Take the pain out of building site search with the Algolia hosted API. Start free now! Auditing CSS is not a common task in a developer’s everyday life, but sometimes you just have to do it. Maybe it’s part of a performance review to identify critical CSS and reduce unused selectors. Perhaps is part of effort to improve accessibility where all the colors used in the codebase evaluated for contrast. It might even be to enforce consistency! Whatever the case and whenever that moment arrives, I usually reach for some of the tools I‘ll cover in the article. But before that, let’s see what it even means to “audit” CSS in the first place.