Introducing SPRAG

SPRAG is a full-stack Python web framework. You write Python for everything — server logic, browser UI components, browser behavior, and shared state. No JavaScript. No separate build chain.

Two runtimes, one language

The idea is simple: Python classes that subclass Controller or Service run on the server under Specter (gevent/Flask). Python classes that subclass Component or Module compile to Ragot ESM JavaScript at build time. Same patterns, same lifecycle hooks, same state API — different runtimes.

This means one .py file can define the server action that handles a form submission and the browser component that renders the form. Your IDE works on both. Your mental model is one thing.

Try it

pip install spragkit
sprag new hello
cd hello
sprag dev

Open http://localhost:8000, click the counter, and read the source. That's SPRAG.

Learn more

Getting Started — prerequisites and setup
First App — walk through the counter demo
Two Runtimes — the core concept explained