@plausible I observed the same on some high-ish profile sites that I managed, where we had both GA and Matomo.
In our set-up Matomo used log analytics, so there was no way to block it from counting a visit.
The difference was not that large, about 30% from what I recall.
I wonder how much of it is people blocking trackers, and how much is different math used on GA side? GA math (what is counted as a "visit", etc) has always been *magic*, and I don't mean it in a good way.
@rysiek @chris thank you! there's also this thread on our github on the topic of supporting server logs https://github.com/plausible/analytics/discussions/234
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