#428EA3#428EA3

#428EA3 is a mid, moderate cyan. Relative luminance 0.231; OKLCH L 60.7% C 0.081 H 218.6°. Best body text is #000000 at 5.63:1 contrast (WCAG AA passes).

Color values

HEX	#428EA3
RGB	rgb(66, 142, 163)
HSL	hsl(193, 42%, 45%)
HSV	hsv(193, 60%, 64%)
CMYK	cmyk(59.5%, 12.9%, 0%, 36.1%)
CIE-LAB	lab(55.22, -17.08, -18.18)
CIE-LCH	lch(55.22, 24.95, 226.78°)
OKLab	oklab(60.72% -0.0633 -0.0505)
OKLCH	oklch(60.72% 0.081 218.6)
XYZ	xyz(18.5280, 23.1468, 38.1346)
Luminance	0.2315 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EA3 #A35742

analogous

#42A388 #428EA3 #425DA3

triadic

#428EA3 #A3428E #8EA342

tetradic

#428EA3 #8842A3 #A35742 #5DA342

square

#428EA3 #8842A3 #A35742 #5DA342

split-complementary

#428EA3 #A3425D #A38842

monochromatic

#1F424C #306877 #428EA3 #63ABC0 #8EC3D1

Accessibility & contrast

On white

3.73

#428EA3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.63

#428EA3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EA3

5.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EA3	#FFFFFF	#000000	##000000
##428EA3	1.00	3.73	5.63	5.63
#FFFFFF	3.73	1.00	21.00	21.00
#000000	5.63	21.00	1.00	1.00
##000000	5.63	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#818AA4

Deuteranopia (green-blind)

#7280A3

Tritanopia (blue-blind)

#009595

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428ea3;
/* rgb */ color: rgb(66, 142, 163);
/* oklch */ color: oklch(60.7% 0.081 218.6);

Tailwind

colors: {
  custom: {
    50: '#80afbe',
    500: '#428ea3',
    950: '#000000',
  },
}

SCSS

$custom: #428ea3;
$custom-light: #80afbe;
$custom-dark: #000000;

JSON

{
  "hex": "#428ea3",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 163
  },
  "hsl": {
    "h": 192.99,
    "s": 42.358,
    "l": 44.902
  },
  "oklch": {
    "l": 0.6072,
    "c": 0.08097,
    "h": 218.6
  },
  "luminance": 0.23149
}

Semantic roles & 50–950 ramp

primary

#428EA3

secondary

#BC9084

accent

#7156D2

background

#F8FAFB

surface

#EFF4F6

border

#CACED0

text

#0B1012

muted

#7C7F81

Preview Lab

Preview with #428EA3

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

Preview Lab → · Contrast checker → · Palette generator →