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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
#288FD5
RGB Values
40, 143, 213
HSL Values
204°, 68%, 50%
CMYK Values
81%, 33%, 0%, 16%

Color Variations & Tints

  • #69B2E2

    Lightness: 65%

  • #54A7DE

    Lightness: 60%

  • #3E9CDA

    Lightness: 55%

  • #288FD5

    Lightness: 50%

    Current color

  • #2582C1

    Lightness: 45%

  • #2174AB

    Lightness: 40%

  • #1D6596

    Lightness: 35%

Accessibility

White Text
3.5
FAIL
Black Text
6.0
PASS
WCAG AA
PASS
WCAG AAA
FAIL

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 #288FD5

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

Current: #288FD5

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