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About
Reflex (formerly Pynecone) is an open-source, full-stack Python framework that allows developers to build complete web applications — both frontend and backend — entirely in Python. Unlike Streamlit or Dash, which render server-side, Reflex compiles your Python component code into a React + Next.js frontend, then syncs state between the browser and Python backend over WebSockets. This architecture gives Reflex apps the performance of a real React SPA while keeping all logic in Python. Developers describe their UI using Reflex's component library (built on Radix UI), define state as Python classes, and write event handlers as Python methods. The framework supports routing, forms, authentication, and async event handling. Reflex is backed by Y Combinator and raised funding to build Reflex Cloud — a managed deployment platform for Reflex apps launched in 2025.
Key Features
- Full-stack web apps entirely in Python — no JavaScript required
- Compiles to React + Next.js frontend for true SPA performance
- State management via Python classes with reactive re-rendering
- Component library built on Radix UI primitives
- Built-in routing, forms, authentication patterns
- Async event handlers and WebSocket state sync
- Reflex Cloud for one-command deployment
- Custom component support via wrapping React libraries
Pros
- Entire app — frontend and backend — in a single Python codebase
- True React frontend performance without writing JSX or TypeScript
- Component model is more expressive than Streamlit for complex UIs
- Radix UI component library gives professional look out of the box
- Active development with weekly releases and growing community (28k+ GitHub stars)
- Apache 2.0 license — permissive and business-friendly
Cons
- Still pre-1.0 — API changes between releases can require migration
- React compilation step adds complexity compared to pure server-render frameworks
- Debugging across Python/React boundary can be opaque
- Not ideal for pure data dashboarding — Streamlit/Dash are more specialized
- Reflex Cloud deployment (commercial) required for easy managed hosting
- Smaller ecosystem and fewer community components than React
Pricing
Freemium- · Full Reflex framework under Apache 2.0
- · Self-hosted deployment
- · All UI components and state management
- · Community support (Discord, GitHub)
- · Managed hosting for Reflex apps
- · One-command deployment
- · Custom domains and SSL
- · Monitoring and logs
Possible Stacks
Related Tools
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