> that can track people as they go from one website to another Note that even in Google Analytics, this requires extra set-up, has limitations, and tends to be

> that can track people as they go from one website to another Note that even in Google Analytics, this requires extra set-up, has limitations, and tends to be pretty fragile in practice. GA identifies users by a first-party cookie and tracking cross-site visits requires decorating links with cookie values. If you're interested just in aggregate traffic from one of your sites to another, rather than something that requires full-path analysis (like marketing attribute), then you can get that from looking at referrers. This should be more-or-less equally available in GA and server logs.