#428EB8#428EB8

#428EB8 is a mid, moderate cyan. Relative luminance 0.240; OKLCH L 61.7% C 0.098 H 235.7°. Best body text is #000000 at 5.79:1 contrast (WCAG AA passes).

Color values

HEX	#428EB8
RGB	rgb(66, 142, 184)
HSL	hsl(201, 47%, 49%)
HSV	hsv(201, 64%, 72%)
CMYK	cmyk(64.1%, 22.8%, 0%, 27.8%)
CIE-LAB	lab(56.05, -10.38, -28.91)
CIE-LCH	lch(56.05, 30.72, 250.26°)
OKLab	oklab(61.65% -0.0554 -0.0811)
OKLCH	oklch(61.65% 0.098 235.7)
XYZ	xyz(20.5682, 23.9629, 48.8794)
Luminance	0.2397 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EB8 #B86C42

analogous

#42B8A7 #428EB8 #4253B8

triadic

#428EB8 #B8428E #8EB842

tetradic

#428EB8 #A742B8 #B86C42 #53B842

square

#428EB8 #A742B8 #B86C42 #53B842

split-complementary

#428EB8 #B84253 #B8A742

monochromatic

#22485E #326B8B #428EB8 #6DA9CB #9AC4DB

Accessibility & contrast

On white

3.63

#428EB8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.79

#428EB8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EB8

5.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EB8	#FFFFFF	#000000	##000000
##428EB8	1.00	3.63	5.79	5.79
#FFFFFF	3.63	1.00	21.00	21.00
#000000	5.79	21.00	1.00	1.00
##000000	5.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7A8DBA

Deuteranopia (green-blind)

#6A81B7

Tritanopia (blue-blind)

#00999C

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428eb8;
/* rgb */ color: rgb(66, 142, 184);
/* oklch */ color: oklch(61.7% 0.098 235.7);

Tailwind

colors: {
  custom: {
    50: '#82afcd',
    500: '#428eb8',
    950: '#000000',
  },
}

SCSS

$custom: #428eb8;
$custom-light: #82afcd;
$custom-dark: #000000;

JSON

{
  "hex": "#428eb8",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 184
  },
  "hsl": {
    "h": 201.356,
    "s": 47.2,
    "l": 49.02
  },
  "oklch": {
    "l": 0.61654,
    "c": 0.09818,
    "h": 235.7
  },
  "luminance": 0.23965
}

Semantic roles & 50–950 ramp

primary

#428EB8

secondary

#C7A38F

accent

#8151D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428EB8

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

Preview Lab → · Contrast checker → · Palette generator →