Professionals around the world trust Ext.NET

Our quality service is approved by our clients across the globe. Here are just some of the organizations we have worked with.

hsbc logo
barclays logo
the us department of state logo
the us department of defense logo
hugo boss logo
jp morgan logo
bnp logo
united logo
disney logo
vmware logo
unisys logo
nato logo

What is Ext.NET

Ext.NET is an advanced ASP.NET (Web Forms + MVC) component framework integrating the cross-browser Sencha Ext JS JavaScript Library.

Who is it for

If you are looking to build a rich, modern web application with cutting edge web technologies, unparalleled cross-browser compatibility and an advanced MVC architecture then Ext.NET is for you!

Why should you use it

Ext.NET is built for developers, by developers. We provide hundreds of examples in our Examples Explorer. Need a little support? Check out our active community forums.

Everything you need to build a killer app

Rock solid client-server integration

Built with leading web technologies Ext JS and ASP.NET.

Rich Client API

Fully integrates with Sencha Ext JS JavaScript library.

Over 100 Components

Features over 100 Components and 600+ Examples.

Large developer community

Collaborate with other Ext.NET users in the Forums.

Support you can count on

Dedicated, passionate team that’s always on hand.

Get started right away

Ext.NET is free to download at any time.

Built for the web

Spending countless hours trying to make your app cross-browser compatible is a thing of the past with Ext.NET!

All our components are tailored to be 100% cross-browser compatible with all main stream browsers.

Chrome Logo


Firefox Logo


Internet Explorer Logo


Safari Logo

Safari 6+

Opera Logo

Opera 12+

Apple Logo

Safari iOS6+

Android Logo

Chrome Android 4.1+

Windows 8 Logo

IE10+ Win8

Ext.NET currently does not support phones
Ext.NET Examples Explorer

100+ Components, 600+ Code Examples

Ext.NET comes with 100+ components ready to use in your ASP.NET web application.

Built-in Theme Options

Ext.NET is built on top of Sencha Ext JS, the popular client-side JavaScript UI framework. This means all our components come with great theming options, allowing your app to fit together seamlessly with any design aesthetic. No need to have a designer or CSS expert on your team, simply choose a theme and start building great looking, usable interfaces with ease. With Ext.NET, worrying about cross-browser compatibility or user experience issues is a thing of the past.
theme screens
semantic code

Easy to Use, Semantic Codes

Ext.NET takes the pain out of building apps. Check out the Examples Explorer to see just how easy it is to build your next app with Ext.NET. There are over 100 components for use in your application and ASP.NET WebForms and MVC are fully supported (including Razor).

Always on Hand

We pride ourselves on being as available as possible to Ext.NET developers. … If you have any questions or would like to chat, don’t hesitate to get in touch.
Seamless Support
Ext.NET Web Application Development by Anup Shah

Now Even Easier to Learn

Ext.NET Web Application Development (published by Packt) makes learning Ext.NET easier than ever. Pick up a copy today and start building amazing ASP.NET applications with ease.
  • Build rich web applications using the power of Ext.NET.
  • Leverage Sencha’s popular Ext JS JavaScript framework to provide a full client-server web development experience.
  • Build polished working applications, with clear step-by-step instructions all the way.

Powered by cutting edge technologies

Ext.NET is powered by the latest technologies in the industry to provide you with the highest performance and productivity.
Sencha Logo
HTML5 Logo
CSS3 Logo
.NET Logo
Visual Studio Logo

This is a great product and their technical support via the forums is the best I have ever experienced in 25 years of development.