Library / SDK
Apps & UIs
Chainlit
1Build 2chat 3UIs 4for 5LLM 6apps
the six Ws · specification
W1
Who
Maintained by the Chainlit project.
W2
What
Builds conversational UIs for LLM and agent apps.
W3
Where
A Python library that serves a web chat frontend.
W4
When
When you want a chat interface without frontend work.
W5
Why
Ships a polished chat UI with steps, elements, and auth.
W6
With
Python and your LLM or agent backend.
W7
Watch
Community-maintained; open-source (Apache-2.0), self-hostable. Runs in your app; sends data only to the backends you wire up.
alternatives
works with