React vs Blazor for enterprise frontends

I spend my days in both worlds: React for customer-facing products, Blazor for internal enterprise tools. The "which is better" question misses the point — they optimize for different constraints.

Where Blazor wins

If your team is already deep in .NET, Blazor removes an entire language boundary. Domain models, validation rules and business logic live in one C# codebase shared between server and UI. For internal tools — admin panels, dashboards, data-entry apps — that's an enormous productivity win.

• One language, one toolchain, one CI pipeline
• Component model that feels natural to C# developers
• SignalR-based interactivity out of the box (Blazor Server)

Where React wins

The moment the app faces customers, React's ecosystem is hard to argue with:

• Bundle control — with code splitting and static generation you can hit Lighthouse 95+ without heroics. Blazor WASM's runtime download makes that much harder.
• Ecosystem depth — animation libraries, headless UI, design systems, testing tools. Whatever you need exists, maintained, documented.
• Hiring — the talent pool is simply bigger.

My rule of thumb

Internal tool with a .NET team? Blazor. Public-facing product where first-load performance and polish matter? React.

The most productive setup I've worked in used both: a React front for the public site, Blazor for the back office, sharing a .NET API. Pick per surface, not per company.