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Technology · Web Development

Microsoft ASP.NET

asp.net

ASP.NET Core is a framework for building web apps and services with .NET and C#. It is free, open source and runs on Windows, Linux and macOS.[1]

ASP.NET is a robust, open-source, server-side web application framework developed by Microsoft. It's designed for building dynamic web pages, web applications, and web services. ASP.NET extends the .NET developer platform with tools and libraries specifically for building web apps. It supports multiple programming languages, including C#, F#, and Visual Basic, allowing developers to create scalable and high-performance web applications. ASP.NET offers various frameworks like ASP.NET Web Forms, ASP.NET MVC, and ASP.NET Core, catering to different development approaches and requirements.

Microsoft ASP.NET belongs toWeb frameworkscategory.

Price

Free and open source[1]

Runs on

Windows, Linux and macOS[1]

Web UI

Blazor components in C#[1]

Security

Built-in XSS and CSRF protection[1]

79websites

use it — 3.1% of the 2,560 websites we scanned in the last 12 months

#3of 25

tools in its category seen in our scans (we recognize 105)

17public pages

on UptimeCard — open any of them to see how that site is doing

In short: A free, supported choice for teams that write C#; a new major version ships every November, and only even-numbered ones get three years of support.[2]

3.2% of all websites we track run Microsoft ASP.NET▼ 0.01 points since 20 Sep

Should you use Microsoft ASP.NET?

The 10-second version, from the vendor’s own pages and what we see in our scans

Microsoft ASP.NET fits if…

  • Teams that already write C# and want web apps and REST APIs on one stack.[1]
  • Apps that need real-time, two-way communication between server and client.[1]

Look elsewhere if…

  • Teams without C# skills may find a framework in their own language a closer match.[1]
Odd-numbered releases get free support for a shorter period than even-numbered ones.[2]
Versions that leave the support policy stop receiving patches, so plan an upgrade each cycle.[2]

Products

On the ASP.NET Core page

ASP.NET Core

This page

The web framework for apps and services with .NET and C#.[1]

Blazor

A web UI framework built into ASP.NET Core.[1]

Support and help for Microsoft ASP.NET

How the vendor says you can reach it, and the public help community

Community Q&A

Developers get answers on Stack Overflow and Microsoft Q&A.[1]

Stack Overflow

372,795 questions[5][6]

70% have an upvoted answer. [asp.net] questions

Microsoft ASP.NET versions

The newest release, the series that still gets fixes, and what changed

Latest release

10.0.13[3]

Released 13 Oct 2026

Maintained series

10

.NET 10 is an LTS release supported until November 2028.[4]

What Microsoft ASP.NET sites add on top

How many of the 79 Microsoft ASP.NET sites we scanned also run each tool, grouped by what the tool does

Analytics

Google Analytics
56%44 sites
Linkedin Insight Tag
30%24 sites
Facebook Pixel
23%18 sites

Tag manager

Google Tag Manager
56%44 sites

Cookie consent

OneTrust
20%16 sites
Funding Choices
9%7 sites

The full bar means every Microsoft ASP.NET site. A site can run several tools for one job, so the shares of tools in one group can add up to more than 100%.

How Microsoft ASP.NET sites protect themselves

Share of the 79 sites we scanned that run each protection

HSTS62% · 49 sites

HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS

reCAPTCHA17% · 13 sites

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse

Cloudflare Bot Management9% · 7 sites

Cloudflare bot management solution identifies and mitigates automated traffic to protect websites from bad bots

Protections add up, they do not replace each other: a site can run all of them.

What sites use Microsoft ASP.NET for

An estimate from UptimeCard's technology map of 15 public sites

Runs the whole site12 sites

abbyy.com · authorize.net · autotrader.co.za

Runs a shop or catalog2 sites

faithlife.com · guidewire.com

Runs the marketing site1 sites

octopus.com

Rough guide, not a measurement: each description is written automatically from the site’s technology stack and the site has not confirmed it. A site is counted once, in the first group its description fits (shop, help and docs, blog, marketing site; otherwise the whole site). Descriptions that only guess (“likely”, “may”) are left out.

At a glance

UptimeCard's own scans and tests of 2,560 websites · refreshed weekly

How Microsoft ASP.NET sites scoreout of 100 · hover or tap a score for details

52PerformanceLowaverage site: 5091AccessibilityGoodaverage site: 8995Best practicesGoodaverage site: 9392SEOGoodaverage site: 92

Page load time

Loads about 9% faster than the average site

Microsoft ASP.NET sites
3.9 s
All sites
4.3 s

Most Microsoft ASP.NET sites load in 3.1–6.3 s. Home page weight: 3.1 MB vs 3.3 MB for all sites. 16 public sites measured.

Who uses it?

Technology and Software is the biggest group

Technology and Software35%
Educational Resources18%
Software as a Service (SaaS)18%
Business Services6%

Share of 17 classified public sites. “× average” compares with all 961 public sites.

How Microsoft ASP.NET sites are built

Closest partners. The number says how many times more often the tool runs on Microsoft ASP.NET sites than on an average website. Hover a partner for its share of sites.

Sitecore32×Optimizely Content Management32×IIS24×Windows Server24×Azure Monitor14×Azure12×Azure Front Door11×Modernizr4×theTradeDesk4×

Stacks we see most. Tools that tend to run together with Microsoft ASP.NET on the same websites. The percentage is the share of all 79 Microsoft ASP.NET sites that run the whole stack.

6 stacks · swipe, drag or use the arrows
#1

Microsoft ASP.NET + Bootstrap + DigiCert

11.4%9 of 79 sites
#2

Microsoft ASP.NET + Bootstrap + Sitecore

8.9%7 of 79 sites
#3

Microsoft ASP.NET + DigiCert + Sitecore

8.9%7 of 79 sites
#4

Microsoft ASP.NET + Bootstrap + cdnjs

7.6%6 of 79 sites
#5

Microsoft ASP.NET + Bootstrap + Google Hosted Libraries

7.6%6 of 79 sites
#6

Microsoft ASP.NET + DigiCert + Optimizely Content Management

5.1%4 of 79 sites

Similar tools in its category

Web frameworks: 105 tools known, 25 seen in our scans

Next.js375 sitesAlternativeMarko149 sitesAlternativeNuxt.js47 sitesAlternativeExpress36 sitesAlternativeRuby on Rails25 sitesAlternativeYii21 sitesAlternativeLaravel12 sitesAlternativeDjango8 sitesAlternative

How websites combine Microsoft ASP.NET with other tools

Relationships found on the websites that use it, from the same map status pages show.

Built on a platform 11Integrates with another 9Needs another tool 8Complements another tool 5Overlaps with another 1

Websites using Microsoft ASP.NET

79 websites use Microsoft ASP.NET: 3.1% of the 2,560 websites we scanned in the last 12 months. A selection is shown below.

Scores are out of 100: P Performance · A Accessibility · B Best practices · S SEO. Green 80+, yellow 65–79, orange 50–64, red below 50. The dot shows whether our last scan found the site failing (red) or not (green); Red, amber or blue: an active incident on the site's status page (outage, degraded, maintenance) or a failing scan; amber also means a certificate ending within 30 days. Hover the dot for details.

Who is behind Microsoft ASP.NET

From its own pages and public records, with sources

Its story

  1. 2016

    ASP.NET Core 1.0 shipped in June 2016 as a leaner, modular, cross-platform rewrite of ASP.NET that no longer needs System.Web.dll.[7]

  2. 2017

    ASP.NET Core 2.0 reached general availability in August 2017. A single metapackage replaced the long list of individual package references.[8]

  3. 2020

    .NET 5.0 shipped in November 2020 and started unifying .NET. Server developers moving from .NET Framework had to adopt ASP.NET Core, and Web Forms developers were pointed to Blazor.[9]

  4. 2021

    .NET 6 arrived in November 2021 with minimal APIs for simpler HTTP services and HTTP/3 support across ASP.NET Core, HttpClient and gRPC.[10]

  5. 2023

    .NET 8, an LTS release, came in November 2023. Blazor could now use server and client together for all web UI needs, as full stack web UI.[11]

  6. 2025

    .NET 10 launched in November 2025 as an LTS release supported until November 10, 2028. ASP.NET Core Identity gained passkey support for passwordless sign-in.[4]

Questions about Microsoft ASP.NET

Is ASP.NET Core free?
Yes. The page describes it as free, cross-platform and open source.[1]
How long is each release supported?
Even-numbered releases are LTS and get free support and patches for three years; odd-numbered ones get two years.[2]
How often do new versions come out?
A new major release of .NET is published every year in November.[2]
How many websites use Microsoft ASP.NET?
We found Microsoft ASP.NET on 79 of the 2,560 websites we scanned in the last 12 months (3.1%). 17 of them have a public status page.
What is Microsoft ASP.NET often used with?
Among the websites we scan, Microsoft ASP.NET is often found alongside Linkedin Insight Tag (30.4% of its sites), Bootstrap (29.1% of its sites), DigiCert (27.8% of its sites).
What are the alternatives to Microsoft ASP.NET?
Other web frameworks tools we recognize include Next.js, Marko, Nuxt.js, Express.

Is your website built with Microsoft ASP.NET?

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