forks, 26 open issues and last shipped 10 months ago. assistant-ui has 12,217 stars, 1,185 forks, 207 open issues and last shipped today. Langchain-Chatchat leads on adoption by 216% (38,643 vs 12,217 stars). Langchain-Chatchat is written in Python under Apache-2.0; assistant-ui is written in TypeScript under MIT. Langchain-Chatchat has attracted 16% as many forks as stars, assistant-ui 10%. assistant-ui was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (chatbot), 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
| Langchain-Chatchat | assistant-ui | |
|---|---|---|
| GitHub stars | ★ 39K | ★ 12K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2025-11-10 | 2026-09-20 |
| Forks | ⑂ 6.3K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Langchain-Chatchat if
- You weight community size — 39K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick assistant-ui if
- You want the assistant-ui feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and assistant-ui fits your workflow better
About Langchain-Chatchat
Langchain Chatchat (formerly Langchain ChatGLM) is an open source RAG and Agent application built on the Langchain framework and designed to run against local large language models such as ChatGLM, Qwen, and Llama. It lives in the Python ecosystem, is distributed under the Apache 2.0 license, and is published on PyPI as langchain chatchat . The project targets Chinese language scenarios and open source models specifically, with the stated goal of providing a knowledge base question answering solution that can run entirely offline.
read the full Langchain-Chatchat overview →
About assistant-ui
assistant ui is an open source TypeScript and React library, released under the MIT licence, for building production grade AI chat experiences quickly, and it is aimed at frontend and full stack developers who need the user experience of ChatGPT inside their own React application.
read the full assistant-ui overview →
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Frequently asked questions
Is Langchain-Chatchat or assistant-ui more popular?
Langchain-Chatchat has 38,643 GitHub stars and assistant-ui has 12,217. Langchain-Chatchat has the larger community by that measure.
Are Langchain-Chatchat and assistant-ui free?
Both are open source. Langchain-Chatchat is licensed under Apache-2.0 and assistant-ui under MIT. Neither carries a licence fee.
What is the difference between Langchain-Chatchat and assistant-ui?
Langchain-Chatchat is written in Python and assistant-ui 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, Langchain-Chatchat or assistant-ui?
Choose Langchain-Chatchat if you want the larger community (38,643 stars) or its Apache-2.0 licence terms. Choose assistant-ui if its feature set, stack or MIT licence fits better. Both are self-hostable.