#428CBC#428CBC

#428CBC is a mid, moderate cyan. Relative luminance 0.235; OKLCH L 61.4% C 0.103 H 239.9°. Best body text is #000000 at 5.71:1 contrast (WCAG AA passes).

Color values

HEX	#428CBC
RGB	rgb(66, 140, 188)
HSL	hsl(204, 48%, 50%)
HSV	hsv(204, 65%, 74%)
CMYK	cmyk(64.9%, 25.5%, 0%, 26.3%)
CIE-LAB	lab(55.63, -7.92, -31.85)
CIE-LCH	lch(55.63, 32.82, 256.03°)
OKLab	oklab(61.37% -0.0519 -0.0895)
OKLCH	oklch(61.37% 0.103 239.9)
XYZ	xyz(20.6985, 23.5431, 51.0207)
Luminance	0.2354 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CBC #BC7242

analogous

#42BCAF #428CBC #424FBC

triadic

#428CBC #BC428C #8CBC42

tetradic

#428CBC #AF42BC #BC7242 #4FBC42

square

#428CBC #AF42BC #BC7242 #4FBC42

split-complementary

#428CBC #BC424F #BCAF42

monochromatic

#224961 #326A8F #428CBC #6FA8CC #9CC3DC

Accessibility & contrast

On white

3.68

#428CBC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.71

#428CBC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CBC

5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CBC	#FFFFFF	#000000	##000000
##428CBC	1.00	3.68	5.71	5.71
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.71	21.00	1.00	1.00
##000000	5.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#768CBE

Deuteranopia (green-blind)

#6580BB

Tritanopia (blue-blind)

#00989C

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428cbc;
/* rgb */ color: rgb(66, 140, 188);
/* oklch */ color: oklch(61.4% 0.103 239.9);

Tailwind

colors: {
  custom: {
    50: '#83add0',
    500: '#428cbc',
    950: '#000000',
  },
}

SCSS

$custom: #428cbc;
$custom-light: #83add0;
$custom-dark: #000000;

JSON

{
  "hex": "#428cbc",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 188
  },
  "hsl": {
    "h": 203.607,
    "s": 48.031,
    "l": 49.804
  },
  "oklch": {
    "l": 0.61374,
    "c": 0.10349,
    "h": 239.9
  },
  "luminance": 0.23545
}

Semantic roles & 50–950 ramp

primary

#428CBC

secondary

#C9A791

accent

#8550D8

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428CBC

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

Preview Lab → · Contrast checker → · Palette generator →