Google Analytics 4 formerly known as App + Web is a new version of Google Analytics that was released in October 2020.
https://support.google.com/analytics/answer/10089681?hl=en
Analytics and Tracking
We know of 15,271,134 live websites using Google Analytics 4.
Google Analytics 4 websites that are also using other technologies.
We know of at least 15,271,134 live websites using Google Analytics 4.
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