Google Analytics 4

Google Analytics 4 (GA4) measures how people interact with websites and mobile apps using an event-based data model, combining acquisition, engagement, ecommerce, audience, attribution, and cross-platform reporting within a property.

1. Measurement role: GA4 records interactions such as page views, clicks, purchases, and app activity as events. Web, iOS, and Android data streams can feed the same property, allowing teams to analyze behavior across sessions and platforms rather than organizing measurement primarily around pageviews.
2. AI and prediction: eligible properties can use machine-learning metrics including purchase probability, churn probability, and predicted revenue. These metrics can support predictive audiences and user-lifetime analysis, although availability depends on sufficient qualifying event data and model quality.
3. Implementation checks: teams should assess event and ecommerce tracking design, Consent Mode configuration, data retention, attribution settings, reporting identity, and whether raw event export to BigQuery is required for deeper analysis or long-term data use.
4. Commercial considerations: standard GA4 is available without a software license fee, while Google Analytics 360 is the paid enterprise tier. 360 increases limits for areas including audiences, event parameters, custom dimensions and metrics, API usage, Explorations, data retention, and daily BigQuery export.

GA4 is most useful when its measurement design is implemented carefully; incomplete ecommerce events, poor consent configuration, or inconsistent event structures can reduce the reliability of otherwise detailed acquisition and behavioral reporting.