#428BCD#428BCD

#428BCD is a light, vivid cyan. Relative luminance 0.240; OKLCH L 62.0% C 0.124 H 248.4°. Best body text is #000000 at 5.81:1 contrast (WCAG AA passes).

Color values

HEX	#428BCD
RGB	rgb(66, 139, 205)
HSL	hsl(208, 58%, 53%)
HSV	hsv(208, 68%, 80%)
CMYK	cmyk(67.8%, 32.2%, 0%, 19.6%)
CIE-LAB	lab(56.12, -1.57, -40.71)
CIE-LCH	lch(56.12, 40.74, 267.79°)
OKLab	oklab(62.02% -0.0456 -0.1153)
OKLCH	oklch(62.02% 0.124 248.4)
XYZ	xyz(22.4947, 24.0289, 61.1983)
Luminance	0.2403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BCD #CD8442

analogous

#42CDC9 #428BCD #4245CD

triadic

#428BCD #CD428B #8BCD42

tetradic

#428BCD #C942CD #CD8442 #45CD42

square

#428BCD #C942CD #CD8442 #45CD42

split-complementary

#428BCD #CD4245 #CDC942

monochromatic

#1F4C76 #2C6CA6 #428BCD #72A9DA #A3C6E7

Accessibility & contrast

On white

3.62

#428BCD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.81

#428BCD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BCD

5.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BCD	#FFFFFF	#000000	##000000
##428BCD	1.00	3.62	5.81	5.81
#FFFFFF	3.62	1.00	21.00	21.00
#000000	5.81	21.00	1.00	1.00
##000000	5.81	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6E8ED0

Deuteranopia (green-blind)

#5A81CC

Tritanopia (blue-blind)

#009BA3

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428bcd;
/* rgb */ color: rgb(66, 139, 205);
/* oklch */ color: oklch(62.0% 0.124 248.4);

Tailwind

colors: {
  custom: {
    50: '#85acdc',
    500: '#428bcd',
    950: '#000000',
  },
}

SCSS

$custom: #428bcd;
$custom-light: #85acdc;
$custom-dark: #000000;

JSON

{
  "hex": "#428bcd",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 205
  },
  "hsl": {
    "h": 208.489,
    "s": 58.159,
    "l": 53.137
  },
  "oklch": {
    "l": 0.62018,
    "c": 0.12396,
    "h": 248.4
  },
  "luminance": 0.24031
}

Semantic roles & 50–950 ramp

primary

#428BCD

secondary

#D3B497

accent

#9046E1

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BCD

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

Preview Lab → · Contrast checker → · Palette generator →