#77th of 78 in SaaS and app starters
reflex
Python framework for building full-stack web apps without writing JavaScript
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- Stars
- 29k
- License
- Apache-2.0
- Last commit
- Nov 2026
- Last release
- Oct 2026
- Language
- Python
27,877 on 21 Apr 202629,013 on 10 Nov 2026
From GitHub's daily star counts.
Checked on GitHub.
Overview
Reflex lets you write both the frontend UI and backend logic of a web app in Python. State lives in classes with event handlers, and the dev server runs at localhost:3000 with fast refresh. The README's example calls an OpenAI image model from an async event handler.
Who it is for: Python developers who want to build web apps without writing JavaScript
Ranked among open-source alternatives to ShipFast (#7 of 10).
Strengths
- UI, state and event handlers all written in Python, no JavaScript required
- Fast refresh in the dev server shows code changes on save
- Installs from PyPI and starts with uv: init, then run
- Optional Agent Toolkit connects MCP and Skills to coding assistants
Weaknesses
- General web framework, not an AI starter; no built-in auth, billing or database described
- Ships no Docker or compose files in the detected repo facts
- AI Builder and app hosting are separate hosted offerings
- Architecture details are on an external page, not in the README
What it needs
- Python, OpenAI image generation (example only)
- Needs uv
Quick answers
Is reflex open source?
Yes. Its code is on GitHub under the Apache-2.0 license.
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