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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
#378BFD
RGB Values
55, 139, 253
HSL Values
215°, 98%, 60%
CMYK Values
78%, 45%, 0%, 1%

Color Variations & Tints

  • #81B5FE

    Lightness: 75%

  • #68A6FD

    Lightness: 70%

  • #4E97FD

    Lightness: 65%

  • #378BFD

    Lightness: 60%

    Current color

  • #1C7AFD

    Lightness: 55%

  • #036BFC

    Lightness: 50%

  • #0260E3

    Lightness: 45%

Accessibility

White Text
3.3
FAIL
Black Text
6.3
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 #378BFD

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

Current: #378BFD

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