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How to use

As you type, the contrast ratio indicated will update. Hover over the circle to get more detailed information. When semi-transparent colors are involved as backgrounds, the contrast ratio will have an error margin, to account for the different colors they may be over.

This sample text attempts to visually demonstrate how readable this color combination is, for normal, italic, bold, or bold italic text of various sizes and font styles.

It's critical for content readability and web performance that your website's ratio be in the green zone.

Contrast Ratio was created by Lea Verou.

Hint: Press the up and down keyboard arrows while over a number inside a functional color notation. Watch it increment/decrement. Try with the Shift or Alt key too!

WCAG 2.1 on contrast ratio

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