XOR 4+

XOR is a real-time PDF comparison viewer. It instantly show the differences between the two PDF pages. It is very easy to use and it does not overlook any changes.

XOR is a real-time PDF comparison viewer. It instantly finds out the differences between the pages of two PDFs before and after the correction. It is very easy to use and never overlook any changes. This allows users to improve the quality of print production and cut costs by reducing the time required.

The new version automatically detects pages that have not changed and displays the label "Unchanged" overlaid on them.

And the ability to display changes in red like a thermography has been added.

XOR is a subscription service, so you can cancel and re-subscribe at will. There is no USB dongle for copy protection, and you can use it at office, home, or even while traveling with the same Apple ID, making it ideal for telework and emergency response. There is a 30-day free trial period.