The QA team is the last frontier before your customers get their hands on your latest product version. Assuming your testing team has already completed smoke testing, integration tests, functional tests, end-to-end tests, acceptance tests and performance tests (not necessarily in that order) there’s still one piece of the puzzle: visual UI testing of your app front end.
The way many companies visually test their applications using image comparison tools. Some of these are free and some are paid. But in either case, these tools are not always reliable and often deliver false-positives (false alarms) that only frustrate both frontend developers and testers, and ultimately making you ship software late.