Package diffpdf

PDF files comparator

http://www.qtrac.eu/diffpdf.html

DiffPDF is used to compare two PDF files. By default the comparison is
of the text on each pair of pages, but comparing the appearance of pages
is also supported (for example, if a diagram is changed or a paragraph
reformatted). It is also possible to compare particular pages or page
ranges.

General Commands (Section 1)
diffpdf
A GUI program that compares two PDF files and shows their differences. The files are optional and are normally set through the user interface.