DiffPDF is described as 'Can compare two PDF files. It offers two comparison modes: Text and Appearance' and is an app in the development category. There are five alternatives to DiffPDF for Windows, Linux, Mac, iPad and Self-Hosted. The best DiffPDF alternative is Bluebeam Revu. It's not free, so if you're looking for a free alternative, you could try diffpdf fork or diff-pdf. Other great apps like DiffPDF are i-net PDFC and Compare It!.
Bluebeam Revu delivers award-winning PDF creation, editing, markup and collaboration technology to Windows desktop and tablet users. Create and navigate smart, information-rich document sets from converted Microsoft Office and CAD files.
Bluebeam Revu is the most popular Windows & iPad alternative to DiffPDF.
Bluebeam Revu is the most popular commercial alternative to DiffPDF.
Compare PDFs intelligently with i-net PDFC. It detects content differences—not just text or images—and displays them beautifully, like holding two pages to the light.
i-net PDFC is the most popular Mac, Linux & Self-Hosted alternative to DiffPDF.
Easily compare and merge text files; compare doc, xls and pdf files; prepare comparison reports and printouts.
diffpdf fork is the most popular Open Source & free alternative to DiffPDF.
diff-pdf is a free, older version of the paid tool DiffPDF.
Both work very well and quickly as long as the PDFs have the same number of pages, and as long as differences are only present on pairs with the same page number.
DiffPDF can also compare PDFs with different page counts. However, this leads to a much longer program runtime for the comparison if the number of pages is high, since the program then compares every page of one document with every page of the other document.
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Seems like Bluebeam can't diff PDFs