[madengr]

>Do they automatically re-tune differential pairs after you move things around?

Yes, in fact they can length re-rematch groups of differential pairs.

Altium does not have built in SI analysis, but it does have optional DC PI analysis, and likely AC in the future.

Most SI and PI are point tools anyway, so even if you use Cadence, it’s not built-in, rather requires importing into another tool.