From Formula Software:
Excel Compare is a tool that saves you the trouble of manually searching for differences and offers you computer-aided comparing of Excel files. Excel Compare is a tool that allows you to compare Excel files, Excel spreadsheets, and selected ranges of sheets. Excel Compare compares data straight from your worksheets and presents the results on a new Excel sheet as a publication-quality report (difference report) that is ready to print or save. The report displays the added, deleted, and changed data. Use this tool for analyzing the changes made.