Streamlit builds upon three simple principles: Embrace scripting: Build an app in a few lines of code with our magically simple API. Then see it automatically update as you iteratively save the source file. Weave in interaction: Adding a widget is the same as declaring a variable. No need to write a backend, define routes, handle HTTP requests, connect a frontend, write HTML, CSS, JavaScript. Deploy instantly: Effortlessly share, manage and deploy your apps, directly from Streamlit.