#428ACB#428ACB

#428ACB is a mid, vivid cyan. Relative luminance 0.236; OKLCH L 61.7% C 0.122 H 248.4°. Best body text is #000000 at 5.73:1 contrast (WCAG AA passes).

Color values

HEX	#428ACB
RGB	rgb(66, 138, 203)
HSL	hsl(208, 57%, 53%)
HSV	hsv(208, 67%, 80%)
CMYK	cmyk(67.5%, 32%, 0%, 20.4%)
CIE-LAB	lab(55.73, -1.67, -40.19)
CIE-LCH	lch(55.73, 40.23, 267.62°)
OKLab	oklab(61.68% -0.0451 -0.1138)
OKLCH	oklch(61.68% 0.122 248.4)
XYZ	xyz(22.1107, 23.6447, 59.8870)
Luminance	0.2365 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428ACB #CB8342

analogous

#42CBC7 #428ACB #4246CB

triadic

#428ACB #CB428A #8ACB42

tetradic

#428ACB #C742CB #CB8342 #46CB42

square

#428ACB #C742CB #CB8342 #46CB42

split-complementary

#428ACB #CB4246 #CBC742

monochromatic

#204B73 #2D6BA3 #428ACB #72A8D8 #A2C5E5

Accessibility & contrast

On white

3.67

#428ACB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.73

#428ACB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428ACB

5.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428ACB	#FFFFFF	#000000	##000000
##428ACB	1.00	3.67	5.73	5.73
#FFFFFF	3.67	1.00	21.00	21.00
#000000	5.73	21.00	1.00	1.00
##000000	5.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6D8DCE

Deuteranopia (green-blind)

#5A80CA

Tritanopia (blue-blind)

#0099A1

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428acb;
/* rgb */ color: rgb(66, 138, 203);
/* oklch */ color: oklch(61.7% 0.122 248.4);

Tailwind

colors: {
  custom: {
    50: '#85abdb',
    500: '#428acb',
    950: '#000000',
  },
}

SCSS

$custom: #428acb;
$custom-light: #85abdb;
$custom-dark: #000000;

JSON

{
  "hex": "#428acb",
  "rgb": {
    "r": 66,
    "g": 138,
    "b": 203
  },
  "hsl": {
    "h": 208.467,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.61682,
    "c": 0.12241,
    "h": 248.4
  },
  "luminance": 0.23647
}

Semantic roles & 50–950 ramp

primary

#428ACB

secondary

#D2B397

accent

#9048E0

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428ACB

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

Preview Lab → · Contrast checker → · Palette generator →