[epaga]

Very nice to have a native Mac app doing this!

A related tool would be a cross-platform product the company I work for creates: i-net PDFC https://www.inetsoftware.de/products/pdf-content-comparer

PDFC compares not only graphical differences but also detects content, columns, etc. We originally created it for ourselves because we weren't happy with any of the PDF comparison tools that were out there.