#428FD4#428FD4

#428FD4 is a light, vivid cyan. Relative luminance 0.256; OKLCH L 63.3% C 0.129 H 248.4°. Best body text is #000000 at 6.11:1 contrast (WCAG AA passes).

Color values

HEX	#428FD4
RGB	rgb(66, 143, 212)
HSL	hsl(208, 63%, 55%)
HSV	hsv(208, 69%, 83%)
CMYK	cmyk(68.9%, 32.5%, 0%, 16.9%)
CIE-LAB	lab(57.61, -1.49, -42.30)
CIE-LCH	lch(57.61, 42.32, 267.99°)
OKLab	oklab(63.3% -0.0475 -0.1199)
OKLCH	oklch(63.3% 0.129 248.4)
XYZ	xyz(23.9484, 25.5541, 65.9449)
Luminance	0.2556 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FD4 #D48742

analogous

#42D4D0 #428FD4 #4246D4

triadic

#428FD4 #D4428F #8FD442

tetradic

#428FD4 #D042D4 #D48742 #46D442

square

#428FD4 #D042D4 #D48742 #46D442

split-complementary

#428FD4 #D44246 #D4D042

monochromatic

#1D507F #2870B1 #428FD4 #74ADDF #A6CAEB

Accessibility & contrast

On white

3.44

#428FD4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.11

#428FD4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FD4

6.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FD4	#FFFFFF	#000000	##000000
##428FD4	1.00	3.44	6.11	6.11
#FFFFFF	3.44	1.00	21.00	21.00
#000000	6.11	21.00	1.00	1.00
##000000	6.11	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7092D7

Deuteranopia (green-blind)

#5C84D3

Tritanopia (blue-blind)

#009FA8

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428fd4;
/* rgb */ color: rgb(66, 143, 212);
/* oklch */ color: oklch(63.3% 0.129 248.4);

Tailwind

colors: {
  custom: {
    50: '#86afe1',
    500: '#428fd4',
    950: '#000000',
  },
}

SCSS

$custom: #428fd4;
$custom-light: #86afe1;
$custom-dark: #000000;

JSON

{
  "hex": "#428fd4",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 212
  },
  "hsl": {
    "h": 208.356,
    "s": 62.931,
    "l": 54.51
  },
  "oklch": {
    "l": 0.63304,
    "c": 0.12894,
    "h": 248.4
  },
  "luminance": 0.25557
}

Semantic roles & 50–950 ramp

primary

#428FD4

secondary

#D8B79A

accent

#8F42E6

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428FD4

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

Preview Lab → · Contrast checker → · Palette generator →