Logical Comparator
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Rather than recording every edit the designer makes, and then replaying them to update other design documents, Altium Designer uses a powerful comparator engine to detect any differences between the schematic and the PCB. The logical comparator detects changes to components and connectivity. Beyond comparing a schematic to its PCB, it can be used to check for differences between one revision of a board against another, a netlist and a PCB, two schematic sheets, and so on.