Another Mac utility worth your attention: Alexander Jaehrling’s PDF Diff is a $20 app for comparing the text differences between two PDFs. Last July I asked:
What’s the best tool for diffing PDF files? Is it Acrobat? Tell me it’s not Acrobat. But if it’s Acrobat OK I’ll break a years-long streak and install Acrobat.
PDF Diff wasn’t out at the time, but I wish it had been. It’s the best tool I’ve found for this.