
Discrepenecies between Google Analytics, Plausible, and Posthog pageviews/unique users
Hi there! We've been running Posthog alongside some of our other analytics tools for both our marketing site and web app. After a few weeks of that, we've found that Posthog is reporting both pageview total count and pageviews aggregated by Unique users that are consistently ~20% (+/- a few percent) higher than Google Analytics, and ~15% higher than Plausible, when filtering by current URL. Our working theory is that's due to adblockers blocking Posthog less, but that amount seems high. Is that a known phenomenon, or could there be something else going on? Thanks in advance!
- James2 years ago
GA downsamples thus is inherently unreliable.
Plausible samples seemingly inconsistently based on traffic volumes, which is documented a little here.
We don't downsample at all at this stage. Further, Adblockers will cause discrepancies, but you can put PostHog behind a proxy to remove this effect.