#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
RGBrgb(66, 142, 235)
HSLhsl(213, 81%, 59%)
HSVhsv(213, 72%, 92%)
CMYKcmyk(71.9%, 39.6%, 0%, 7.8%)
CIE-LABlab(58.51, 7.16, -53.71)
CIE-LCHlch(58.51, 54.18, 277.60°)
OKLaboklab(64.39% -0.0408 -0.1532)
OKLCHoklch(64.39% 0.159 255.1)
XYZxyz(26.9096, 26.4994, 82.2779)
Luminance0.2650 (WCAG relative)
Temperaturecool
Familycyan

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
##428EEB1.003.336.306.30
#FFFFFF3.331.0021.0021.00
#0000006.3021.001.001.00
##0000006.3021.001.001.00

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 →

#428EEB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva