A WebAIM tool for checking foreground and background color contrast in RGB hexadecimal format or with a color picker. It reports a contrast ratio and WCAG AA and AAA pass/fail states for normal text, large text, graphical objects and user interface components. It also functions as a basic API when &api is appended to a permalink.
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webaim.org
colourcontrast.cc
Colour Contrast Checker is a web tool that checks the contrast between different colour combinations against WCAG standards. It displays pass results for normal and large text and provides background and foreground colour values with copy options.
realtimecolors.com
Realtime Colors is a web tool for visualizing color palettes and fonts on a real website. It stores the selected colors, includes a contrast checker, and allows exporting in formats such as .zip, .png, CSS and SCSS. The source also lists a Figma plugin and VS Code.