Add-in Express Toys: VSTO & Excel .NET Add-in Development

Key Features

• This is a free sample add-in (ready to install and use) that adds a number of useful features to Microsoft Excel.
• The add-in is based on the innovative Add-in Express technology and gives you an example of developing Excel add-ins, creating custom toolbars and controls and accessing Excel objects.
• The add-in contains a full source code in VB, C# and supports Excel 2003 and Excel 2007.
• It works in VSTO 2005 SE and VSTO 2008 (VB.NET, C#).

Technical Specifications

• **Publisher:** Add-in-express.com
• **License:** Freeware
• **Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
• **Last Updated:** October 15, 2025
• **Category:** Programming / C++ Tools