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RGBHex

blue

#0000FF

blueCSS named color.

Formats

Open #0000FF in the converter →

Contrast & legibility

Text on white8.18:1 AA ✓
Text on black2.57:1 AA ✗

WCAG 2.2 AA requires 4.5:1 for normal text and 3:1 for large text. Check any pair →

Tints & shades

An 11-stop OKLCH ramp through blue (the same engine as the theme builder). Click any stop to open its page.

Harmonies

Explore all harmonies for #0000FF

Color-blindness preview

#0059ff

Protanopia

#003dfb

Deuteranopia

#006b96

Tritanopia

#4c4c4c

Achromatopsia

How blue appears to viewers with each color-vision deficiency. Full simulator →

About blue

#0000FF is blue, a css named color. This page shows its rgb(0, 49, 229) / hsl(227.28, 100%, 44.96%) / oklch(0.452 0.3132 264.05) values, WCAG contrast against black and white, an OKLCH tint-and-shade ramp, and complementary, analogous, and triadic harmonies — all computed in perceptually-uniform OKLCH.