Optimum

This plugin allows the user to conduct server-side A/B testing in CraftCMS. As opposed to client-side testing (e.g using Google Optimize), the test variant is rendered on the server-side, resulting in better UX, performance and enhanced flexibility.

Once an experiment is set the data is automatically sent to Google Analytics 4 as a custom dimension. You then have the full power of analytics to compare the test cohorts across different metrics (e.g conversion, engagement etc.)

Click here for a live example. Page will load 6,9, or 12 posts (9 being the original variant).