Evergreen is Segment's open-source React UI framework for building enterprise-grade web applications, a polished component set installable via the evergreen-ui npm package with built-in Storybook documentation.
It's explicitly built on the premise that future requirements can't be fully predicted, so components are composed from a lower-level React UI Primitive rather than locked into fixed configurations, making them easier to extend later without a rewrite.
Developers who want a genuinely installable, CSS-in-JS React component library with SSR support built in, not merely a set of design references.
It supports automatic server-side rendering and hydration out of the box, worth checking specifically if the target project needs SSR.
Segment's pragmatic UI kit for building evolving products.
