May I access the VBA code in NumXL? Can I modify it?
NumXL is implemented in a compiled language (native C and C++), the VBA (in NumXLUI) is only used in the user forms (i.e. Wizards).
In sum, We don't grant access to the code, but we do stand 100% behind our calculation, so if you have a question about the algorithm or how did we arrive at any number, we will be more than glad to help you, and of course, if we uncover an issue on our side, then an update (with the fix) will push within a few days.