#428CCB#428CCB

#428CCB is a light, vivid cyan. Relative luminance 0.242; OKLCH L 62.1% C 0.121 H 247.0°. Best body text is #000000 at 5.85:1 contrast (WCAG AA passes).

Color values

HEX	#428CCB
RGB	rgb(66, 140, 203)
HSL	hsl(208, 57%, 53%)
HSV	hsv(208, 67%, 80%)
CMYK	cmyk(67.5%, 31%, 0%, 20.4%)
CIE-LAB	lab(56.31, -2.84, -39.28)
CIE-LCH	lch(56.31, 39.38, 265.86°)
OKLab	oklab(62.14% -0.0471 -0.1111)
OKLCH	oklch(62.14% 0.121 247)
XYZ	xyz(22.4003, 24.2239, 59.9835)
Luminance	0.2423 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CCB #CB8142

analogous

#42CBC5 #428CCB #4248CB

triadic

#428CCB #CB428C #8CCB42

tetradic

#428CCB #C542CB #CB8142 #48CB42

square

#428CCB #C542CB #CB8142 #48CB42

split-complementary

#428CCB #CB4248 #CBC542

monochromatic

#204D73 #2D6DA3 #428CCB #72A9D8 #A2C6E5

Accessibility & contrast

On white

3.59

#428CCB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.85

#428CCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CCB

5.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CCB	#FFFFFF	#000000	##000000
##428CCB	1.00	3.59	5.85	5.85
#FFFFFF	3.59	1.00	21.00	21.00
#000000	5.85	21.00	1.00	1.00
##000000	5.85	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#708ECE

Deuteranopia (green-blind)

#5D81CA

Tritanopia (blue-blind)

#009BA2

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428ccb;
/* rgb */ color: rgb(66, 140, 203);
/* oklch */ color: oklch(62.1% 0.121 247.0);

Tailwind

colors: {
  custom: {
    50: '#85addb',
    500: '#428ccb',
    950: '#000000',
  },
}

SCSS

$custom: #428ccb;
$custom-light: #85addb;
$custom-dark: #000000;

JSON

{
  "hex": "#428ccb",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 203
  },
  "hsl": {
    "h": 207.591,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.62139,
    "c": 0.12068,
    "h": 247
  },
  "luminance": 0.24226
}

Semantic roles & 50–950 ramp

primary

#428CCB

secondary

#D2B297

accent

#8E48E0

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428CCB

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

Preview Lab → · Contrast checker → · Palette generator →