#428BD8#428BD8

#428BD8 is a light, vivid cyan. Relative luminance 0.246; OKLCH L 62.6% C 0.138 H 252.0°. Best body text is #000000 at 5.92:1 contrast (WCAG AA passes).

Color values

HEX	#428BD8
RGB	rgb(66, 139, 216)
HSL	hsl(211, 66%, 55%)
HSV	hsv(211, 69%, 85%)
CMYK	cmyk(69.4%, 35.6%, 0%, 15.3%)
CIE-LAB	lab(56.66, 2.25, -46.04)
CIE-LCH	lch(56.66, 46.10, 272.80°)
OKLab	oklab(62.63% -0.0426 -0.1308)
OKLCH	oklch(62.63% 0.138 252)
XYZ	xyz(23.8695, 24.5788, 68.4387)
Luminance	0.2458 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BD8 #D88F42

analogous

#42D6D8 #428BD8 #4442D8

triadic

#428BD8 #D8428B #8BD842

tetradic

#428BD8 #D842D6 #D88F42 #42D844

square

#428BD8 #D842D6 #D88F42 #42D844

split-complementary

#428BD8 #D84442 #D6D842

monochromatic

#1B4E84 #266CB7 #428BD8 #75AAE2 #A7C9ED

Accessibility & contrast

On white

3.55

#428BD8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.92

#428BD8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BD8

5.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BD8	#FFFFFF	#000000	##000000
##428BD8	1.00	3.55	5.92	5.92
#FFFFFF	3.55	1.00	21.00	21.00
#000000	5.92	21.00	1.00	1.00
##000000	5.92	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6890DB

Deuteranopia (green-blind)

#5382D6

Tritanopia (blue-blind)

#009DA7

Achromatopsia (no color)

#888888

Design tokens & code

CSS

--color: #428bd8;
/* rgb */ color: rgb(66, 139, 216);
/* oklch */ color: oklch(62.6% 0.138 252.0);

Tailwind

colors: {
  custom: {
    50: '#87ace4',
    500: '#428bd8',
    950: '#000000',
  },
}

SCSS

$custom: #428bd8;
$custom-light: #87ace4;
$custom-dark: #000000;

JSON

{
  "hex": "#428bd8",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 216
  },
  "hsl": {
    "h": 210.8,
    "s": 65.789,
    "l": 55.294
  },
  "oklch": {
    "l": 0.62625,
    "c": 0.1376,
    "h": 252
  },
  "luminance": 0.24581
}

Semantic roles & 50–950 ramp

primary

#428BD8

secondary

#DABC9C

accent

#963FE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1015

muted

#7D7F84

Preview Lab

Preview with #428BD8

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

Preview Lab → · Contrast checker → · Palette generator →