Create Internet Explorer extension /plug-in
for IE6 - IE11: VB.NET, C# and C++

Add-in Express™
for Internet Explorer® and Microsoft® .net

This product is discontinued and no longer available for sale. This page is only available for reference.
Add-in Express for Internet Explorer and .net at first hand


  • Visual Studio 2010 - 2019
  • Visual Basic .NET
  • Visual C# .NET
  • Visual C++ .NET
  • Express Editions are not supported


  • Internet Explorer 6
  • Internet Explorer 7 (32-, 64 bit)
  • Internet Explorer 8 (32-, 64 bit)
  • Internet Explorer 9 (32-, 64 bit)
  • Internet Explorer 10 (32-, 64 bit)
  • Internet Explorer 11 (32-, 64 bit)

Add-in Express for Internet Explorer is the only all-in-one framework that offers you a simple and quick way to customize Microsoft Internet Explorer with your own browser extensions. It completely supports the Internet Explorer Extensibility API and provides a coherent set of .net components, visual designers and deployment tools that make your IE add-on development and deployment very comfortable.

Screenshots gallery

You write applied code only

Add-in Express is based entirely on the Rapid Application Development approach and empowers you to develop professional extensions for Internet Explorer with a couple of clicks. Add-in Express is written in C#, its programming model and run-time code are based on the Internet Explorer SDK and thus far provide the most effective way to extend the IE GUI, access Internet Explorer objects and handle their events.

Written in C#, optimized for IE 7 multi-threaded and IE 8 "multi-processed" architecture, and speeded up for IE 9, IE 10 and IE 11 load time requirements, Add-in Express wraps the Internet Explorer Extensibility API with a strong programming model and an elegant solution design. Now you can simply use IE-specific modules and components instead of digging through technical articles on the web. Just run the Add-in Express IE solution wizard, create your project, tune the deployment scenario and start your work - do coding. Forget about COM-interfaces, registry, JavaScript, IE threads and processes - merely concentrate on your own applied code!

Key features and benefits

Internet Explorer extensibility

Based on the Internet Explorer Extensibility, Add-in Express provides you with an integrated solution that allows adding your custom menu items, toolbar buttons, context menus, toolbars, side-bars and keyboard shortcuts to the Internet Explorer GUI. Learn more...

Integrated solution in focus

Add-in Express integrates all Internet Explorer Extensibility features in one solution with a strong architecture and a lucid interaction model with Internet Explorer objects. You needn't follow the IE SDK way with separate ActiveX-es, script files and registry keys. Learn more...

Visual designers

Add-in Express provides a component-centric model for programming IE add-ons. You use visual designers and components for customizing the Internet Explorer menu, toolbars or side-bars, and for accessing Internet Explorer objects and their events. In addition, all your IE plug-ins are script-enabled. Learn more...


Add-in Express includes a version-neutral Internet Explorer interop assemblies based on the IE 6 type library. With these assemblies you make your add-ons compatible with the most popular Internet Explorer versions, from IE6 through IE11. One code, one project, one solution, one deployment package for all IE versions. Learn more...

32 and 64 bits in one project

Add-in Express delivers its own 32-bit and 64-bit add-on loaders, automatically includes them in add-on setup projects and registers the loaders for both Internet Explorer versions, 32- and 64-bit. The loaders run your add-ons and isolate them in their own app domains. All this makes your add-ons x86 and x64-compatible, secure and isolated. Learn more...

Deployment experience

Deployment is the premium feature of all Add-in Express projects. Each of your Add-in Express based plug-ins is msi-based and web-enabled. Just build your IE extension and its setup project and publish the resulting MSI to your deployment server. Learn more...

Deep integration with MS Office add-ins

Add-in Express adds a special template to MS Office add-in projects based on Add-in Express for Microsoft .NET. It enables you to create Office add-ins and Internet Explorer add-ons with the common code base in the framework of one project. Learn more...

True RAD - you write applied code only

Add-in Express is completely based on the True RAD paradigm and reduces the time you spend on COM interfaces, IE-related registry entries and IE add-on deployment. You write applied code only, Add-in Express implements everything else. Learn more...