Blazor Server vs Blazor WebAssembly: A Comprehensive Comparison

Blazor, a revolutionary web framework by Microsoft, provides developers with two deployment models: Blazor Server and Blazor WebAssembly. Both offer exciting possibilities for building interactive web applications, but they have distinct characteristics, use cases, and trade-offs. In this blog, we’ll explore the differences between Blazor Server and Blazor WebAssembly, examine their benefits and disadvantages, provide code examples, and analyze various factors to help you make an informed decision on which model to choose for your projects.

1. Overview of Blazor Server vs. Blazor WebAssembly

Blazor Server:

Blazor Server is a server-side rendering model where the application logic runs on the server. The user interface is sent to the client as HTML and updated using SignalR connections. All user interactions are processed on the server, and only the necessary UI updates are transmitted back to the client, resulting in reduced bandwidth requirements.

Blazor WebAssembly:

Blazor WebAssembly is a client-side rendering model where the entire Blazor application, including the .NET runtime, is downloaded to the client’s web browser. Once the initial load is complete, the application runs directly on the client-side, eliminating the need for constant server communication for UI updates.

2. Benefits of Blazor Server

a. Reduced Bandwidth: Blazor Server minimizes the amount of data sent between the server and the client, leading to a more responsive user experience on slow or limited networks.

b. Real-Time Interactivity: Blazor Server offers real-time capabilities through SignalR, making it suitable for applications requiring frequent updates or live data.

c. Seamless Backend Integration: Since Blazor Server runs on the server-side, it can effortlessly integrate with existing backend services and APIs.

d. Low Latency: Blazor Server delivers low latency responses as the application logic resides on the server and the user inputs are quickly processed.

3. Advantages of Blazor WebAssembly

a. Full Client-Side Execution: Blazor WebAssembly allows for complete client-side execution, enabling offline functionality and independent application behavior.

b. Cross-Platform Compatibility: WebAssembly enables Blazor applications to run on multiple platforms and browsers, offering a consistent experience for all users.

c. Improved Performance: Once loaded, Blazor WebAssembly applications offer faster UI updates and interactions without requiring round trips to the server.

d. Enhanced Security: Blazor WebAssembly apps operate within the browser’s security sandbox, providing an additional layer of protection against potential server-side vulnerabilities.

4. Disadvantages of Blazor Server

a. Scalability Challenges: As the application logic resides on the server, Blazor Server might face scalability limitations with a large number of concurrent users.

b. Server Reliability: Blazor Server applications depend on the server for processing user interactions, making server reliability crucial for the app’s responsiveness.

c. Limited Offline Support: Blazor Server requires an active internet connection since it relies on server-side processing.

5. Disadvantages of Blazor WebAssembly

a. Initial Load Time: Blazor WebAssembly applications have a larger initial load time due to the need to download the entire .NET runtime to the client-side.

b. Increased Bandwidth: Blazor WebAssembly apps can consume more bandwidth due to the larger payload size during the initial load.

c. Limited Real-Time Interactivity: Blazor WebAssembly applications need a connection to the server for real-time updates, potentially leading to higher latency.

6. Code Examples

Here’s a simple example of a Blazor component for both Blazor Server and Blazor WebAssembly:

Blazor Server Component:

@page "/counter"


<p>Current count: @currentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Increment</button>

@code {

 private int currentCount = 0;

 private void IncrementCount()






Blazor WebAssembly Component:

@page "/counter"


<p>Current count: @currentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Increment</button>

@code {

 private int currentCount = 0;

 private void IncrementCount()





7. Comparison Factors

a. Performance: Blazor WebAssembly offers better UI performance as the UI rendering is done client-side, while Blazor Server relies on server-client communication.

b. Bandwidth Usage: Blazor Server minimizes bandwidth consumption due to server-side rendering, while Blazor WebAssembly has a larger initial payload.

c. Real-Time Interactivity: Blazor Server provides real-time updates via SignalR, while Blazor WebAssembly requires server communication for real-time features.

d. Offline Support: Blazor WebAssembly works offline once the application is loaded, while Blazor Server requires an active connection.

e. Scalability: Blazor Server might face scaling issues with a large number of concurrent users, while Blazor WebAssembly offers better scalability.

8. Enterprise Support and Development Efforts

Both Blazor Server and Blazor WebAssembly are fully supported by Microsoft and have active communities and extensive documentation. However, the choice depends on your specific project requirements, team expertise, and the target audience.


In summary, Blazor Server and Blazor WebAssembly each have unique strengths and limitations. Blazor Server excels in real-time interactivity and seamless backend integration, whereas Blazor WebAssembly offers cross-platform compatibility, client-side execution, and enhanced performance. Consider your project’s needs, user expectations, and technical expertise when choosing between the two models.

A Comprehensive Comparison: Blazor vs. React vs. Angular

In the fast-evolving world of web development, choosing the right framework is crucial for building dynamic and interactive user interfaces. Three popular contenders in this space are Blazor vs React vs Angular. Each technology offers unique features, advantages, and use cases. In this blog post, we will provide a detailed explanation of each technology, including its architecture, features, and examples, to help you make an informed decision.

Lets compare Blazor vs React vs Angular

1. Blazor:

Blazor is a server-side web framework developed by Microsoft that enables developers to build web applications using C# and .NET. It follows the principle of server-side rendering (SSR), where the application logic runs on the server, and the client-side UI is updated through SignalR for real-time communication. Key features of Blazor include:

  • C# and .NET Integration: Blazor allows developers to leverage their existing C# and .NET skills, libraries, and infrastructure. This integration makes it a preferred choice for developers familiar with the Microsoft ecosystem.
  • Server-side Rendering: Blazor’s SSR approach reduces the initial page load time and provides better SEO support.
  • Real-time Communication: Blazor supports real-time communication through SignalR, enabling developers to build applications with live data updates and instant user interactions.

Sample “Hello World” Program in Blazor:

@page "/hello"

<h3>Hello, Blazor!</h3>

@code {

 protected override void OnInitialized()


 Console.WriteLine("Blazor: Hello World!");




2. React:

React is a JavaScript library developed by Facebook for building user interfaces. It follows a component-based architecture and uses a virtual DOM for efficient updates. Key features of React include:

  • Component-Based Architecture: React encourages the development of reusable and composable components, making it easier to manage complex UI structures.
  • Virtual DOM: React’s virtual DOM efficiently updates only the necessary changes to the actual DOM, resulting in better performance.
  • Large Ecosystem: React has a vast ecosystem with a multitude of third-party libraries, tools, and community support.

Sample “Hello World” Program in React:

import React from 'react';

function HelloWorld() {

 console.log("React: Hello World!");

 return (

 <h3>Hello, React!</h3>



export default HelloWorld;


3. Angular:

Angular, developed by Google, is a comprehensive web framework based on TypeScript. It follows a component-based architecture and offers powerful features for managing state, routing, and form validation. Key features of Angular include:

  • TypeScript: Angular leverages TypeScript’s static typing and features like decorators to provide a more structured and maintainable codebase.
  • Comprehensive Framework: Angular provides built-in support for many aspects of web development, including dependency injection, routing, form validation, and more.
  • Large Community and Ecosystem: Angular has a mature ecosystem with extensive documentation, ready-to-use solutions, and a strong community.

Sample “Hello World” Program in Angular:

import { Component } from '@angular/core';


 selector: 'app-hello-world',

 template: `<h3>Hello, Angular!</h3>`


export class HelloWorldComponent {

 constructor() {

 console.log("Angular: Hello World!");



Comparison Table:

Feature Blazor React Angular
Language C# and .Net JavaScript TypeScript
Rendering Server-side Client-side Client-side
UI Componentization Yes Yes Yes
Virtual DOM No Yes Yes
Performance efficient rendering Slower initial load, faster subsequent interactions Fast updates, efficient rendering Fast updates, efficient rendering
Learning Curve Low (if familiar with C#/.NET) Low Moderate
Ecosystem Growing ecosystem Vast ecosystem Mature ecosystem
Community Support Growing community Large community Large community
Use Cases Integration with .NET ecosystem, enterprise applications Wide range of applications Enterprise applications
Development Workflow Integrated with .NET Flexible Integrated with TypeScript
Latest Version Blazor 5.0 React 18.0 Angular 13.0
System Requirements .NET 5.0 or later Node.js, NPM Node.js, NPM


Each technology, Blazor, React, and Angular, has its own strengths and target use cases. Blazor is ideal for developers familiar with C# and .NET who want seamless integration with existing infrastructure. React’s component-based architecture and virtual DOM make it suitable for a wide range of applications. Angular is well-suited for building large-scale enterprise applications that require a comprehensive framework with powerful features.

When choosing the right technology, consider your project requirements, team expertise, and specific needs to ensure a successful development journey.