#428CD8#428CD8

#428CD8 is a light, vivid cyan. Relative luminance 0.249; OKLCH L 62.8% C 0.137 H 251.4°. Best body text is #000000 at 5.97:1 contrast (WCAG AA passes).

Color values

HEX	#428CD8
RGB	rgb(66, 140, 216)
HSL	hsl(210, 66%, 55%)
HSV	hsv(210, 69%, 85%)
CMYK	cmyk(69.4%, 35.2%, 0%, 15.3%)
CIE-LAB	lab(56.95, 1.66, -45.59)
CIE-LCH	lch(56.95, 45.62, 272.09°)
OKLab	oklab(62.85% -0.0435 -0.1295)
OKLCH	oklch(62.85% 0.137 251.4)
XYZ	xyz(24.0149, 24.8697, 68.4871)
Luminance	0.2487 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CD8 #D88E42

analogous

#42D7D8 #428CD8 #4342D8

triadic

#428CD8 #D8428C #8CD842

tetradic

#428CD8 #D842D7 #D88E42 #42D843

square

#428CD8 #D842D7 #D88E42 #42D843

split-complementary

#428CD8 #D84342 #D7D842

monochromatic

#1B4F84 #266DB7 #428CD8 #75ABE2 #A7CAED

Accessibility & contrast

On white

3.51

#428CD8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.97

#428CD8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CD8

5.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CD8	#FFFFFF	#000000	##000000
##428CD8	1.00	3.51	5.97	5.97
#FFFFFF	3.51	1.00	21.00	21.00
#000000	5.97	21.00	1.00	1.00
##000000	5.97	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6A90DB

Deuteranopia (green-blind)

#5482D6

Tritanopia (blue-blind)

#009EA8

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428cd8;
/* rgb */ color: rgb(66, 140, 216);
/* oklch */ color: oklch(62.8% 0.137 251.4);

Tailwind

colors: {
  custom: {
    50: '#87ade4',
    500: '#428cd8',
    950: '#000000',
  },
}

SCSS

$custom: #428cd8;
$custom-light: #87ade4;
$custom-dark: #000000;

JSON

{
  "hex": "#428cd8",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 216
  },
  "hsl": {
    "h": 210.4,
    "s": 65.789,
    "l": 55.294
  },
  "oklch": {
    "l": 0.62848,
    "c": 0.13663,
    "h": 251.4
  },
  "luminance": 0.24872
}

Semantic roles & 50–950 ramp

primary

#428CD8

secondary

#DABB9C

accent

#953FE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1015

muted

#7D7F84

Preview Lab

Preview with #428CD8

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

Preview Lab → · Contrast checker → · Palette generator →