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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
#428ADB
RGB Values
66, 138, 219
HSL Values
212°, 68%, 56%
CMYK Values
70%, 37%, 0%, 14%

Color Variations & Tints

  • #83B2E7

    Lightness: 71%

  • #6DA4E3

    Lightness: 66%

  • #5897DF

    Lightness: 61%

  • #428ADB

    Lightness: 56%

    Current color

  • #2D7CD7

    Lightness: 51%

  • #2670C5

    Lightness: 46%

  • #2164B0

    Lightness: 41%

Accessibility

White Text
3.6
FAIL
Black Text
5.9
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 #428ADB

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

Current: #428ADB

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