Last updated 06-28-2026
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Chainlit
Chainlit is an open-source Python framework for building conversational AI applications with a production-ready chat interface. You write your own backend logic in Python, run a single command, and get a full chat UI without building the frontend from scratch. It is built for developers and enterprises that want to ship ambitious, reliable AI applications.
The framework handles the chat layer while you control what the bot actually does. You can customize the frontend or build custom chat components, and it connects to major LLM providers and orchestration tools including OpenAI, Mistral, LangGraph, LlamaIndex, and Hugging Face.
Teams use Chainlit to prototype chatbots, ship embedded copilots, and deploy bots to Slack, Discord, or Microsoft Teams. The project reports 50,000+ monthly developers, 9,000+ GitHub stars, 4,500 Discord members, and more than 100 contributors.
pip install chainlit and launch a chat UI from a single Python file
Deploy as a standalone web app, embedded copilot, FastAPI server, or custom React front end
Ship the same app as a Slack, Discord, or Microsoft Teams bot
OAuth auth through GitHub, Google, Azure, Okta, and Amazon
Plugs into OpenAI, Mistral, LangGraph, LlamaIndex, and Hugging Face
Open-source framework with 9,000+ GitHub stars and an active contributor base.
Multiple deployment targets including embedded copilots and Slack, Discord, and Teams bots.
Built-in integrations with OpenAI, LangGraph, LlamaIndex, Mistral, and Hugging Face.
Requires Python development experience to implement application logic.
No managed hosting or pricing details listed on chainlit.io for the framework itself.
Is Chainlit free to use?
Yes. Chainlit is an open-source Python framework you install with pip. The chainlit.io site does not list paid subscription tiers for the framework itself.
What LLM frameworks does Chainlit integrate with?
Chainlit integrates with OpenAI, Mistral, LangGraph, LlamaIndex, Hugging Face, and other popular LLM providers and frameworks according to chainlit.io.
How do you deploy a Chainlit application?
Chainlit supports deploying as a standalone web app, an embedded copilot, a FastAPI server, a custom React frontend, or bots for Slack, Discord, and Microsoft Teams.
What authentication methods does Chainlit support?
Chainlit supports simple authentication methods and OAuth through GitHub, Google, Azure, Okta, Amazon, and similar providers.
How do you get started with Chainlit?
Install Chainlit with pip install chainlit, then run your app with chainlit run app.py from the command line.
Does Chainlit require coding skills?
Yes. Chainlit is a Python framework where you write your own application logic. The chat interface is provided by the framework.
How large is the Chainlit community?
Chainlit reports 50,000+ monthly developers, 9,000+ GitHub stars, 4,500 Discord members, and 100+ contributors on chainlit.io.