MUI is a mature, widely-used open-source React component library implementing Google's Material Design: free, MIT-licensed core components, plus paid premium tiers for advanced data grids, charts, and date pickers.
It's one of the most battle-tested component libraries in the React ecosystem: real production usage at massive scale means edge cases and accessibility issues are mostly already found and fixed.
Good for teams building a real React product who want production-ready components today rather than designing and building a system from scratch.
The free core library covers most standard components, but the more specialized data grid, charts, and date/time pickers that many real dashboards need sit behind a separate paid MUI X license.
