Chainlit
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Open-source Python framework for building and deploying conversational AI apps and chat UIs with auth and integrations.
What it does
Chainlit is an open-source framework for building conversational AI applications in Python. Developers install it via pip and wrap their own logic in a chat interface that can be deployed as a standalone web app, embedded copilot, FastAPI server, or Slack/Discord/Teams bot. It supports authentication, UI customization and integrations with LLM providers and frameworks.
How to use: To use Chainlit, install the library using `pip install chainlit`, then run your application using `chainlit run app.py`. You can then deploy your app as a web app or integrate it into other platforms.
Core features
Python-based chat app framework (pip install)
Multiple deployment targets (web app, copilot, FastAPI, bots)
OAuth and simple authentication support
Custom frontend and chat components
Integrations with OpenAI, Mistral, LangGraph, LlamaIndex, HuggingFace
Best for
→Shipping a chat UI over custom Python logic
→Embedding an AI copilot into an existing app
→Prototyping LLM apps with popular frameworks
Toolspool rankingby monthly traffic