We are very glad that you like the program! Unfortunately, we can't make it work with any free online spreadsheet programs because we use specific APIs that require Windows OS hooks. MyCostPro should be compatible with older versions of Excel back to 2007, so I would imagine you could find an outdated version for a nominal price. The security questions on the forum are definitely annoying but unfortunately necessary due to constant spam otherwise. Good luck and happy eBay selling!