Add-in Express for Microsoft Office and .net

Develop plug-ins for all Office versions and applications with a single code base

Add-in Express for Office and .NET is the largest and most complete toolset for developing any types of Microsoft Office extensibility projects. Use visual designers and special components of this toolset to write shared, secure, version-independent and easy deployable Office COM add-ins, smart tags, Excel RTD servers, Excel user-defined functions (UDFs), Excel Automation addins and XLL with little coding.

  • Office versions: Office 2024 2021, 2019, 2016, 2013, 2010, 2007, 2003, XP and 2000
  • Applications: Outlook, Word, Excel, PowerPoint, Access, FrontPage, Publisher, Project, MapPoint, InfoPath, Visio, OneNote
  • IDEs: Visual Studio 2022, 2019, 2017, 2015, 2013, 2012 (VB.NET, C#, C++)

Creating advanced Excel GUI Outlook plug-in development Visual designers

Add-in Express in action

Our frameworks have powered a wide range of products designed to enhance Microsoft Office applications. Below are our flagship end-user solutions built using Add-in Express technologies.

Ablebits Ultimate Suite for Excel logo

Ultimate Suite for Excel

A collection of more than 70 add-ins designed to simplify and speed up everyday Excel tasks.

Ultimate Suite helps users combine data from different sheets, compare tables for matches and differences, find and remove duplicates, clean up worksheets, split cells, and automate many other routine actions.

  • Supported versions: Excel for Microsoft 365, Excel 2024 – 2019
Shared Email Templates for Outlook logo

Shared Email Templates

First introduced as a simple Template Phrases add-in for desktop Outlook, it has evolved into a flexible, cross-platform tool for creating personalized email templates and sharing them across devices and teams.

With built-in macros, conditional IF sections, and support for regular expressions, Shared Email Templates lets users build intelligent, dynamic templates that automatically adapt to each recipient and situation. It's useful for both individual and team communication.

  • Supported versions: Outlook for Microsoft 365 (classic and new), Outlook for Windows 2024 – 2019, Outlook for Mac 2024 – 2021, Outlook on the web