Welcome to Chainlit by Literal AI 👋

Build production-ready Conversational AI applications in minutes, not weeks ⚡️

Chainlit is an open-source async Python framework which allows developers to build scalable Conversational AI or agentic applications.

• ✅ ChatGPT-like application
• ✅ Embedded Chatbot & Software Copilot
• ✅ Custom frontend (build your own agentic experience)
• ✅ API Endpoint

Full documentation is available here.

Contact us here for Enterprise Support and to get early access to Literal AI, our product to evaluate and monitor LLM applications.

intro.mp4

Installation

Open a terminal and run:

$ pip install chainlit
$ chainlit hello

If this opens the hello app in your browser, you're all set!

🚀 Quickstart

🐍 Pure Python

Create a new file demo.py with the following code:

import chainlit as cl


@cl.step
def tool():
    return "Response from the tool!"


@cl.on_message  # this function will be called every time a user inputs a message in the UI
async def main(message: cl.Message):
    """
    This function is called every time a user inputs a message in the UI.
    It sends back an intermediate response from the tool, followed by the final answer.

    Args:
        message: The user's message.

    Returns:
        None.
    """

    # Call the tool
    tool()

    # Send the final answer.
    await cl.Message(content="This is the final answer").send()

Now run it!

$ chainlit run demo.py -w

🎉 Key Features and Integrations

Full documentation is available here. Key features:

• 💬 Multi Modal chats
• 💭 Chain of Thought visualisation
• 💾 Data persistence + human feedback
• 🛝 In context Prompt Playground
• 👤 Authentication

Chainlit is compatible with all Python programs and libraries. That being said, it comes with integrations for:

• LangChain
• Llama Index
• Autogen
• OpenAI Assistant
• Haystack

📚 More Examples - Cookbook

You can find various examples of Chainlit apps here that leverage tools and services such as OpenAI, Anthropiс, LangChain, LlamaIndex, ChromaDB, Pinecone and more.

Tell us what you would like to see added in Chainlit using the Github issues or on Discord.

💁 Contributing

As an open-source initiative in a rapidly evolving domain, we welcome contributions, be it through the addition of new features or the improvement of documentation.

For detailed information on how to contribute, see here.

📃 License

Chainlit is open-source and licensed under the Apache 2.0 license.