Visual bugs are typically considered easy to spot. You can often see what’s missing or what’s amiss on a web page.

A photo that’s too much to the left, the wrong fonts, a missing button -- these are things that you can spot at a simple glance. But not all visual bugs are that easy to catch, especially not with the naked (or untrained eye).

This is where automated visual regression tools like Diffy come into play. They can help you spot elusive visual bugs easily, even if you have to test hundreds of pages.

User acceptance testing (UAT) is the ultimate decider of how your target audience will react to your product. Although a type of functional testing, the point at which UAT testing is performed makes it an imperative in the SDLC.