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The XLL Plus Development Library is a toolkit that provides development tools and C++ class libraries that make it easy to generate Excel Add-in functions from your C and C++ code.

XLL+ lets you create XLL add-ins for Excel, written completely in C++. There is no need to write or to maintain any Visual Basic code at all.

Add-ins written in C++ perform faster than those written in VB. VB-authored add-ins often knock Excel over when they conflict with DDE updates. Add-ins written in C++ do not.

Writing add-in libraries using the Microsoft Excel SDK is difficult and tedious. XLL+ makes it easy. The XLL+ toolkit creates and maintains all the code that links your add-in functions to Excel. If you've got libraries written in C or C++, you can have the Excel add-in version up and running in half an hour, with features like error-handling and caching built-in right away.

XLL+ functions can automatically cache their results, providing orders-of-magnitude performance gains over VB-authored functions.

About XLL Plus
Why Use it?
Features