#428DD9#428DD9

#428DD9 is a light, vivid cyan. Relative luminance 0.252; OKLCH L 63.1% C 0.137 H 251.1°. Best body text is #000000 at 6.04:1 contrast (WCAG AA passes).

Color values

HEX	#428DD9
RGB	rgb(66, 141, 217)
HSL	hsl(210, 67%, 55%)
HSV	hsv(210, 70%, 85%)
CMYK	cmyk(69.6%, 35%, 0%, 14.9%)
CIE-LAB	lab(57.28, 1.42, -45.62)
CIE-LCH	lch(57.28, 45.64, 271.79°)
OKLab	oklab(63.13% -0.0442 -0.1296)
OKLCH	oklch(63.13% 0.137 251.1)
XYZ	xyz(24.2914, 25.2151, 69.2190)
Luminance	0.2522 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DD9 #D98E42

analogous

#42D8D9 #428DD9 #4242D9

triadic

#428DD9 #D9428D #8DD942

tetradic

#428DD9 #D942D8 #D98E42 #42D942

square

#428DD9 #D942D8 #D98E42 #42D942

split-complementary

#428DD9 #D94242 #D8D942

monochromatic

#1B5086 #256EB9 #428DD9 #75ACE3 #A8CAED

Accessibility & contrast

On white

3.47

#428DD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.04

#428DD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DD9

6.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DD9	#FFFFFF	#000000	##000000
##428DD9	1.00	3.47	6.04	6.04
#FFFFFF	3.47	1.00	21.00	21.00
#000000	6.04	21.00	1.00	1.00
##000000	6.04	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6B91DC

Deuteranopia (green-blind)

#5583D7

Tritanopia (blue-blind)

#009FA9

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428dd9;
/* rgb */ color: rgb(66, 141, 217);
/* oklch */ color: oklch(63.1% 0.137 251.1);

Tailwind

colors: {
  custom: {
    50: '#87ade5',
    500: '#428dd9',
    950: '#000000',
  },
}

SCSS

$custom: #428dd9;
$custom-light: #87ade5;
$custom-dark: #000000;

JSON

{
  "hex": "#428dd9",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 217
  },
  "hsl": {
    "h": 210.199,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.63128,
    "c": 0.13691,
    "h": 251.1
  },
  "luminance": 0.25218
}

Semantic roles & 50–950 ramp

primary

#428DD9

secondary

#DBBC9C

accent

#943EE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1016

muted

#7D7F84

Preview Lab

Preview with #428DD9

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

Preview Lab → · Contrast checker → · Palette generator →