The Color Accessibility Tester Tool helps designers, developers, and accessibility specialists evaluate whether text and background color combinations meet WCAG contrast ratio guidelines. Start by choosing your foreground color (text) and background color using the color picker or by entering a HEX code. For quick testing, use preset options like Black on White, White on Black, Blue on White, or Yellow on Black. The tool instantly calculates the contrast ratio, luminance difference, and color brightness levels for your selected combination.

Next, explore the testing options to refine your results. Adjust font size, font weight, and test text to simulate real-world scenarios. Enable large text preview, graphics preview, or color-blind simulation to see how your design looks for users with different visual abilities. The live preview panel demonstrates how your chosen colors appear in buttons, links, cards, and input fields, making it easier to identify accessibility issues early in the design process.

Finally, check the WCAG compliance results, which show whether your color choices pass AA or AAA standards for normal text, large text, and graphics. Use the detailed analysis to review luminance ratios, brightness differences, and accessibility scores. If your combination fails, swap or randomize colors until you find one that meets the requirements. With this tool, you can create accessible, user-friendly, and inclusive interfaces that improve readability and meet global accessibility standards.