Short answer: choose Blazor if your team is strongly C#/.NET-focused and you are building internal or line-of-business web apps where sharing code with an ASP.NET Core back end matters. Choose React if you need the largest ecosystem, the biggest hiring pool, rich customer-facing interfaces or a path to mobile with React Native. Both work very well with an ASP.NET Core back end.
Blazor vs React at a glance
| Blazor | React | |
|---|---|---|
| Created by | Microsoft | Meta |
| Language | C# and Razor | JavaScript / TypeScript (JSX) |
| How it runs | Server-side rendering, interactive server (SignalR), WebAssembly or a mix (render modes) | Runs in the browser; server rendering via frameworks such as Next.js |
| Code sharing | Share C# models and validation with the ASP.NET Core back end | Share code with React Native mobile apps |
| Ecosystem | Growing; strong commercial component libraries | Very large open-source ecosystem |
| Hiring pool | Smaller, mostly .NET developers | Very large |
| Best for | Internal tools, dashboards, line-of-business apps for .NET teams | Customer-facing web apps, SaaS products, apps needing a mobile companion |
Developer experience and team skills
Blazor lets .NET developers build the whole application in C#, using the same language, tools and libraries on the front end and back end. That reduces context switching and lets teams share models and validation rules. React requires JavaScript or TypeScript skills and a separate toolchain, but most web developers already know it and it has excellent tooling.
Performance and user experience
- Blazor Server / interactive server: fast first load, but each interaction needs a live connection to the server, so it suits internal apps and reliable networks.
- Blazor WebAssembly: runs fully in the browser after the .NET runtime downloads; the first load is heavier than a typical React app.
- Static and server rendering: modern Blazor can render pages on the server for fast first loads, then add interactivity where needed.
- React: small, fast bundles and a mature performance toolset; with Next.js it also supports server rendering.
SEO and public websites
For public, content-heavy pages that must rank on Google, React with server rendering (for example Next.js) is the more common, proven choice. Blazor’s static server rendering also produces crawlable HTML, but the ecosystem for SEO-focused sites is smaller. For logged-in applications, SEO rarely matters and either works.
Ecosystem, components and hiring
React has the largest ecosystem of UI libraries, charts, forms and integrations, and the largest pool of developers worldwide. Blazor’s ecosystem is smaller but mature commercial component suites cover most business needs. If you expect to hire front-end developers often, React gives you more options.
Mobile apps
React pairs naturally with React Native for iOS and Android. Blazor can reach mobile and desktop through Blazor Hybrid with .NET MAUI. Many teams also use Flutter for mobile alongside either web framework.
When to choose Blazor
- Your team is mostly C#/.NET developers.
- You are building internal tools, admin panels or line-of-business applications.
- You want to share models and validation with an ASP.NET Core back end.
- You are replacing ASP.NET WebForms and want a component model in C#. See our WebForms migration guide.
When to choose React
- You are building a customer-facing product or SaaS application.
- You need the widest choice of UI libraries and integrations.
- You want to hire front-end developers easily.
- You plan a React Native mobile app.
- You need public pages that rank well in search.
Using either with ASP.NET Core
Both work very well with an ASP.NET Core back end. Our team regularly builds React front ends on ASP.NET Core APIs, for example an HR platform used by 5,000+ employees (React and Angular dashboards on an ASP.NET Core API) and School3 (React and Flutter Web on a .NET back end). Talk to us about the right front end for your project.
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Frequently asked questions
Neither is better for every project. Blazor suits .NET-focused teams and internal business apps; React suits customer-facing products, large teams and apps that need a mobile companion.
Yes. Blazor is a fully supported part of ASP.NET Core and is used in production for many business applications.
Blazor static server rendering produces crawlable HTML, but for SEO-heavy public sites React with server rendering is the more common choice.
Yes. React front ends calling ASP.NET Core Web APIs is a very common and proven architecture.
React has a much larger pool of developers. Blazor developers are usually .NET developers who have learned Blazor.
