The software we use for visual regression testing uses a sophisticated model that has been run millions of times on sites to be trained to detect even the smallest changes before and after updates.
First, we check for any critical errors, if there is a critical error we rollback the changes. Next, we take screenshots of up to twenty pages of your site and do an image comparison to look for changed pixels. If there are changed pixels, we run the data through our machine learning model to see if the pixel changes are substantial enough to roll back the site. In the scenario of a site rollback, our Support Team steps in to troubleshoot.
