#428EDD#428EDD

#428EDD is a light, vivid cyan. Relative luminance 0.257; OKLCH L 63.6% C 0.141 H 251.7°. Best body text is #000000 at 6.14:1 contrast (WCAG AA passes).

Color values

HEX	#428EDD
RGB	rgb(66, 142, 221)
HSL	hsl(211, 70%, 56%)
HSV	hsv(211, 70%, 87%)
CMYK	cmyk(70.1%, 35.7%, 0%, 13.3%)
CIE-LAB	lab(57.77, 2.23, -47.08)
CIE-LCH	lch(57.77, 47.14, 272.71°)
OKLab	oklab(63.58% -0.0442 -0.1338)
OKLCH	oklch(63.58% 0.141 251.7)
XYZ	xyz(24.9661, 25.7220, 72.0417)
Luminance	0.2572 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EDD #DD9142

analogous

#42DBDD #428EDD #4442DD

triadic

#428EDD #DD428E #8EDD42

tetradic

#428EDD #DD42DB #DD9142 #42DD44

square

#428EDD #DD42DB #DD9142 #42DD44

split-complementary

#428EDD #DD4442 #DBDD42

monochromatic

#19518C #226FBF #428EDD #76ADE6 #AACCF0

Accessibility & contrast

On white

3.42

#428EDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.14

#428EDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EDD

6.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EDD	#FFFFFF	#000000	##000000
##428EDD	1.00	3.42	6.14	6.14
#FFFFFF	3.42	1.00	21.00	21.00
#000000	6.14	21.00	1.00	1.00
##000000	6.14	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6A93E0

Deuteranopia (green-blind)

#5484DB

Tritanopia (blue-blind)

#00A1AB

Achromatopsia (no color)

#8B8B8B

Design tokens & code

CSS

--color: #428edd;
/* rgb */ color: rgb(66, 142, 221);
/* oklch */ color: oklch(63.6% 0.141 251.7);

Tailwind

colors: {
  custom: {
    50: '#88aee8',
    500: '#428edd',
    950: '#000000',
  },
}

SCSS

$custom: #428edd;
$custom-light: #88aee8;
$custom-dark: #000000;

JSON

{
  "hex": "#428edd",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 221
  },
  "hsl": {
    "h": 210.581,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.63577,
    "c": 0.14094,
    "h": 251.7
  },
  "luminance": 0.25725
}

Semantic roles & 50–950 ramp

primary

#428EDD

secondary

#DDBE9D

accent

#963BEC

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428EDD

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

Preview Lab → · Contrast checker → · Palette generator →