Colour Contrast Application (Windows and Mac).Juicy Studio Accessibility Toolbar for Firefox.Juicy Studio Color Contrast Ratio Analyzer.The following links allow developers to test contrast between two Web color codes. Logotypes: Text that is part of a logo or brand name has no minimum contrast requirement.Incidental: Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1.The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: (Level AA) NOTE: If your target audience is mostly low vision, then a ratio of 1 to 7 is recommended. The WCAG 2.0 guildine 1.4.3 recommends the following luminosity ratio standard of 1 to 4.5 for main text and 1 to 3 for large-scale text (18 points+, or 14 points+ bold). Usually a low number or ratio indicates too little contrast. In most online tests, you enter in the hexadecimal color code for the foreground (text) and background colors, and the tester generates a numeric result. If you plan to use a subtle color palette, it is recommended that you use a color analyzer to ensure there is sufficient contrast. Examples include contrasting light grey versus middle grey, middle pastels versus darks, or white versus light cyan (blue-green). However, some modern designs are so "subtle" that the contrast can actually be insufficient for some readers. Other colors can be used-such as navy, dark green, or maroon for darks, and pastels for lights-to lessen the contrast. Maximum contrast is black versus white, but this combination can be considered too overwhelming (it might cause glare). An important aspect of color on the Web for both low vision and colorblind users is sufficient contrast between foreground (text or graphics) and the background.
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