#428BD9#428BD9

#428BD9 is a light, vivid cyan. Relative luminance 0.246; OKLCH L 62.7% C 0.139 H 252.2°. Best body text is #000000 at 5.93:1 contrast (WCAG AA passes).

Color values

HEX	#428BD9
RGB	rgb(66, 139, 217)
HSL	hsl(211, 67%, 55%)
HSV	hsv(211, 70%, 85%)
CMYK	cmyk(69.6%, 35.9%, 0%, 14.9%)
CIE-LAB	lab(56.71, 2.60, -46.52)
CIE-LCH	lch(56.71, 46.59, 273.20°)
OKLab	oklab(62.68% -0.0423 -0.1322)
OKLCH	oklch(62.68% 0.139 252.2)
XYZ	xyz(23.9991, 24.6307, 69.1216)
Luminance	0.2463 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BD9 #D99042

analogous

#42D7D9 #428BD9 #4442D9

triadic

#428BD9 #D9428B #8BD942

tetradic

#428BD9 #D942D7 #D99042 #42D944

square

#428BD9 #D942D7 #D99042 #42D944

split-complementary

#428BD9 #D94442 #D7D942

monochromatic

#1B4F86 #256CB9 #428BD9 #75AAE3 #A8CAED

Accessibility & contrast

On white

3.54

#428BD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.93

#428BD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BD9

5.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BD9	#FFFFFF	#000000	##000000
##428BD9	1.00	3.54	5.93	5.93
#FFFFFF	3.54	1.00	21.00	21.00
#000000	5.93	21.00	1.00	1.00
##000000	5.93	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6890DC

Deuteranopia (green-blind)

#5282D7

Tritanopia (blue-blind)

#009DA8

Achromatopsia (no color)

#888888

Design tokens & code

CSS

--color: #428bd9;
/* rgb */ color: rgb(66, 139, 217);
/* oklch */ color: oklch(62.7% 0.139 252.2);

Tailwind

colors: {
  custom: {
    50: '#87ace5',
    500: '#428bd9',
    950: '#000000',
  },
}

SCSS

$custom: #428bd9;
$custom-light: #87ace5;
$custom-dark: #000000;

JSON

{
  "hex": "#428bd9",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 217
  },
  "hsl": {
    "h": 210.993,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.62681,
    "c": 0.13885,
    "h": 252.2
  },
  "luminance": 0.24633
}

Semantic roles & 50–950 ramp

primary

#428BD9

secondary

#DBBC9C

accent

#973EE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1016

muted

#7D7F84

Preview Lab

Preview with #428BD9

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

Preview Lab → · Contrast checker → · Palette generator →