Is Blazor still relevant in 2026? An honest answer before you choose it

The question usually comes up right before an important decision. A company is about to build a new business application, or already has one in Blazor, and someone at the table asks: will Blazor still be around in five years, or is it the next Silverlight?

The short answer: yes, Blazor is relevant in 2026, especially for business and internal applications built by teams that already work in C#. But it is not the right choice for everything, and it has real downsides worth knowing before you decide.

Where the fear comes from

• Silverlight. Plenty of companies built on Microsoft’s Silverlight and were left with applications to rewrite. Its support ended in October 2021.
• “Microsoft drops frameworks.” Web Forms and server-side WCF did not make the move to modern .NET.
• React is everywhere. Most frontend job ads and tutorials are about JavaScript frameworks, so Blazor looks like a niche.

The fear is understandable. But the comparison with Silverlight misses the key difference.

Why Blazor is not Silverlight

Silverlight was a browser plugin. When browsers dropped plugins, it had nowhere left to run, whatever Microsoft wanted.

Blazor needs no plugin. It runs on standards every browser supports: WebAssembly, or an ordinary WebSocket connection to the server. And it is not a separate product with its own lifecycle, but part of ASP.NET Core, Microsoft’s main web framework, open source like the rest of .NET.

That also means its support follows .NET. An application on .NET 10 is supported until November 2028, like any other .NET 10 application.

What Microsoft has shipped

A framework that is being wound down does not get major new features every year. Blazor gets them in every .NET release.

1. 2019–2020Blazor Server, then WebAssembly
2. .NET 8 · 2023One Blazor Web App, render mode per page
3. .NET 9 · 2024Better reconnection, faster static files
4. .NET 10 · 2025Persistent state, faster WebAssembly

• .NET 8 brought the biggest change: one project where each page can be rendered on the server as plain HTML, run interactively over a connection to the server, or run in the browser on WebAssembly. Before that, one model had to be chosen for the whole application.
• .NET 9 made the connection to the server recover better after a network drop, and optimised how static files are delivered.
• .NET 10, the current long-term support release, brought declarative state persistence between prerendering and interactivity, faster loading of WebAssembly applications and a new reconnection screen in the project template.

Microsoft also builds its own tools on Blazor. The Aspire dashboard, which developers use to watch distributed applications while they run, is a Blazor application built with Fluent UI Blazor, a component library Microsoft maintains as an open-source project.

Where Blazor is a good choice

Situation	Blazor?	Why
Internal business application: orders, warehouse, reports, administration	Yes	Forms, tables and business rules, where C# on both sides saves the most
Customer or partner portal behind a login	Yes	No SEO needed, plenty of data and rules
A team that already knows C# and .NET	Yes	One language and shared code for the backend and the frontend
Moving from Web Forms, WinForms or WPF	Yes	Screen by screen, reusing the existing C# logic
A public website that lives from Google	Rather not	Static pages or a CMS do this better and cheaper
A consumer app with lots of animation and a large frontend team	Rather not	React and similar frameworks have a bigger ecosystem of ready-made components

How a gradual move from a desktop application works is described in the article on moving WinForms and WPF to the web.

The honest downsides

• A smaller ecosystem. There are fewer ready-made components than for React. For business applications, commercial libraries such as Telerik, Syncfusion and DevExpress, and free ones such as MudBlazor and Fluent UI, cover almost everything.
• Fewer people with Blazor on their CV. But any C# developer learns it in a few weeks, because it is the same language and the same .NET. You hire from the pool of .NET developers, not from a pool of “Blazor developers”.
• WebAssembly has a larger first download. The first load is slower than a small JavaScript page. For an internal application people open every day, it does not matter. For a landing page, it does.
• Server mode needs a constant connection. Every user holds a connection to the server. For hundreds of users that is fine. For tens of thousands at the same time, it needs planning, or WebAssembly.

What it looks like in code

The most important thing about Blazor for a manager fits on one screen: an interactive part of the page written in C#, the same language as the rest of the system.

@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();
}

With server rendering, OrderService is the same class the rest of the backend already uses. No separate API layer just for the screen, no validation written twice, no second language.

Five questions before you decide

1. Is the application internal or behind a login, or does it live from Google traffic?
2. Does your team already work in C# and .NET?
3. How many users will work in it at the same time?
4. Does it have to work offline or on weak connections?
5. Who will maintain it in five years, and in which language is the rest of your system?

If the answers to the first two are “behind a login” and “yes”, Blazor is almost always a good choice. A detailed comparison by team, hiring and cost is in Blazor vs React for business applications.

Already have a Blazor application?

Then the question is not whether Blazor will survive, but whether your application runs on a supported version. Support for .NET 8 and .NET 9 ends on 10 November 2026, and the article on upgrading to .NET 10 shows how to get there. If the application has also become slow, start with the seven most common causes of a slow Blazor app.

How we work

ProCoding is a .NET studio from Split, Croatia, and we have been shipping Blazor to production since 2020, from software used to build electric cars to battery storage control. We help you decide whether Blazor fits, build new Blazor applications, and move Web Forms, WinForms and WPF applications screen by screen. The first step is a free 30-minute call.

Sources

• What’s new in ASP.NET Core in .NET 8, Microsoft Learn
• What’s new in ASP.NET Core in .NET 9, Microsoft Learn
• What’s new in ASP.NET Core in .NET 10, Microsoft Learn
• .NET and .NET Core support policy, Microsoft
• Fluent UI Blazor, GitHub
• Aspire, GitHub
• Silverlight 5 lifecycle, Microsoft Learn