#428BBC#428BBC

#428BBC is a mid, moderate cyan. Relative luminance 0.233; OKLCH L 61.1% C 0.104 H 240.8°. Best body text is #000000 at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#428BBC
RGB	rgb(66, 139, 188)
HSL	hsl(204, 48%, 50%)
HSV	hsv(204, 65%, 74%)
CMYK	cmyk(64.9%, 26.1%, 0%, 26.3%)
CIE-LAB	lab(55.33, -7.35, -32.31)
CIE-LCH	lch(55.33, 33.13, 257.18°)
OKLab	oklab(61.14% -0.0508 -0.0909)
OKLCH	oklch(61.14% 0.104 240.8)
XYZ	xyz(20.5530, 23.2522, 50.9722)
Luminance	0.2325 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BBC #BC7342

analogous

#42BCB0 #428BBC #424EBC

triadic

#428BBC #BC428B #8BBC42

tetradic

#428BBC #B042BC #BC7342 #4EBC42

square

#428BBC #B042BC #BC7342 #4EBC42

split-complementary

#428BBC #BC424E #BCB042

monochromatic

#224861 #326A8F #428BBC #6FA7CC #9CC3DC

Accessibility & contrast

On white

3.72

#428BBC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.65

#428BBC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BBC

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BBC	#FFFFFF	#000000	##000000
##428BBC	1.00	3.72	5.65	5.65
#FFFFFF	3.72	1.00	21.00	21.00
#000000	5.65	21.00	1.00	1.00
##000000	5.65	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#758BBE

Deuteranopia (green-blind)

#647FBB

Tritanopia (blue-blind)

#00979C

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428bbc;
/* rgb */ color: rgb(66, 139, 188);
/* oklch */ color: oklch(61.1% 0.104 240.8);

Tailwind

colors: {
  custom: {
    50: '#83acd0',
    500: '#428bbc',
    950: '#000000',
  },
}

SCSS

$custom: #428bbc;
$custom-light: #83acd0;
$custom-dark: #000000;

JSON

{
  "hex": "#428bbc",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 188
  },
  "hsl": {
    "h": 204.098,
    "s": 48.031,
    "l": 49.804
  },
  "oklch": {
    "l": 0.6114,
    "c": 0.10413,
    "h": 240.8
  },
  "luminance": 0.23254
}

Semantic roles & 50–950 ramp

primary

#428BBC

secondary

#C9A791

accent

#8750D8

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428BBC

Body copy rendered with the generated semantic roles for this colour.

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