Merge is the visual file comparison (diff), merging and folder synchronization application from Araxis. Use it to compare and merge source code, web pages, XML and other text files with native application performance.
DiffEngineX is a fast utility that finds the differences between the formulae, constants, defined names, cell comments and Visual Basic code contained in either two whole Excel workbooks (*.xls, *.xlsx, *.xlsm, *.xlsb) or selected worksheets.
This is a tool developed by a small team in the Netherlands. It's a standalone application that generates a simple, concise, easy to understand overview of the differences between 2 Excel sheets. It can also handle even the most complex Excel files.