CSS Class Finder is a free Chrome extension designed specifically for developers, designers, and QA engineers to streamline the process of auditing CSS classes on web pages. This tool allows users to upload or link a JSON file containing target CSS classes or design system components. It scans the current page and any iframes for the specified classes, providing instant feedback on their presence and frequency of use. The results are displayed in a clear, color-coded table, enhancing the user experience with an accessible interface.

In addition to its scanning capabilities, CSS Class Finder offers visual annotations for matched elements, making it easier to identify and audit CSS usage. Users can customize their experience with over 100 annotation colors and can download a sample JSON file to quickly start using the tool. This extension is particularly useful for design system audits, accessibility reviews, and rapid prototyping, making it a valuable asset for anyone involved in web development.