CSS Stats is a free and open source tool that's used by many companies and projects. It's intended to help CSS authors visualize their stylesheets and generate documentation for a design system.
CSS Stats analyzes a web page and finds all stylesheets (linked or embedded) and combines them. The resulting CSS is then analyzed and returned. The CSS Stats dashboard turns the data into digestible bits of information. You can also use the API endpoints to use the raw data in custom apps or dashboards.
CSS is a complex topic, so we've provided an ever growing series of articles: