The Contrast Checker estimates the visual contrast between a text color and a background color, helping you design more readable and accessible interfaces. Good contrast is essential for users with visual impairments and for anyone viewing content on bright screens or in challenging lighting conditions. Accessibility guidelines such as WCAG provide recommended contrast ratios for normal and large text.

With this tool you choose a foreground color and a background color. The checker calculates a contrast ratio and reports whether it meets common accessibility thresholds for normal and large text. This can guide your decisions when choosing button labels, body text, links, and muted secondary text. By testing color pairs before shipping a design, you reduce the risk of hard-to-read content.

All calculations are handled locally in your browser using standard formulas. The interface includes a preview area so you can see how a simple text sample might look using your chosen colors. It is a valuable utility for designers, developers, and content teams who want to build more inclusive and comfortable reading experiences.