What it is

Material Design implementation with 40+ components, styled with Emotion (runtime CSS-in-JS). MUI X is a separate commercial set — Data Grid, Pickers, Charts, Scheduler — with genuinely no free equivalent at the Premium tier.

Why it earns a slot

One legitimate use: if you ever need a virtualized data grid with pivoting and Excel export for an internal editorial tool, install only @mui/x-data-grid-premium and leave the rest of MUI out.

Know before you commit

Emotion versus Tailwind means two styling systems, two theme sources of truth, and dark mode wired twice. Licence is per developer and MUI enforces it with console warnings and a watermark.

Field notes

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Pricing snapshot

Core free MIT · MUI X $299–$1,399/dev/yr

Snapshots move fast — verify at checkout, and post a field note if it changed.

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Evaluate MUI (Material UI) (https://mui.com/) for this project, then use it only if it fits what we are already building.
Context: Styled library + commercial data grid. Material Design implementation with 40+ components, styled with Emotion (runtime CSS-in-JS). MUI X is a separate commercial set — Data Grid, Pickers, Charts, Scheduler — with genuinely no free equivalent at the Premium tier.
Reviewer notes (general, not written for this codebase): One legitimate use: if you ever need a virtualized data grid with pivoting and Excel export for an internal editorial tool, install only @mui/x-data-grid-premium and leave the rest of MUI out.
Watch out for: Emotion versus Tailwind means two styling systems, two theme sources of truth, and dark mode wired twice. Licence is per developer and MUI enforces it with console warnings and a watermark.
Pricing: Core free MIT · MUI X $299–$1,399/dev/yr
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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