#428CCC#428CCC

#428CCC is a light, vivid cyan. Relative luminance 0.243; OKLCH L 62.2% C 0.122 H 247.4°. Best body text is #000000 at 5.85:1 contrast (WCAG AA passes).

Color values

HEX	#428CCC
RGB	rgb(66, 140, 204)
HSL	hsl(208, 58%, 53%)
HSV	hsv(208, 68%, 80%)
CMYK	cmyk(67.6%, 31.4%, 0%, 20%)
CIE-LAB	lab(56.36, -2.50, -39.77)
CIE-LCH	lch(56.36, 39.85, 266.41°)
OKLab	oklab(62.19% -0.0469 -0.1125)
OKLCH	oklch(62.19% 0.122 247.4)
XYZ	xyz(22.5198, 24.2717, 60.6131)
Luminance	0.2427 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CCC #CC8242

analogous

#42CCC7 #428CCC #4247CC

triadic

#428CCC #CC428C #8CCC42

tetradic

#428CCC #C742CC #CC8242 #47CC42

square

#428CCC #C742CC #CC8242 #47CC42

split-complementary

#428CCC #CC4247 #CCC742

monochromatic

#1F4D74 #2C6DA4 #428CCC #72A9D9 #A2C7E6

Accessibility & contrast

On white

3.59

#428CCC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.85

#428CCC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CCC

5.85:1 — WCAG AA (normal text) passes

Contrast matrix

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

#708ECF

Deuteranopia (green-blind)

#5C81CB

Tritanopia (blue-blind)

#009BA3

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428ccc;
/* rgb */ color: rgb(66, 140, 204);
/* oklch */ color: oklch(62.2% 0.122 247.4);

Tailwind

colors: {
  custom: {
    50: '#85addc',
    500: '#428ccc',
    950: '#000000',
  },
}

SCSS

$custom: #428ccc;
$custom-light: #85addc;
$custom-dark: #000000;

JSON

{
  "hex": "#428ccc",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 204
  },
  "hsl": {
    "h": 207.826,
    "s": 57.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.62192,
    "c": 0.12189,
    "h": 247.4
  },
  "luminance": 0.24274
}

Semantic roles & 50–950 ramp

primary

#428CCC

secondary

#D3B397

accent

#8E47E1

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428CCC

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

Preview Lab → · Contrast checker → · Palette generator →