Color Contrast Tool

The Color Contrast Tool analyzes the accessibility of text against backgrounds by computing WCAG-compliant contrast ratios. It accepts two color inputs in common formats, a font size, and optional font weight or line height. The primary use case is to validate that body text, headings, links, and UI labels meet minimum readability thresholds for web content.
Conceptually, the tool converts colors to relative luminance in sRGB space, applies the WCAG formula, and reports a numeric ratio plus a compliance level (AA or AAA). It also suggests practical adjustments, such as adjusting colors or increasing text size, to reach a target ratio. This supports designers during color decisions and developers during implementation.
Who benefits: accessibility specialists, product teams, QA engineers, and content writers. Why unique: it combines exact WCAG calculations with quick, auditable outputs and supports batch checks across multiple color pairs. It emphasizes reproducibility by keeping input formats and calculation methods consistent.
Core features: input validation, WCAG-compliant ratio calculation, pass/fail guidance, exportable result data, and optional batch mode. Use cases include choosing body text colors for blue-on-white interfaces, ensuring high-contrast links, and validating contrast in dark mode palettes.