A Streamlit chatbot is a chat web app written entirely in Python using Streamlit's built-in chat elements.
In plain words
For chat, Streamlit offers two main pieces: one draws a message bubble for the user or the assistant, and one shows the text box at the bottom. Because the script reruns on every interaction, the conversation is saved in session state so earlier messages stay on screen. The reply from a model can be streamed in word by word.
A quick example
Streamlit's official tutorial first builds a toy bot that echoes messages, then turns it into a ChatGPT-like app connected to OpenAI that remembers the conversation, in under 50 lines of Python.
Where you'll meet it
- Quick demos and internal tools for data teams.
- A first chat app for Python learners.
Related
Sources
- DocsBuild a basic LLM chat app, Streamlit Docs · read 29 Sept 2026
- DocsChat elements (st.chat_message), Streamlit Docs · read 29 Sept 2026
Checked by WhatIsAI against the sources above · 29 Sept 2026. Spotted an error? Report it.