Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 4.5:1.The visual presentation of text and images of text has a contrast ratio of at least 7:1, except for the following: (Level AAA) 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: Guideline 1.4 Distinguishable: Make it easier for users to see and hear content including separating foreground from background. The Colour Contrast Analyser is useful to help determine the legibility of text on a web page or document, and the legibility of image based representations of text against WCAG 2.1В requirements. Learn more about colour contrast and colour accessibility in our Inclusive Design training course. The contrast ratio helps determine whether or not the contrast between two colours can be read by people with colour blindness or other visual impairments. It also contains functionality to create simulations of certain visual conditions such as colour blindness. It is primarily a tool for checking foreground & background colour combinations to determine if they provide good colour visibility. The tool was developed by JUn of the Web Accessibility Tools ConsortiumВ in collaboration with Vision Australia and Steve Faulkner of The Paciello GroupВ (Europe). The Colour Contrast Analyser is compatible with the Web Content Accessibility Guidelines version 2 (WCAG 2.1).

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