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CT

Colour Tools

Check contrast ratios, convert between colour formats, and explore colour properties

Color Preview

rgb(51, 87, 255)

Contrast Ratio

Text on White

Ratio: 5.32 AA

Text on Black

Ratio: 3.95 AA Large

Why contrast matters: Sufficient contrast between text and background colors ensures content is readable by users with low vision or color vision deficiencies.

For most text, aim for at least AA (4.5+) compliance. For large headings, AA Large (3.0+) may be acceptable.

Contrast Ratio Legend:

Fail (<3.0)
AA Large (3.0+)
AA (4.5+)
AAA (7.0+)

Color Conversions

HEX

#3357ff

RGB

rgb(51, 87, 255)

RGBA

rgba(51, 87, 255, 1.00)

HSL

hsl(229, 100%, 60%)

HSLA

hsla(229, 100%, 60%, 1.00)

CMYK

cmyk(80%, 66%, 0%, 0%)

HWB

hwb(229, 20%, 0%)

LAB

lab(45, 47, -86)

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