#428EEB#428EEB

#428EEB is a light, vivid cyan. Relative luminance 0.265; OKLCH L 64.4% C 0.159 H 255.1°. Best body text is #000000 at 6.30:1 contrast (WCAG AA passes).

Color values

HEX	#428EEB
RGB	rgb(66, 142, 235)
HSL	hsl(213, 81%, 59%)
HSV	hsv(213, 72%, 92%)
CMYK	cmyk(71.9%, 39.6%, 0%, 7.8%)
CIE-LAB	lab(58.51, 7.16, -53.71)
CIE-LCH	lch(58.51, 54.18, 277.60°)
OKLab	oklab(64.39% -0.0408 -0.1532)
OKLCH	oklch(64.39% 0.159 255.1)
XYZ	xyz(26.9096, 26.4994, 82.2779)
Luminance	0.2650 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EEB #EB9F42

analogous

#42E2EB #428EEB #4B42EB

triadic

#428EEB #EB428E #8EEB42

tetradic

#428EEB #EB42E2 #EB9F42 #42EB4B

square

#428EEB #EB42E2 #EB9F42 #42EB4B

split-complementary

#428EEB #EB4B42 #E2EB42

monochromatic

#1152A2 #176ED9 #428EEB #79AFF1 #B1D0F7

Accessibility & contrast

On white

3.33

#428EEB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.30

#428EEB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EEB

6.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EEB	#FFFFFF	#000000	##000000
##428EEB	1.00	3.33	6.30	6.30
#FFFFFF	3.33	1.00	21.00	21.00
#000000	6.30	21.00	1.00	1.00
##000000	6.30	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6295EF

Deuteranopia (green-blind)

#4786E9

Tritanopia (blue-blind)

#00A4B1

Achromatopsia (no color)

#8D8D8D

Design tokens & code

CSS

--color: #428eeb;
/* rgb */ color: rgb(66, 142, 235);
/* oklch */ color: oklch(64.4% 0.159 255.1);

Tailwind

colors: {
  custom: {
    50: '#8aaef2',
    500: '#428eeb',
    950: '#000000',
  },
}

SCSS

$custom: #428eeb;
$custom-light: #8aaef2;
$custom-dark: #000000;

JSON

{
  "hex": "#428eeb",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 235
  },
  "hsl": {
    "h": 213.018,
    "s": 80.861,
    "l": 59.02
  },
  "oklch": {
    "l": 0.64391,
    "c": 0.1586,
    "h": 255.1
  },
  "luminance": 0.26502
}

Semantic roles & 50–950 ramp

primary

#428EEB

secondary

#E6C8A3

accent

#9E31F7

background

#F9FAFE

surface

#F2F4FD

border

#CCCED5

text

#0D1017

muted

#7E7F85

Preview Lab

Preview with #428EEB

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

Preview Lab → · Contrast checker → · Palette generator →