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Colorbook
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Color Information

Blue

Complete color analysis with professional format conversions, accessibility metrics, and harmonious color combinations for your design projects.

HEX Format
#183F80
RGB Values
24, 63, 128
HSL Values
218°, 68%, 30%
CMYK Values
81%, 51%, 0%, 50%

Color Variations & Tints

  • #255EC1

    Lightness: 45%

  • #2154AB

    Lightness: 40%

  • #1D4996

    Lightness: 35%

  • #183F80

    Lightness: 30%

    Current color

  • #14346B

    Lightness: 25%

  • #102A56

    Lightness: 20%

  • #0C1F40

    Lightness: 15%

Accessibility

White Text
10.2
PASS
Black Text
2.1
FAIL
WCAG AA
PASS
WCAG AAA
PASS

Accessibility Guide

Contrast Ratios
Higher values (4.5+) ensure better readability for users with visual impairments.
WCAG AA Standard
Minimum requirement: 4.5:1 contrast for normal text, 3:1 for large text.
WCAG AAA Standard
Enhanced level: 7:1 contrast for normal text, 4.5:1 for large text.

Color Harmonies

  • Complementary

    Colors opposite on the color wheel, creating high contrast

  • Triadic

    Three evenly spaced colors forming a triangle on the color wheel

  • Analogous

    Adjacent colors on the color wheel, creating harmony and unity

Be picky and fine tune your color: colors very near to #183F80

Systematic progression of extremely similar colors. Each color represents a precise step in lightness variation.

Current: #183F80

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