#428CB5#428CB5

#428CB5 is a mid, moderate cyan. Relative luminance 0.233; OKLCH L 61.0% C 0.096 H 235.6°. Best body text is #000000 at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#428CB5
RGB	rgb(66, 140, 181)
HSL	hsl(201, 47%, 48%)
HSV	hsv(201, 64%, 71%)
CMYK	cmyk(63.5%, 22.7%, 0%, 29%)
CIE-LAB	lab(55.33, -10.24, -28.32)
CIE-LCH	lch(55.33, 30.12, 250.13°)
OKLab	oklab(61.04% -0.0543 -0.0794)
OKLCH	oklch(61.04% 0.096 235.6)
XYZ	xyz(19.9621, 23.2486, 47.1425)
Luminance	0.2325 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CB5 #B56B42

analogous

#42B5A4 #428CB5 #4252B5

triadic

#428CB5 #B5428C #8CB542

tetradic

#428CB5 #A442B5 #B56B42 #52B542

square

#428CB5 #A442B5 #B56B42 #52B542

split-complementary

#428CB5 #B54252 #B5A442

monochromatic

#21475B #326988 #428CB5 #6BA8C9 #98C2D9

Accessibility & contrast

On white

3.72

#428CB5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.65

#428CB5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CB5

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CB5	#FFFFFF	#000000	##000000
##428CB5	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)

#798BB7

Deuteranopia (green-blind)

#697FB4

Tritanopia (blue-blind)

#00979A

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428cb5;
/* rgb */ color: rgb(66, 140, 181);
/* oklch */ color: oklch(61.0% 0.096 235.6);

Tailwind

colors: {
  custom: {
    50: '#82adcb',
    500: '#428cb5',
    950: '#000000',
  },
}

SCSS

$custom: #428cb5;
$custom-light: #82adcb;
$custom-dark: #000000;

JSON

{
  "hex": "#428cb5",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 181
  },
  "hsl": {
    "h": 201.391,
    "s": 46.559,
    "l": 48.431
  },
  "oklch": {
    "l": 0.61037,
    "c": 0.09618,
    "h": 235.6
  },
  "luminance": 0.23251
}

Semantic roles & 50–950 ramp

primary

#428CB5

secondary

#C5A18E

accent

#8152D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428CB5

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

Preview Lab → · Contrast checker → · Palette generator →