Hello,
I have been running Piwik Pro side-by-side with GA3 for a couple of days now for (https://www.fvdublin.org). Yesterday was the first day of complete data. Both platforms were pretty close in the total sessions count, but Piwik’s distribution among the mediums/channels is wildly different from GA3. Here’s direct versus organic breakdown (direct/organic) for all both for the same 24 hours:
GA3: 8/48
Piwik: 18/35
In taking a look at the Organic sources in Piwik, the difference in visits from search engines tells an interesting tale:
GA3:
google - 26
google my business (landing page is decorated with UTM codes) - 18
yahoo - 3
duckduckgo - 1
Piwik:
google - 19
google my business (landing page is decorated with UTM codes) - 11
baidu - 2 (this likely shows because the GA3 view has a “USA only” filter)
yahoo - 2
duckduckgo - 1
It seems to be that Piwik is categorizing some Google Organic visits as Direct.
For additional comparison, Plausible has the following distribution for direct/organic so it’s even less aligned with GA3:
Plausible: 45/16