DiffPDF is described as 'Can compare two PDF files. It offers two comparison modes: Text and Appearance' and is a File Comparison tool 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 diff-pdf or diffpdf fork. Other great apps like DiffPDF are i-net PDFC and Compare It!.
Versatile PDF solution for Windows with editing, markup, batch creation from Office and CAD files, 3D PDF, OCR, forms, advanced organization, custom measurement, real-time collaboration, scripting, security, file comparison, tablet support, and integration features.
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.
Easily compare and merge text files; compare doc, xls and pdf files; prepare comparison reports and printouts.
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