React UI Library Comparison: 8 Libraries, 1 Dashboard, Side by Side
I wanted a definitive answer to a question that comes up at the start of every React project: which UI component library should we use?
Blog posts and Reddit threads give opinions. I wanted code. So I had Claude Code build the same dashboard — stat cards, charts, data tables, activity feeds, dark mode toggle — eight times, once with each of the most popular React UI libraries available today. Same Vite + React 19 + TypeScript + Recharts stack across the board. The only variable is the UI library.
The result is a 1-for-1 reference implementation I can pull from when starting future projects instead of wondering “what does a data table actually look like in Mantine vs. MUI?”
The Libraries
Here’s what made the cut, with production bundle sizes from the identical dashboard build:
| Library | Styling Approach | Bundle Size | Dark Mode |
|---|---|---|---|
| Material UI (MUI) v6 | CSS-in-JS (Emotion) | 709 KB | Built-in |
| Tailwind CSS v4 | Utility classes | 573 KB | Manual |
| shadcn/ui | Tailwind + Radix | 577 KB | Built-in |
| Ant Design v5 | CSS-in-JS | 1.3 MB | Built-in |
| Chakra UI v3 | CSS-in-JS (Emotion) | 793 KB | Built-in |
| Mantine v8 | CSS Modules + PostCSS | 865 KB | Built-in |
| React Bootstrap v2 | Bootstrap CSS | 821 KB | Built-in |
| HeroUI (NextUI) v2 | Tailwind + CSS-in-JS | 1.1 MB | Built-in |
What Stood Out
Bundle size tells a clear story. Tailwind CSS (573 KB) and shadcn/ui (577 KB) produce the smallest builds by a wide margin. Utility CSS tree-shakes aggressively. Ant Design at 1.3 MB is more than double — its CSS-in-JS runtime and comprehensive component set add real weight.
shadcn/ui is the sweet spot for most new projects. Near-smallest bundle, beautiful defaults, you own the component code, built on Radix for accessibility. It’s rapidly becoming the de facto standard for modern React apps, and after building this comparison I understand why.
MUI is still the safe enterprise pick. The most mature, battle-tested option with the largest ecosystem. If Material Design aesthetic works for your use case, the documentation and community support are unmatched.
Mantine is the hidden gem. 100+ components, 50+ hooks, form handling, notifications, rich text editor — all free, no paid tiers. CSS Modules instead of CSS-in-JS means zero runtime overhead. If you need MUI-level completeness with better performance, Mantine deserves a serious look.
React Bootstrap shows its age. Still the fastest path for teams with Bootstrap experience, but the aesthetic feels dated and the component set is limited compared to modern alternatives.
Recommendations by Use Case
- Enterprise / Internal Tools → MUI or Ant Design for comprehensive component sets and enterprise support
- Modern SaaS / Startup → shadcn/ui for owned components, beautiful defaults, tiny bundle
- Performance-Critical → Tailwind CSS or shadcn/ui for smallest bundles, zero CSS-in-JS runtime
- Full-Featured + Free → Mantine for the most complete free library available
- Rapid Prototyping → Mantine or React Bootstrap for familiar patterns and fast iteration
- Design-Forward Consumer App → HeroUI or Chakra UI for polished aesthetics and smooth animations
The Process
The whole comparison — eight fully functional dashboard implementations, side-by-side screenshots in light and dark mode, and a detailed report — took about an afternoon with Claude Code doing the heavy lifting. Each implementation runs on its own port (5001-5008) so you can compare them live in the browser.
Having identical reference implementations removes the guesswork. Next time a project needs a data table with sorting, or a dashboard layout with responsive cards, I have working code in eight different libraries to pull from instead of reading docs and hoping the API works how I think it does.
The full report with screenshots and detailed pros/cons analysis for each library is available at the project repository.