#428EE0#428EE0

#428EE0 is a light, vivid cyan. Relative luminance 0.259; OKLCH L 63.7% C 0.145 H 252.5°. Best body text is #000000 at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#428EE0
RGB	rgb(66, 142, 224)
HSL	hsl(211, 72%, 57%)
HSV	hsv(211, 71%, 88%)
CMYK	cmyk(70.5%, 36.6%, 0%, 12.2%)
CIE-LAB	lab(57.93, 3.28, -48.51)
CIE-LCH	lch(57.93, 48.62, 273.87°)
OKLab	oklab(63.75% -0.0434 -0.138)
OKLCH	oklch(63.75% 0.145 252.5)
XYZ	xyz(25.3693, 25.8833, 74.1655)
Luminance	0.2589 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EE0 #E09442

analogous

#42DDE0 #428EE0 #4542E0

triadic

#428EE0 #E0428E #8EE042

tetradic

#428EE0 #E042DD #E09442 #42E045

square

#428EE0 #E042DD #E09442 #42E045

split-complementary

#428EE0 #E04542 #DDE042

monochromatic

#185290 #206FC5 #428EE0 #77ADE9 #ABCDF1

Accessibility & contrast

On white

3.40

#428EE0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.18

#428EE0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EE0

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EE0	#FFFFFF	#000000	##000000
##428EE0	1.00	3.40	6.18	6.18
#FFFFFF	3.40	1.00	21.00	21.00
#000000	6.18	21.00	1.00	1.00
##000000	6.18	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6993E3

Deuteranopia (green-blind)

#5184DE

Tritanopia (blue-blind)

#00A1AC

Achromatopsia (no color)

#8B8B8B

Design tokens & code

CSS

--color: #428ee0;
/* rgb */ color: rgb(66, 142, 224);
/* oklch */ color: oklch(63.7% 0.145 252.5);

Tailwind

colors: {
  custom: {
    50: '#88aeea',
    500: '#428ee0',
    950: '#000000',
  },
}

SCSS

$custom: #428ee0;
$custom-light: #88aeea;
$custom-dark: #000000;

JSON

{
  "hex": "#428ee0",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 224
  },
  "hsl": {
    "h": 211.139,
    "s": 71.818,
    "l": 56.863
  },
  "oklch": {
    "l": 0.63747,
    "c": 0.14469,
    "h": 252.5
  },
  "luminance": 0.25886
}

Semantic roles & 50–950 ramp

primary

#428EE0

secondary

#DFC09F

accent

#9739EF

background

#F9FAFE

surface

#F1F4FD

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428EE0

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

Preview Lab → · Contrast checker → · Palette generator →