#428EA4#428EA4

#428EA4 is a mid, moderate cyan. Relative luminance 0.232; OKLCH L 60.8% C 0.082 H 219.5°. Best body text is #000000 at 5.64:1 contrast (WCAG AA passes).

Color values

HEX	#428EA4
RGB	rgb(66, 142, 164)
HSL	hsl(193, 43%, 45%)
HSV	hsv(193, 60%, 64%)
CMYK	cmyk(59.8%, 13.4%, 0%, 35.7%)
CIE-LAB	lab(55.26, -16.78, -18.70)
CIE-LCH	lch(55.26, 25.12, 228.10°)
OKLab	oklab(60.76% -0.0629 -0.0519)
OKLCH	oklch(60.76% 0.082 219.5)
XYZ	xyz(18.6179, 23.1828, 38.6083)
Luminance	0.2319 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EA4 #A45842

analogous

#42A489 #428EA4 #425DA4

triadic

#428EA4 #A4428E #8EA442

tetradic

#428EA4 #8942A4 #A45842 #5DA442

square

#428EA4 #8942A4 #A45842 #5DA442

split-complementary

#428EA4 #A4425D #A48942

monochromatic

#1F424D #306878 #428EA4 #63ABC0 #8FC3D2

Accessibility & contrast

On white

3.73

#428EA4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.64

#428EA4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EA4

5.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EA4	#FFFFFF	#000000	##000000
##428EA4	1.00	3.73	5.64	5.64
#FFFFFF	3.73	1.00	21.00	21.00
#000000	5.64	21.00	1.00	1.00
##000000	5.64	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#808AA5

Deuteranopia (green-blind)

#7280A4

Tritanopia (blue-blind)

#009595

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428ea4;
/* rgb */ color: rgb(66, 142, 164);
/* oklch */ color: oklch(60.8% 0.082 219.5);

Tailwind

colors: {
  custom: {
    50: '#80afbf',
    500: '#428ea4',
    950: '#000000',
  },
}

SCSS

$custom: #428ea4;
$custom-light: #80afbf;
$custom-dark: #000000;

JSON

{
  "hex": "#428ea4",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 164
  },
  "hsl": {
    "h": 193.469,
    "s": 42.609,
    "l": 45.098
  },
  "oklch": {
    "l": 0.60762,
    "c": 0.08158,
    "h": 219.5
  },
  "luminance": 0.23185
}

Semantic roles & 50–950 ramp

primary

#428EA4

secondary

#BD9185

accent

#7155D2

background

#F8FAFB

surface

#EFF4F7

border

#CACED0

text

#0B1012

muted

#7C7F81

Preview Lab

Preview with #428EA4

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

Preview Lab → · Contrast checker → · Palette generator →