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Professionals around the world rely on Ext.NET

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.

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.

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 modern web browsers.




Safari 6+

Opera 12+

Safari IOS6+

Chrome Android 4.1+

IE10+ Win 8

Ext.NET now supports Mobile devices including Phones and Tablets. Read More…
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115+ Components, 925+ Code Examples

Ext.NET comes with 115+ components and 925+ code examples, ready to use in your ASP.NET web application.

See Examples Explorer to browse all examples with source code. themes screenshots

Easy Customization with 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.

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Semantic Code

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). web application development

Learning Ext.NET is Easy

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. forums screen shot

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.

Everything You Need to Build a Killer App

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 so that you can test its power.

What Do Our Customers Say About Us

We are trusted by hundreds of customers in more than 90 countries all over the world!

I am sure you hear this before but your (EXT.NET) premium support is outstanding. You go above an beyond always. Thank you for you help in our EXT upgrade.

Ext.Net is the true productivity multiplier and it is an amazing experience to discover. For that I am grateful.

Great product and great support. You all make me looked like a WIZARD when I show the sites I develop to the customer.

I just wanted to say that, without a doubt, I have never had support as great as I have had with the team after becoming a Premium Member.

I wanted to say thanks to all the great support staff at EXT! We are close to wrapping up our first project using controls, and we could not have done it without you guys.

When having premium support you get quick response here on the forum and usually in-depth examples and help which is much appreciated.