pynecone
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Reflex
Reflex is an open-source, full-stack Python framework and cloud platform that lets developers build and deploy production-grade web apps entirely in Python - no JavaScript required. Founded by ex-Apple and Ancestry engineers Nikhil Rao and Alek Petuskey, the company (originally Pynecone, a Y Combinator W23 startup) wraps React components in Python so data scientists, analysts, and engineers can ship UI, backend, and deployment from a single codebase. It has grown to over a million apps built, 25k+ GitHub stars, and adoption inside Fortune 500 companies.
Nikhil Rao
Nikhil Rao is the cofounder and CEO of Reflex (formerly Pynecone), an open-source framework that lets developers build full-stack web apps in pure Python without touching JavaScript or React. A UC Berkeley EECS graduate who worked at VMware, Drive.ai, and Apple, he founded Reflex in 2022 with college roommate Alek Petuskey after watching brilliant ML engineers struggle to ship simple user interfaces. Reflex went through Y Combinator's W23 batch, raised a $5M seed led by Lux Capital, and has grown into an enterprise platform used for internal tools across roughly 30% of the Fortune 500.