#428BD4#428BD4

#428BD4 is a light, vivid cyan. Relative luminance 0.244; OKLCH L 62.4% C 0.133 H 250.8°. Best body text is #000000 at 5.88:1 contrast (WCAG AA passes).

Color values

HEX	#428BD4
RGB	rgb(66, 139, 212)
HSL	hsl(210, 63%, 55%)
HSV	hsv(210, 69%, 83%)
CMYK	cmyk(68.9%, 34.4%, 0%, 16.9%)
CIE-LAB	lab(56.46, 0.86, -44.11)
CIE-LCH	lch(56.46, 44.12, 271.11°)
OKLab	oklab(62.4% -0.0436 -0.1252)
OKLCH	oklch(62.4% 0.133 250.8)
XYZ	xyz(23.3586, 24.3745, 65.7483)
Luminance	0.2438 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BD4 #D48B42

analogous

#42D4D4 #428BD4 #4242D4

triadic

#428BD4 #D4428B #8BD442

tetradic

#428BD4 #D442D4 #D48B42 #42D442

square

#428BD4 #D442D4 #D48B42 #42D442

split-complementary

#428BD4 #D44242 #D4D442

monochromatic

#1D4E7F #286CB1 #428BD4 #74AADF #A6C8EB

Accessibility & contrast

On white

3.57

#428BD4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.88

#428BD4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BD4

5.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BD4	#FFFFFF	#000000	##000000
##428BD4	1.00	3.57	5.88	5.88
#FFFFFF	3.57	1.00	21.00	21.00
#000000	5.88	21.00	1.00	1.00
##000000	5.88	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6A8FD7

Deuteranopia (green-blind)

#5681D3

Tritanopia (blue-blind)

#009CA6

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428bd4;
/* rgb */ color: rgb(66, 139, 212);
/* oklch */ color: oklch(62.4% 0.133 250.8);

Tailwind

colors: {
  custom: {
    50: '#86ace1',
    500: '#428bd4',
    950: '#000000',
  },
}

SCSS

$custom: #428bd4;
$custom-light: #86ace1;
$custom-dark: #000000;

JSON

{
  "hex": "#428bd4",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 212
  },
  "hsl": {
    "h": 210,
    "s": 62.931,
    "l": 54.51
  },
  "oklch": {
    "l": 0.62401,
    "c": 0.13259,
    "h": 250.8
  },
  "luminance": 0.24377
}

Semantic roles & 50–950 ramp

primary

#428BD4

secondary

#D8B99A

accent

#9442E6

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BD4

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

Preview Lab → · Contrast checker → · Palette generator →