#428CB3#428CB3

#428CB3 is a mid, moderate cyan. Relative luminance 0.232; OKLCH L 60.9% C 0.094 H 234.3°. Best body text is #000000 at 5.63:1 contrast (WCAG AA passes).

Color values

HEX	#428CB3
RGB	rgb(66, 140, 179)
HSL	hsl(201, 46%, 48%)
HSV	hsv(201, 63%, 70%)
CMYK	cmyk(63.1%, 21.8%, 0%, 29.8%)
CIE-LAB	lab(55.24, -10.89, -27.31)
CIE-LCH	lch(55.24, 29.40, 248.25°)
OKLab	oklab(60.94% -0.055 -0.0765)
OKLCH	oklch(60.94% 0.094 234.3)
XYZ	xyz(19.7584, 23.1671, 46.0695)
Luminance	0.2317 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CB3 #B36942

analogous

#42B3A1 #428CB3 #4253B3

triadic

#428CB3 #B3428C #8CB342

tetradic

#428CB3 #A142B3 #B36942 #53B342

square

#428CB3 #A142B3 #B36942 #53B342

split-complementary

#428CB3 #B34253 #B3A142

monochromatic

#21465A #326986 #428CB3 #6AA8C8 #97C2D9

Accessibility & contrast

On white

3.73

#428CB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.63

#428CB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CB3

5.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CB3	#FFFFFF	#000000	##000000
##428CB3	1.00	3.73	5.63	5.63
#FFFFFF	3.73	1.00	21.00	21.00
#000000	5.63	21.00	1.00	1.00
##000000	5.63	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#798BB5

Deuteranopia (green-blind)

#6A7FB2

Tritanopia (blue-blind)

#009699

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428cb3;
/* rgb */ color: rgb(66, 140, 179);
/* oklch */ color: oklch(60.9% 0.094 234.3);

Tailwind

colors: {
  custom: {
    50: '#81adca',
    500: '#428cb3',
    950: '#000000',
  },
}

SCSS

$custom: #428cb3;
$custom-light: #81adca;
$custom-dark: #000000;

JSON

{
  "hex": "#428cb3",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 179
  },
  "hsl": {
    "h": 200.708,
    "s": 46.122,
    "l": 48.039
  },
  "oklch": {
    "l": 0.60944,
    "c": 0.09421,
    "h": 234.3
  },
  "luminance": 0.23169
}

Semantic roles & 50–950 ramp

primary

#428CB3

secondary

#C4A08C

accent

#7F52D6

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428CB3

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

Preview Lab → · Contrast checker → · Palette generator →