#428CBB#428CBB

#428CBB is a mid, moderate cyan. Relative luminance 0.235; OKLCH L 61.3% C 0.102 H 239.4°. Best body text is #000000 at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#428CBB
RGB	rgb(66, 140, 187)
HSL	hsl(203, 48%, 50%)
HSV	hsv(203, 65%, 73%)
CMYK	cmyk(64.7%, 25.1%, 0%, 26.7%)
CIE-LAB	lab(55.58, -8.25, -31.35)
CIE-LCH	lch(55.58, 32.41, 255.25°)
OKLab	oklab(61.33% -0.0522 -0.0881)
OKLCH	oklch(61.33% 0.102 239.4)
XYZ	xyz(20.5911, 23.5002, 50.4549)
Luminance	0.2350 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CBB #BB7142

analogous

#42BBAE #428CBB #424FBB

triadic

#428CBB #BB428C #8CBB42

tetradic

#428CBB #AE42BB #BB7142 #4FBB42

square

#428CBB #AE42BB #BB7142 #4FBB42

split-complementary

#428CBB #BB424F #BBAE42

monochromatic

#224861 #326A8E #428CBB #6EA8CC #9CC3DC

Accessibility & contrast

On white

3.68

#428CBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.70

#428CBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CBB

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CBB	#FFFFFF	#000000	##000000
##428CBB	1.00	3.68	5.70	5.70
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.70	21.00	1.00	1.00
##000000	5.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#768CBD

Deuteranopia (green-blind)

#6680BA

Tritanopia (blue-blind)

#00989C

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428cbb;
/* rgb */ color: rgb(66, 140, 187);
/* oklch */ color: oklch(61.3% 0.102 239.4);

Tailwind

colors: {
  custom: {
    50: '#82adcf',
    500: '#428cbb',
    950: '#000000',
  },
}

SCSS

$custom: #428cbb;
$custom-light: #82adcf;
$custom-dark: #000000;

JSON

{
  "hex": "#428cbb",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 187
  },
  "hsl": {
    "h": 203.306,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.61325,
    "c": 0.1024,
    "h": 239.4
  },
  "luminance": 0.23502
}

Semantic roles & 50–950 ramp

primary

#428CBB

secondary

#C8A691

accent

#8550D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428CBB

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

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