Nelio A/B Testing and Google Analytics have different tracking methods, which means you may find differences in the number of visitors tracked from these tools. The following are some of the most commonly reported issues and their reasons:

«Pageviews» data in Google Analytics with «(Tested) Page Views» in Nelio give different results

«Pageviews» data in Google Analytics is the total number of visits on the website. Google Analytics tracks all visits to a page (both first-time visitors as well as revisiting users).

«(Tested) Page Views» in Nelio also implements this approach: it counts both first-time and revisiting visitors. However, not all visitors accessing a certain page are counted by Nelio. Only those visitors that participate in the experiment will be included in the results. Visitors may be excluded from an experiment if:

Google Analytics kicks in before Nelio does

Nelio A/B Testing includes a tracking JavaScript in all your pages. The tracking script is responsible of checking whether the current page is under test and, if it is, of loading the appropriate alternative (that is, of redirecting the visitor to a page that includes a GET parameter specifying the alternative to be loaded). In principle, this process is executed before Google Analytics kicks in before Nelio redirects the visitor, which means Google Analytics' code begins to execute on the original page itself. This could trigger an additional pageview on the original.