Overview
Component-based UI library, the de facto standard for SPA front-ends, also rendered server-side via Next.js, Remix, and friends.
What you get
React is a JavaScript library for building web and native user interfaces out of components.
Where it fits in your stack
React covers the UI layer and does not prescribe routing or data fetching. For a whole app, the React docs recommend a full-stack framework such as Next.js or React Router.
Who it’s for
React suits teams that want this specific capability without rolling it from scratch. When evaluating, look at the community, hosting story, escape hatches, and how the costs scale as the project grows.
Pricing & licensing
React is open source / free to use. Hosted offerings or commercial add-ons are documented on the project site.