Colour Contrast Checker: Check Text and Background Contrast
A free tool for checking text and background contrast, with WCAG AA and AAA indicators, HEX, RGB and HSL controls, and typography previews.
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UI/UX 2
WhoCanUse: color contrast and vision simulations
A free browser tool for checking text and background contrast, with WCAG grades and previews of different vision conditions and screen-viewing situations.