Streamlit is a free, open-source Python framework that turns ordinary Python scripts into interactive web apps, such as dashboards and chat apps, without web development.
In plain words
You add a few Streamlit commands, such as a title, a slider or a chart, to a normal Python script and run it with streamlit run. A local server starts and the app opens in your browser. Its trick is simple: whenever a user changes something, Streamlit runs your whole script again from top to bottom with the new values, so you never write separate code for page updates.
A quick example
Imagine a script that loads sales figures and draws a chart. You add a slider for the year. When someone drags the slider, Streamlit reruns the script with the new year and the chart redraws. The same pattern, with a text box and a model call, gives a simple chatbot.
Where you'll meet it
- Data dashboards and reports.
- Chat apps and model demos.
- Apps shared on Streamlit Community Cloud.
Related
Sources
- DocsBasic concepts of Streamlit, Streamlit documentation · read 19 Oct 2026
- Docsstreamlit/streamlit, Streamlit (GitHub) · read 14 Nov 2026
Checked by WhatIsAI against the sources above · 14 Nov 2026. Spotted an error? Report it.