![]() As noted above, our goal at the University of Washington is to at least attain a Pass rating at Level AA, although a Pass rating at Level AAA is strongly encouraged. The tool then provides information on the contrast between these colors, including Pass or Fail ratings for various levels of WCAG compliance. You can do so by entering the hex values of color combinations or by using the eyedropper tool to grab foreground and background colors from anywhere on the screen. This makes it particularly useful for checking colors in various applications, including documents or software, not just websites. TPGI’s Colour Contrast Analyser is a downloadable application for both Windows and Mac that enables you to check the contrast of any two colors from your computer screen. The Deque Color Contrast Analyzer provides similar functionality to the WebAIM Contrast Checker, but in a slightly different interface and with a few additional features. This same feature is built into the WAVE Browser Extension, which is also developed by WebAIM and available for both Chrome and Firefox. In this color picker we use a simplified scoring method based on the Bronze level: 75: For normal body text. Scoring in APCA is dependent on the font and font-weight used. The negative value just means you're using a light-on-dark color combination. The higher the absolute score, the better the contrast. Conveniently, the site also includes a slider that can be used to gradually lighten or darken either of the colors until a “Pass” rating is attained. You can score between 0 and roughtly 106. The checker then calculates the contrast ratio and rates the colors with a “Pass” or “Fail” rating. The user can enter the hex value for each color, or they can select a color using the color picker widget (specific functionality varies by browser). The WebAIM Color Contrast Checker is a website that evaluates a pair of colors for WCAG compliance. A few tools that were specifically designed for testing contrast on web pages are described below. ![]() Several free tools have been developed that make it easy to check color combinations for WCAG compliance. For an overview of this issue, see Color contrast in our IT Accessibility Checklist.
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