Contrast UX Checker

This tool computes the contrast ratio between a foreground and background color to assess readability under WCAG guidelines. It supports common color formats and provides both normal and large-text pass/fail results, enabling quick design decisions. Conceptually, the tool converts colors to linear luminance, applies the standard WCAG formula, and compares against thresholds. It also accepts optional typography inputs to refine thresholds, reflecting how font size and weight influence accessibility judgments. The output guides designers toward compliant color pairs and typographic choices, streamlining accessibility reviews. By encapsulating the calculation in a simple, repeatable process, teams can document why a color pair passes or fails and iterate efficiently. The value lies in early, data-driven decisions for color systems, palettes, and type scales, reducing the need for ad hoc judgments. Use cases include color palette audits, UI theming, and content styling for dashboards, apps, and marketing sites. Unique differentiators include: support for multiple input formats, explicit large-text thresholds, and clear, actionable feedback on how to adjust colors or typography to meet AA/AAA targets. Core features cover calculation, compliance checks, and suggested tweaks, with outputs designed to feed design systems and automated QA. This tool benefits accessibility engineers, product designers, and frontend teams seeking reliable, repeatable contrast validation throughout the development lifecycle.