AkinTM is a free application which lets you compare Excel worksheets. If you cannot remember what changed between two versions of a workbook, simply open them with Akin: it will help you compare them and find all the differences between the workbooks.
Zoom in on differences:
click on rows or columns headers, and Akin hides identical cells, and displays only areas where differences exist, allowing you to focus on changes and navigate quickly through large worksheets.
Compare Values and Formulas:
Akin can perform comparisons between the values of two worksheets, to find changes in inputs, but also between formulas, to identify differences in model structure.
Summary of Differences:
as soon as you select two sheets, Akin displays a high-level summary of their differences, allowing you to decide at a glance whether it is worth diving into deeper analysis.