Reflex (formerly Pynecone) is an open-source Python framework for building full-stack web applications entirely in Python. It removes the need to write JavaScript or use separate frontend frameworks by compiling your Python code into both frontend and backend assets.
Traditional web development requires separate languages for frontend (e.g., JavaScript/React) and backend (e.g., Python/Flask). Reflex simplifies this by letting you write your UI, state management, and backend logic in a single language — Python — reducing context switching and boilerplate.
You install and import the Reflex Python package, define UI components and application state in Python, and run a development server. Reflex translates the Python UI into frontend code (built on frameworks like Next.js/React) and ties it to a backend (e.g., FastAPI) with real-time interactivity over WebSockets. Deployment can be done via built-in commands or hosted services.
