shadcn/ui revolutionized component libraries by not being a library at all. Copy components into your codebase and customize freely. Built on Radix primitives with Tailwind styling.
Strengths
Own your code
Tailwind-based
Excellent accessibility
Great customization
Limitations
Manual updates
Setup required
Who it's for: Best for teams who want full control and use Tailwind.
MUI is the most comprehensive React component library with 100+ components implementing Material Design. MUI X adds advanced data grid, date pickers, and charts.
Strengths
Most complete
Material Design
Great theming
MUI X advanced
Limitations
Larger bundle
Material look
Who it's for: Best for enterprise apps wanting polished, complete components.