#428BD5#428BD5

#428BD5 is a light, vivid cyan. Relative luminance 0.244; OKLCH L 62.5% C 0.134 H 251.1°. Best body text is #000000 at 5.89:1 contrast (WCAG AA passes).

Color values

HEX	#428BD5
RGB	rgb(66, 139, 213)
HSL	hsl(210, 64%, 55%)
HSV	hsv(210, 69%, 84%)
CMYK	cmyk(69%, 34.7%, 0%, 16.5%)
CIE-LAB	lab(56.51, 1.21, -44.60)
CIE-LCH	lch(56.51, 44.61, 271.55°)
OKLab	oklab(62.46% -0.0434 -0.1266)
OKLCH	oklch(62.46% 0.134 251.1)
XYZ	xyz(23.4852, 24.4251, 66.4147)
Luminance	0.2443 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BD5 #D58C42

analogous

#42D4D5 #428BD5 #4342D5

triadic

#428BD5 #D5428B #8BD542

tetradic

#428BD5 #D542D4 #D58C42 #42D543

square

#428BD5 #D542D4 #D58C42 #42D543

split-complementary

#428BD5 #D54342 #D4D542

monochromatic

#1C4E80 #286CB2 #428BD5 #74AAE0 #A6C8EB

Accessibility & contrast

On white

3.57

#428BD5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.89

#428BD5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BD5

5.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BD5	#FFFFFF	#000000	##000000
##428BD5	1.00	3.57	5.89	5.89
#FFFFFF	3.57	1.00	21.00	21.00
#000000	5.89	21.00	1.00	1.00
##000000	5.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6A8FD8

Deuteranopia (green-blind)

#5581D4

Tritanopia (blue-blind)

#009CA6

Achromatopsia (no color)

#888888

Design tokens & code

CSS

--color: #428bd5;
/* rgb */ color: rgb(66, 139, 213);
/* oklch */ color: oklch(62.5% 0.134 251.1);

Tailwind

colors: {
  custom: {
    50: '#86ace2',
    500: '#428bd5',
    950: '#000000',
  },
}

SCSS

$custom: #428bd5;
$custom-light: #86ace2;
$custom-dark: #000000;

JSON

{
  "hex": "#428bd5",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 213
  },
  "hsl": {
    "h": 210.204,
    "s": 63.636,
    "l": 54.706
  },
  "oklch": {
    "l": 0.62456,
    "c": 0.13383,
    "h": 251.1
  },
  "luminance": 0.24428
}

Semantic roles & 50–950 ramp

primary

#428BD5

secondary

#D8BA9A

accent

#9441E7

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BD5

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

Preview Lab → · Contrast checker → · Palette generator →