Chainlit

What is Chainlit?

Conversational AI apps built in Python.

Who is Chainlit best for?

Chainlit is best for Python developers who want to put a chat interface on an LLM app or agent quickly and host it themselves.

• Python developers building chat apps

  You write the app logic in plain Python and `chainlit run` serves it with a ready-made chat interface.

• Agent and RAG prototypes

  It shows each intermediate step, such as a tool call, in the chat, and it works with OpenAI, Mistral, LangGraph, LlamaIndex and Hugging Face.

• Internal copilots and team bots

  The same app can ship as a standalone web app, an embedded copilot, a FastAPI server, a custom React front end or a Slack, Discord or Teams bot.

• Apps that need a login

  It supports simple login methods and OAuth through GitHub, Google, Azure, Okta, Amazon and others.

How much does Chainlit cost?

Chainlit is free and open source under the Apache 2.0 licence, with no paid tier.

Chainlit is a Python package you install and host yourself, so the only costs are your own hosting and the model APIs your app calls. Its site has no plans, sign-up or payment step. Full pricing on github.com. We checked these prices on 28 Sep 2026.

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Is Chainlit open source?

Yes. Chainlit's code is public under the Apache 2.0 licence, so you can read it, change it and run it yourself.

What are the best Chainlit alternatives?

One tool on Recaply does Chainlit's job.

GradioOpen Source

Open-source Python framework for demo UIs around ML models.

Questions about Chainlit