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Colorbook
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Color Information

Black

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

HEX Format
#428D7B
RGB Values
66, 141, 123
HSL Values
166°, 36%, 41%
CMYK Values
53%, 0%, 13%, 45%

Color Variations & Tints

  • #66B7A4

    Lightness: 56%

  • #55AF9A

    Lightness: 51%

  • #4BA08C

    Lightness: 46%

  • #428D7B

    Lightness: 41%

    Current color

  • #3B7D6D

    Lightness: 36%

  • #336C5E

    Lightness: 31%

  • #2A5A4F

    Lightness: 26%

Accessibility

White Text
3.9
FAIL
Black Text
5.3
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 #428D7B

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

Current: #428D7B

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