#428CD9#428CD9

#428CD9 is a light, vivid cyan. Relative luminance 0.249; OKLCH L 62.9% C 0.138 H 251.7°. Best body text is #000000 at 5.98:1 contrast (WCAG AA passes).

Color values

HEX	#428CD9
RGB	rgb(66, 140, 217)
HSL	hsl(211, 67%, 55%)
HSV	hsv(211, 70%, 85%)
CMYK	cmyk(69.6%, 35.5%, 0%, 14.9%)
CIE-LAB	lab(57.00, 2.01, -46.07)
CIE-LCH	lch(57.00, 46.11, 272.50°)
OKLab	oklab(62.91% -0.0433 -0.1309)
OKLCH	oklch(62.91% 0.138 251.7)
XYZ	xyz(24.1446, 24.9216, 69.1701)
Luminance	0.2492 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CD9 #D98F42

analogous

#42D8D9 #428CD9 #4342D9

triadic

#428CD9 #D9428C #8CD942

tetradic

#428CD9 #D942D8 #D98F42 #42D943

square

#428CD9 #D942D8 #D98F42 #42D943

split-complementary

#428CD9 #D94342 #D8D942

monochromatic

#1B4F86 #256DB9 #428CD9 #75ABE3 #A8CAED

Accessibility & contrast

On white

3.51

#428CD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.98

#428CD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CD9

5.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CD9	#FFFFFF	#000000	##000000
##428CD9	1.00	3.51	5.98	5.98
#FFFFFF	3.51	1.00	21.00	21.00
#000000	5.98	21.00	1.00	1.00
##000000	5.98	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6991DC

Deuteranopia (green-blind)

#5382D7

Tritanopia (blue-blind)

#009EA8

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428cd9;
/* rgb */ color: rgb(66, 140, 217);
/* oklch */ color: oklch(62.9% 0.138 251.7);

Tailwind

colors: {
  custom: {
    50: '#87ade5',
    500: '#428cd9',
    950: '#000000',
  },
}

SCSS

$custom: #428cd9;
$custom-light: #87ade5;
$custom-dark: #000000;

JSON

{
  "hex": "#428cd9",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 217
  },
  "hsl": {
    "h": 210.596,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.62905,
    "c": 0.13788,
    "h": 251.7
  },
  "luminance": 0.24924
}

Semantic roles & 50–950 ramp

primary

#428CD9

secondary

#DBBC9C

accent

#963EE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1016

muted

#7D7F84

Preview Lab

Preview with #428CD9

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

Preview Lab → · Contrast checker → · Palette generator →