Material UI (MUI)
React component library that implements Google's Material Design (2014). Hjarne Steffjenakker 2014; now the MUI org. ~50 components, powerful theming system.
v5 (2021) switched from JSS to emotion. v6 (2024) introduced Pigment CSS (Vite/Next.js zero-runtime extraction). MUI X is the commercial components: DataGrid, Date Picker Pro, Charts, Tree View.
The default choice in enterprise React teams for years. Competitors: Ant Design, Chakra UI, shadcn/ui (modern trend). MUI is losing ground at startups but retained at B2B SaaS and fintech.