#428FBC#428FBC

#428FBC is a light, moderate cyan. Relative luminance 0.244; OKLCH L 62.1% C 0.102 H 237.2°. Best body text is #000000 at 5.89:1 contrast (WCAG AA passes).

Color values

HEX	#428FBC
RGB	rgb(66, 143, 188)
HSL	hsl(202, 48%, 50%)
HSV	hsv(202, 65%, 74%)
CMYK	cmyk(64.9%, 23.9%, 0%, 26.3%)
CIE-LAB	lab(56.52, -9.62, -30.46)
CIE-LCH	lch(56.52, 31.95, 252.47°)
OKLab	oklab(62.08% -0.055 -0.0855)
OKLCH	oklch(62.08% 0.102 237.2)
XYZ	xyz(21.1428, 24.4318, 51.1688)
Luminance	0.2443 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FBC #BC6F42

analogous

#42BCAC #428FBC #4252BC

triadic

#428FBC #BC428F #8FBC42

tetradic

#428FBC #AC42BC #BC6F42 #52BC42

square

#428FBC #AC42BC #BC6F42 #52BC42

split-complementary

#428FBC #BC4252 #BCAC42

monochromatic

#224A61 #326D8F #428FBC #6FAACC #9CC5DC

Accessibility & contrast

On white

3.57

#428FBC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.89

#428FBC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FBC

5.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FBC	#FFFFFF	#000000	##000000
##428FBC	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)

#7A8EBE

Deuteranopia (green-blind)

#6982BB

Tritanopia (blue-blind)

#009B9E

Achromatopsia (no color)

#888888

Design tokens & code

CSS

--color: #428fbc;
/* rgb */ color: rgb(66, 143, 188);
/* oklch */ color: oklch(62.1% 0.102 237.2);

Tailwind

colors: {
  custom: {
    50: '#83afd0',
    500: '#428fbc',
    950: '#000000',
  },
}

SCSS

$custom: #428fbc;
$custom-light: #83afd0;
$custom-dark: #000000;

JSON

{
  "hex": "#428fbc",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 188
  },
  "hsl": {
    "h": 202.131,
    "s": 48.031,
    "l": 49.804
  },
  "oklch": {
    "l": 0.6208,
    "c": 0.10171,
    "h": 237.2
  },
  "luminance": 0.24434
}

Semantic roles & 50–950 ramp

primary

#428FBC

secondary

#C9A691

accent

#8250D8

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428FBC

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

Preview Lab → · Contrast checker → · Palette generator →