Systems | Development | Analytics | API | Testing

So your team just pushed a CSS update. All your functional tests pass, the deployment goes through, and everything looks fine in-browser. Two hours later, a user reports that the checkout button has disappeared on mobile. Technically, the button still works, but now it’s hidden just below the fold, so your tests had no way to flag the issue. This is what’s known as a visual regression, or visual bug, and it’s one of the most common ways UI problems slip into production unnoticed.

Website teams often use “testing” and “monitoring” in the same conversation, but they solve different problems. Website testing helps teams catch issues before changes go live. Website monitoring helps teams catch issues after the site is already in production.

Manual testing is essential to quality assurance, but it doesn’t always scale with fast release cycles. Clicking through forms, checking user flows, and repeating the same regression tests before every release can quickly become a bottleneck. Automation testing takes repetitive checks off your QA team’s plate. Instead of manually checking the same flows again and again, teams use testing tools to run predefined tests automatically.

Your website’s critical user flows are the lifelines of your business. A single broken button or unexpected error can send users packing — and that means lost revenue and a damaged reputation. Yet a lot of teams still rely on sporadic manual checks or basic uptime monitoring. The problem? Revenue-draining bugs love to hide in complex UI interactions that only show up under real browser conditions.