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ASP.NET

Free. Cross-platform. Open source.
A framework for building web apps and services with .NET and C#.

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Supported on Windows, Linux, and macOS

Web Apps

Build full stack web apps with HTML, CSS, JavaScript, and C#

APIs

Develop REST APIs for a range of clients, including browsers and mobile devices

Real-time

Enable bi-directional communication between server and client, in real-time

Microservices

Create independently deployable microservices that run on Docker containers

What is ASP.NET?

.NET is a developer platform made up of tools, programming languages, and libraries for building many different types of applications.

ASP.NET extends the .NET developer platform with tools and libraries specifically for building web apps.

Dig deeper: What is ASP.NET?

Learn ASP.NET

Learn about all ASP.NET has to offer with our tutorials, video courses, and docs.

Learn to use ASP.NET

Fast and scalable

ASP.NET performs faster than any popular web framework in the independent TechEmpower benchmarks.

In the TechEmpower benchmarks, .NET processed 7.01 million requests per second, Node.js processed 0.66 million, and Java Servlet processed 2.17 million.

Data sourced from official tests available at TechEmpower Round 20.

Build secure apps

ASP.NET supports industry standard authentication protocols. Built-in features help protect your apps against cross-site scripting (XSS) and cross-site request forgery (CSRF).

ASP.NET provides a built-in user database with support for multi-factor authentication and external authentication with Google, Twitter, and more.

Active community and open-source

Get quick answers to questions with an active community of developers on Stack Overflow, ASP.NET forums, and more.

NET is open source on GitHub, with over 100,000 contributions and 3,700 companies already contributing.

Join the .NET community

Free hosting on Azure

Get 10 ASP.NET websites for free with Microsoft Azure.

You can also deploy to any major cloud platform, your own Linux or Windows servers, or one of many hosting providers.

Host for free with Azure

The Stack Overflow logo — the word Stack Overflow next to an icon of a paper tray with papers spilling out of it. Stack Overflow is a customer of .NET. The Postage logo — The word The in red on top of an aqua box with the word Postage inside. The Postage is a .NET customer. The AMPAS logo — A golden triangle with the Oscars award silhouette in white inside with the word AMPAS in golder under it. AMPAS is a .NET customer. The GoDaddy logo — a man wearing green glasses and orange hair and the word GoDaddy in black letters. GoDaddy is a customer of .NET. The Siemens Healthineers logo — The word Siemens in light green on top of the word Healthineers in orange next to an illustration of orange dots. Siemens Healthineers is a .NET customer.

Read customer stories

Ready to Get Started?

Our step-by-step tutorial will help you get ASP.NET running on your computer.

Supported on Windows, Linux, and macOS

Get Started