#428BC9#428BC9

#428BC9 is a mid, moderate cyan. Relative luminance 0.238; OKLCH L 61.8% C 0.119 H 246.9°. Best body text is #000000 at 5.77:1 contrast (WCAG AA passes).

Color values

HEX	#428BC9
RGB	rgb(66, 139, 201)
HSL	hsl(208, 56%, 52%)
HSV	hsv(208, 67%, 79%)
CMYK	cmyk(67.2%, 30.8%, 0%, 21.2%)
CIE-LAB	lab(55.93, -2.94, -38.76)
CIE-LCH	lch(55.93, 38.87, 265.65°)
OKLab	oklab(61.8% -0.0467 -0.1096)
OKLCH	oklch(61.8% 0.119 246.9)
XYZ	xyz(22.0180, 23.8382, 58.6879)
Luminance	0.2384 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BC9 #C98042

analogous

#42C9C4 #428BC9 #4247C9

triadic

#428BC9 #C9428B #8BC942

tetradic

#428BC9 #C442C9 #C98042 #47C942

square

#428BC9 #C442C9 #C98042 #47C942

split-complementary

#428BC9 #C94247 #C9C442

monochromatic

#204C70 #2E6CA0 #428BC9 #72A8D7 #A1C5E4

Accessibility & contrast

On white

3.64

#428BC9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.77

#428BC9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BC9

5.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BC9	#FFFFFF	#000000	##000000
##428BC9	1.00	3.64	5.77	5.77
#FFFFFF	3.64	1.00	21.00	21.00
#000000	5.77	21.00	1.00	1.00
##000000	5.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6F8DCC

Deuteranopia (green-blind)

#5D80C8

Tritanopia (blue-blind)

#009AA1

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428bc9;
/* rgb */ color: rgb(66, 139, 201);
/* oklch */ color: oklch(61.8% 0.119 246.9);

Tailwind

colors: {
  custom: {
    50: '#85acd9',
    500: '#428bc9',
    950: '#000000',
  },
}

SCSS

$custom: #428bc9;
$custom-light: #85acd9;
$custom-dark: #000000;

JSON

{
  "hex": "#428bc9",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 201
  },
  "hsl": {
    "h": 207.556,
    "s": 55.556,
    "l": 52.353
  },
  "oklch": {
    "l": 0.61804,
    "c": 0.11913,
    "h": 246.9
  },
  "luminance": 0.23841
}

Semantic roles & 50–950 ramp

primary

#428BC9

secondary

#D1B196

accent

#8E49DF

background

#F8FAFD

surface

#F0F4FA

border

#CBCED3

text

#0C1014

muted

#7D7F83

Preview Lab

Preview with #428BC9

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

Preview Lab → · Contrast checker → · Palette generator →