DiffPDF

DiffPDF can compare two PDF files. It offers two comparison modes: Text and Appearance.

9 Alternatives To DiffPDF

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Altova DiffDog

Altova DiffDog is a powerful, easy-to-use diff merge tool that lets you quickly compare, merge, and sync text or source code files, folders containing any file type, or entire directories.
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Diff Checker

Diff Checker is a free online diff tool that quickly and easily gives you the text differences…

DiffPlug

DiffPlug is a multi-functional and multi-platform tool that is expert in performing two basic functions of editing and differing for text images and much more.
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FileMerge

Xcode includes the Xcode IDE, Instruments, Simulator, the latest macOS, iOS, watchOS, and tvOS SDKs, and more. View the many features included with Xcode.

GNU Diff Utilities

GNU Diffutils is a package of several programs related to finding differences between files.

Meld - Mac Port

This is actually Meld itself ported to Mac.

Text Comparator

Compare text from two distinct sources in order to see if they perfectly match or not each other!

Tkdiff

tkdiff is a graphical diff viewer based on the Tk framework.
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vimdiff

CLI Visual Merge/Diff tool