Compare Excel Spreadsheets I would like to compare two excel spreadsheets. I have found many Windows-based solution but nothing for Mac OS X.
Are you aware of


a build-in way to perform a diff (didn't find much in the help)
a standalone tool (for Mac)
an online tool (data is not sensitive, comparing in the cloud would be no problem)


At the moment the only solution I got is exporting to a comma separated file and compare with diff on the command line. I was thinking to write a small Perl script but before investing too much time I wanted to be sure I am not missing a simpler option.
Usually what I would do is copy the Excel spreadsheets into Word, then use Word's Merge Documents feature (might have been Merge/Compare or simply Compare Documents previously to 2011) to see the differences between them. Depending on how big your spreadsheet is, however, that might not work for you.