#428DDB#428DDB

#428DDB is a light, vivid cyan. Relative luminance 0.253; OKLCH L 63.2% C 0.139 H 251.7°. Best body text is #000000 at 6.06:1 contrast (WCAG AA passes).

Color values

HEX	#428DDB
RGB	rgb(66, 141, 219)
HSL	hsl(211, 68%, 56%)
HSV	hsv(211, 70%, 86%)
CMYK	cmyk(69.9%, 35.6%, 0%, 14.1%)
CIE-LAB	lab(57.39, 2.12, -46.58)
CIE-LCH	lch(57.39, 46.62, 272.61°)
OKLab	oklab(63.24% -0.0437 -0.1324)
OKLCH	oklch(63.24% 0.139 251.7)
XYZ	xyz(24.5531, 25.3198, 70.5973)
Luminance	0.2532 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DDB #DB9042

analogous

#42DADB #428DDB #4342DB

triadic

#428DDB #DB428D #8DDB42

tetradic

#428DDB #DB42DA #DB9042 #42DB43

square

#428DDB #DB42DA #DB9042 #42DB43

split-complementary

#428DDB #DB4342 #DADB42

monochromatic

#1A5089 #246EBC #428DDB #75ACE5 #A9CBEF

Accessibility & contrast

On white

3.46

#428DDB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.06

#428DDB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DDB

6.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DDB	#FFFFFF	#000000	##000000
##428DDB	1.00	3.46	6.06	6.06
#FFFFFF	3.46	1.00	21.00	21.00
#000000	6.06	21.00	1.00	1.00
##000000	6.06	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6A92DE

Deuteranopia (green-blind)

#5483D9

Tritanopia (blue-blind)

#009FAA

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428ddb;
/* rgb */ color: rgb(66, 141, 219);
/* oklch */ color: oklch(63.2% 0.139 251.7);

Tailwind

colors: {
  custom: {
    50: '#87ade6',
    500: '#428ddb',
    950: '#000000',
  },
}

SCSS

$custom: #428ddb;
$custom-light: #87ade6;
$custom-dark: #000000;

JSON

{
  "hex": "#428ddb",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 219
  },
  "hsl": {
    "h": 210.588,
    "s": 68,
    "l": 55.882
  },
  "oklch": {
    "l": 0.63241,
    "c": 0.13941,
    "h": 251.7
  },
  "luminance": 0.25322
}

Semantic roles & 50–950 ramp

primary

#428DDB

secondary

#DCBD9D

accent

#963DEB

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428DDB

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

Preview Lab → · Contrast checker → · Palette generator →