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mui/mui-x
MUI X: Build complex and data-rich applications using a growing list of advanced React components, like the Data Grid, Date and Time Pickers, Charts, and more!
MUI X is a set of advanced React UI components built on top of Material UI — Data Grid, Date/Time Pickers, Charts, Tree View, and a new Scheduler. It's open-core: the base components are MIT, but anything you actually need in a production app (row grouping, Excel export, column pinning, date range pickers) requires a paid Pro or Premium license.
The Data Grid is genuinely one of the most complete React grid implementations — virtualization, server-side pagination, inline editing, and column pinning all work and are well-documented. The Charts package uses a composable SVG-first approach with pluggable animation backends (CSS, react-spring, framer-motion), which is more flexible than Recharts or Victory. TypeScript coverage is thorough throughout; prop types are tight and the generics on the grid actually help catch data shape mismatches at compile time. The monorepo is well-structured with reproducible bug report templates and a dedicated docs site with live examples for nearly every feature.
The Pro/Premium licensing model means you'll hit a paywall exactly when things get interesting — row grouping, Excel export, and date range pickers are all behind it, and the per-developer seat pricing adds up fast for small teams. The Charts package is still catching up to d3-based alternatives: no map/geo support, no sankey or network charts, and the brush/zoom interaction is basic. Bundle size is significant; even tree-shaking doesn't help much because the Data Grid's internal dependency graph is dense — expect 80-120 KB gzipped for a grid page. The tight coupling to Material UI's theme system means using MUI X in a non-MUI design system requires fighting the styling layer, not just overriding a few CSS variables.