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CSS & UI Engineering

8 free browser-based tools

CSS analysis, specificity, design tokens, duplicate rules and contrast checks

All CSS & UI Engineering

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Analyze CSS for selector count, media queries, custom properties and rule complexity.

Calculate selector specificity for CSS selectors and compare override risk.

Find long, deep or expensive selectors that can hurt maintainability.

Extract CSS custom properties and show duplicate token names and fallback usage.

Find repeated CSS selectors and duplicate declaration blocks for cleanup.

Format or minify CSS with safe whitespace handling and size comparison.

Extract color, spacing, radius and shadow tokens from CSS into JSON-ready groups.

Check foreground/background color contrast against WCAG ratios for UI text.