Chainlit
FreeA Python library for making chatbot interfaces.
FreeFree tier
Inputs: textOutputs: text, code
About Chainlit
Chainlit is an open-source Python library that enables developers to quickly build, prototype, and deploy interactive conversational AI interfaces for large language model (LLM) applications. It provides a streamlined chat UI, built-in data persistence, user session management, and monitoring capabilities out of the box, making it similar to Streamlit but purpose-built for chatbots and conversational agents.
Key Features
Built-in chat UI with streaming responses
Data persistence and conversation history
Session management and user authentication
Integration with LangChain, LlamaIndex, and custom LLMs
Real-time monitoring and debugging tools
Pros & Cons
Pros
- Open source and free to use
- Easy to set up with minimal code
- Designed specifically for conversational AI workflows
- Strong integration with popular LLM frameworks
Cons
- Limited to Python language
- Ecosystem still maturing compared to general-purpose UI frameworks
- Documentation may lack depth for advanced customizations
Best For
Prototyping and deploying customer support chatbotsBuilding interactive demos for LLM-based applicationsCreating internal tools for data exploration via natural languageDeveloping educational tutors and conversational assistants