CSS Stats

A free, open-source tool for generating analytics and visualizations of a website’s stylesheets. By analyzing a website’s CSS, it provides developers with valuable insights into the size, complexity, and maintainability of their code. This information helps to improve design consistency, track performance, and proactively diagnose complex issues.

What CSS Stats analyzes

When you input a URL into the CSS Stats tool, it audits the web page’s stylesheets and presents the data in a visual dashboard. The tool provides metrics on several aspects of a site’s CSS, including:

• Specificity graphs: These charts show how specific your CSS selectors are. Higher and more complex specificity can indicate potential maintenance problems. A flatter, lower score is generally better for the long-term maintainability of your CSS.
• Colors: A visual overview of all the colors used on a page. This can help identify inconsistencies, such as using multiple very similar color codes instead of a single variable.
• Font information: Details on the different font families, sizes, and weights used. This helps designers and developers check for consistency in a site’s typography.
• Rules and declarations: Audits the total number of CSS rules and declarations, as well as the average size of your rules.
  Selector breakdown: Categorizes the different types of selectors used, including classes, IDs, and element selectors.
• This helps ensure your project is following intended naming and styling conventions.
  Size and repetition: Measures the overall size of your CSS and highlights repetitive or redundant code.

How developers use CSS Stats

Developers and designers use CSS Stats to gain a better understanding of a codebase, especially when working in a large team or building a design system. Its primary use cases include:

• Auditing and refactoring: Before starting a major code cleanup, a developer can use the tool to identify bloat, inconsistencies, and overly complex styles.
• Improving consistency: For design teams, the color and font reports can reveal if designers and developers are adhering to the established brand guidelines.
• Optimizing for performance: By highlighting unused declarations, complex selectors, and large file sizes, the tool helps developers make changes that can improve page load speed.
• Generating documentation: The statistics and visualizations can be used to generate documentation for a project’s design system.