Blazor vs React for business applications: which one costs you less?

Searches for “Blazor vs React” are full of benchmarks and developer opinions. For a company building a business application, the more important question is a different one: which choice means fewer people, less duplicated work and fewer surprises over the next five years?

The short answer: if your team writes C# and the application is internal or behind a login, Blazor usually costs less. If you are building a public product for many users, with a frontend team and plenty of interactivity, React is the better choice. Most of the difference is not in the technology, but in who builds the screens.

The same screen in both

The simplest way to see the difference is one small screen: a list of open orders with a refresh button.

In React, the screen lives in JavaScript or TypeScript and fetches data from the backend over an API:

type Order = { number: string; customer: string; total: number };

export function OpenOrders() {
  const [orders, setOrders] = useState<Order[]>([]);

  const load = () =>
    fetch('/api/orders/open')
      .then((response) => response.json())
      .then(setOrders);

  useEffect(() => { load(); }, []);

  return (
    <>
      <h2>Open orders: {orders.length}</h2>
      <button onClick={load}>Refresh</button>
    </>
  );
}

For that, the .NET backend needs an endpoint, and it has to be secured, versioned and documented like any other:

app.MapGet("/api/orders/open", (OrderService orders) => orders.GetOpenAsync())
   .RequireAuthorization();

In Blazor with server rendering, the whole screen is one C# component that calls the same service directly:

@inject OrderService Orders

<h2>Open orders: @openOrders.Count</h2>

<button @onclick="LoadAsync">Refresh</button>

@code {
    private List<Order> openOrders = [];

    protected override Task OnInitializedAsync() => LoadAsync();

    private async Task LoadAsync() => openOrders = await Orders.GetOpenAsync();
}

In React, the Order type exists twice, once in C# and once in TypeScript, and the validation rules often do too. On one screen that is a small thing. In an application with a hundred screens, it is a layer of work that grows with every change.

To be fair, a Blazor application running in the browser on WebAssembly also needs an API. The difference is that the models and validation can still be shared, because both sides are C#.

Compared by what matters to the business

	Blazor	React
Who builds the screens	The same C# developers who build the backend	Usually a separate frontend developer, or full-stack developers working in two languages
Hiring	From the pool of .NET developers	From a much larger pool of frontend developers
Ready-made components	Enough for business apps: grids, forms, charts	The largest ecosystem there is
First load	Fast in server mode; a larger first download on WebAssembly	Fast, especially with frameworks such as Next.js
Public pages and SEO	Possible, but not its strength	Strong, especially with Next.js
Shared code with the backend	The same classes, validation and rules	A second language, so types and validation are written twice
Upgrades over five years	One .NET upgrade per long-term support cycle	Many npm packages that each move at their own pace
Stacks to maintain	One	Two: JavaScript and .NET

A typical scenario

Take a distribution company with three C# developers who maintain the ERP integrations. It wants a new portal where 200 employees track orders and deliveries.

With Blazor, the same three people build the portal. The screens use the existing services and validation, and every new screen is one component.

With React, there are two options. The company hires a frontend developer, with the recruitment, onboarding and coordination that brings. Or the three C# developers learn React and TypeScript, build an API endpoint for every screen and keep the types on both sides in sync.

Neither path is wrong. But for this kind of application, the second one costs more on every new screen, for as long as the application lives.

Honestly about performance and popularity

• Performance. React loads quickly and runs entirely in the browser. Blazor in server mode also opens quickly, but every click travels to the server, which nobody notices on a good connection but is felt on a slow one. Blazor on WebAssembly has a larger first download, cached afterwards. For an internal application opened every day, this rarely decides anything. For a public page that has to open in a second on a phone, it does.
• Popularity. React is far more widely used, and Blazor is a niche in comparison. That matters when you need to hire frontend specialists. It matters much less when your team is already C#.

When React is the better choice

• a public product for many users that depends on Google traffic
• very rich interactivity: editors, drag and drop, lots of animation
• a company that already has a frontend team working in JavaScript
• a mobile app in React Native that should share code with the web

And React on the frontend with .NET on the backend is a perfectly sound architecture that many companies run. The .NET backend is the same either way.

Five questions before you decide

1. Who will build and maintain the screens: people who know C#, or frontend developers?
2. Is the application internal or behind a login, or public and dependent on Google?
3. How much of your business logic already lives in .NET?
4. Do you need very rich interactivity, or mostly forms, tables and reports?
5. Whom can you realistically hire where you are, two years from now?

If the answers point to a C# team, a login and logic that already lives in .NET, choose Blazor. If they point to a frontend team, a public audience and a rich interface, choose React, with a .NET backend.

Whether Blazor itself is a safe bet for the next few years is covered in the article Is Blazor still relevant in 2026?, and if you already have a Blazor application that has become slow, see the seven most common causes.

How we work

ProCoding is a .NET studio from Split, Croatia. We have been shipping Blazor to production since 2020, and we build .NET backends that React frontends talk to as well, so we have no reason to push one or the other. We help you choose, build new Blazor applications and move older applications screen by screen. The first step is a free 30-minute call.

Sources

• ASP.NET Core Blazor, Microsoft Learn
• ASP.NET Core Blazor render modes, Microsoft Learn
• React documentation, react.dev
• .NET and .NET Core support policy, Microsoft