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Celebrating 15 Years in business!

Wicked Fast Components

EXT.NET is a premium .NET Web component framework powered by Ext JS.
🚀 Launch your web app to the next level with 140+ UI components, new Spotless theme, and 1000+ samples to help get your started.

Professionals around the world rely on Ext.NET

Thousands of developers in more than 90 countries build applications with Ext.NET.
Fortune 500 companies, banks, governments, and security organizations from around the world.

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10,000+ hour headstart with Ext.NET

Focus on your business logic and build your UI with battle tested web components

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.

Support for ASP.NET Core 3.1 including Razor Pages and MVC projects is now available with v7.0. Read more...

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 forums or StackOverflow.

Everything you need to build a killer app

Ext.NET provides all the features you expect from a modern component framework while working on your enterprise grade web application.

Solid client-server integration

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

Over 140 Components

Features over 140 Components and 925+ Examples.

Support you can count on

Dedicated, passionate team that’s always on hand.

Rich Client API

Fully integrates with Sencha Ext JS JavaScript library.

Large developer community

Collaborate with other Ext.NET users in the Forums and StackOverflow.

Get started right away

Ext.NET is free to Download at any time so that you can test its power.

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



Safari 6+

IE 8+

Opera 12+

Safari iOS6+

Chrome Android 4.1+

IE10+ Win 8

140+ Components, 925+ code examples

Ext.NET includes 140+ components and 925+ code examples, ready to use in your ASP.NET web application. Check out the Examples Explorer to view all samples with source code.

Examples Explorer

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.

Crisp Touch theme
Neptune Touch theme
Material theme

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 140 components for use in your application and ASP.NET WebForms and MVC are fully supported (including Razor).

Semantic code

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.

Ext.NET Web Application Development Book

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.

Ext.NET Editions

Two Ext.NET editions to choose from, Legacy or Classic.

Ext.NET Legacy
v5.3 Latest

Ext.NET Classic
v7 Available now
Ext.NET Core Engine
All new for .NET 5 & .NET Core 3.1

What do our customers say about us

Ext.NET is trusted by thousands of developers in 90+ countries all over the world!

I am sure you heard this before but your (EXT.NET) premium support is outstanding. You go above and beyond always. Thank you for your 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 look 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 Ext.NET 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 Ext.NET components, and we could not have done it without you guys.


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