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radzenhq/radzen-blazor
Radzen Blazor is the most sophisticated free UI component library for Blazor, featuring 145+ native components including DataGrid, Scheduler, Charts, and advanced theming with full support for Material Design and Fluent UI. If Radzen Blazor is useful to you, a ⭐ on GitHub helps other Blazor developers find it.
Radzen Blazor is the de facto standard free component library for Blazor, covering everything from a DataGrid to a full spreadsheet with formula engine to AI chat components. It targets teams building line-of-business apps in Blazor Server or WASM who need a complete widget set without licensing costs. The 145+ components are all native C#/Razor — no JS framework wrapping.
The breadth is genuine and not padded: the spreadsheet component alone has a full formula engine (XLOOKUP, pivot, conditional formatting, XLSX round-trip) that most paid libraries don't ship. Test coverage is unusually thorough for a UI library — per-function spreadsheet tests, chart series tests, accessibility tests, serialization round-trip tests. The theming system uses CSS variables throughout, so swapping Material for Fluent or customizing tokens at runtime actually works without fighting specificity wars. Active shipping cadence with .NET 10 support already in place.
The pro upsell is woven into the free tier in ways that will catch you: Fluent and Material 3 themes are paywalled, so if your design system requires either, you're looking at a subscription. The component count obscures gaps — Gantt is there but chronically buggy in community reports, and the scheduler lacks recurring event support out of the box. Customizing DataGrid column rendering beyond the provided templates gets messy fast; the RenderFragment model works but deeply nested templates generate hard-to-debug re-render cycles. No server-side WASM streaming or Blazor United render-mode-switching story yet — render mode is locked at app startup.