#428BCC#428BCC

#428BCC is a mid, vivid cyan. Relative luminance 0.240; OKLCH L 62.0% C 0.123 H 248.1°. Best body text is #000000 at 5.80:1 contrast (WCAG AA passes).

Color values

HEX	#428BCC
RGB	rgb(66, 139, 204)
HSL	hsl(208, 58%, 53%)
HSV	hsv(208, 68%, 80%)
CMYK	cmyk(67.6%, 31.9%, 0%, 20%)
CIE-LAB	lab(56.07, -1.91, -40.23)
CIE-LCH	lch(56.07, 40.27, 267.28°)
OKLab	oklab(61.96% -0.0459 -0.1139)
OKLCH	oklch(61.96% 0.123 248.1)
XYZ	xyz(22.3744, 23.9808, 60.5646)
Luminance	0.2398 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BCC #CC8342

analogous

#42CCC8 #428BCC #4246CC

triadic

#428BCC #CC428B #8BCC42

tetradic

#428BCC #C842CC #CC8342 #46CC42

square

#428BCC #C842CC #CC8342 #46CC42

split-complementary

#428BCC #CC4246 #CCC842

monochromatic

#1F4C74 #2C6CA4 #428BCC #72A9D9 #A2C6E6

Accessibility & contrast

On white

3.62

#428BCC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.80

#428BCC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BCC

5.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BCC	#FFFFFF	#000000	##000000
##428BCC	1.00	3.62	5.80	5.80
#FFFFFF	3.62	1.00	21.00	21.00
#000000	5.80	21.00	1.00	1.00
##000000	5.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6E8ECF

Deuteranopia (green-blind)

#5B80CB

Tritanopia (blue-blind)

#009AA2

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428bcc;
/* rgb */ color: rgb(66, 139, 204);
/* oklch */ color: oklch(62.0% 0.123 248.1);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#428bcc",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 204
  },
  "hsl": {
    "h": 208.261,
    "s": 57.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.61964,
    "c": 0.12275,
    "h": 248.1
  },
  "luminance": 0.23983
}

Semantic roles & 50–950 ramp

primary

#428BCC

secondary

#D3B397

accent

#8F47E1

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BCC

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

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