#428ACC#428ACC

#428ACC is a mid, vivid cyan. Relative luminance 0.237; OKLCH L 61.7% C 0.124 H 248.7°. Best body text is #000000 at 5.74:1 contrast (WCAG AA passes).

Color values

HEX	#428ACC
RGB	rgb(66, 138, 204)
HSL	hsl(209, 58%, 53%)
HSV	hsv(209, 68%, 80%)
CMYK	cmyk(67.6%, 32.4%, 0%, 20%)
CIE-LAB	lab(55.78, -1.33, -40.68)
CIE-LCH	lch(55.78, 40.70, 268.13°)
OKLab	oklab(61.74% -0.0449 -0.1152)
OKLCH	oklch(61.74% 0.124 248.7)
XYZ	xyz(22.2303, 23.6925, 60.5166)
Luminance	0.2369 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428ACC #CC8442

analogous

#42CCC9 #428ACC #4245CC

triadic

#428ACC #CC428A #8ACC42

tetradic

#428ACC #C942CC #CC8442 #45CC42

square

#428ACC #C942CC #CC8442 #45CC42

split-complementary

#428ACC #CC4245 #CCC942

monochromatic

#1F4C74 #2C6BA4 #428ACC #72A8D9 #A2C6E6

Accessibility & contrast

On white

3.66

#428ACC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.74

#428ACC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428ACC

5.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428ACC	#FFFFFF	#000000	##000000
##428ACC	1.00	3.66	5.74	5.74
#FFFFFF	3.66	1.00	21.00	21.00
#000000	5.74	21.00	1.00	1.00
##000000	5.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6D8DCF

Deuteranopia (green-blind)

#5A80CB

Tritanopia (blue-blind)

#009AA2

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428acc;
/* rgb */ color: rgb(66, 138, 204);
/* oklch */ color: oklch(61.7% 0.124 248.7);

Tailwind

colors: {
  custom: {
    50: '#85abdc',
    500: '#428acc',
    950: '#000000',
  },
}

SCSS

$custom: #428acc;
$custom-light: #85abdc;
$custom-dark: #000000;

JSON

{
  "hex": "#428acc",
  "rgb": {
    "r": 66,
    "g": 138,
    "b": 204
  },
  "hsl": {
    "h": 208.696,
    "s": 57.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.61736,
    "c": 0.12363,
    "h": 248.7
  },
  "luminance": 0.23695
}

Semantic roles & 50–950 ramp

primary

#428ACC

secondary

#D3B497

accent

#9147E1

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428ACC

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

Preview Lab → · Contrast checker → · Palette generator →