#428BB4#428BB4

#428BB4 is a mid, moderate cyan. Relative luminance 0.229; OKLCH L 60.8% C 0.096 H 236.0°. Best body text is #000000 at 5.58:1 contrast (WCAG AA passes).

Color values

HEX	#428BB4
RGB	rgb(66, 139, 180)
HSL	hsl(202, 46%, 48%)
HSV	hsv(202, 63%, 71%)
CMYK	cmyk(63.3%, 22.8%, 0%, 29.4%)
CIE-LAB	lab(54.99, -10.00, -28.28)
CIE-LCH	lch(54.99, 30.00, 250.52°)
OKLab	oklab(60.75% -0.0535 -0.0793)
OKLCH	oklch(60.75% 0.096 236)
XYZ	xyz(19.7144, 22.9168, 46.5556)
Luminance	0.2292 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB4 #B46B42

analogous

#42B4A4 #428BB4 #4252B4

triadic

#428BB4 #B4428B #8BB442

tetradic

#428BB4 #A442B4 #B46B42 #52B442

square

#428BB4 #A442B4 #B46B42 #52B442

split-complementary

#428BB4 #B44252 #B4A442

monochromatic

#21465A #326887 #428BB4 #6BA7C9 #97C1D9

Accessibility & contrast

On white

3.76

#428BB4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.58

#428BB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB4

5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB4	#FFFFFF	#000000	##000000
##428BB4	1.00	3.76	5.58	5.58
#FFFFFF	3.76	1.00	21.00	21.00
#000000	5.58	21.00	1.00	1.00
##000000	5.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#788AB6

Deuteranopia (green-blind)

#687FB3

Tritanopia (blue-blind)

#009699

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428bb4;
/* rgb */ color: rgb(66, 139, 180);
/* oklch */ color: oklch(60.8% 0.096 236.0);

Tailwind

colors: {
  custom: {
    50: '#82acca',
    500: '#428bb4',
    950: '#000000',
  },
}

SCSS

$custom: #428bb4;
$custom-light: #82acca;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb4",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 180
  },
  "hsl": {
    "h": 201.579,
    "s": 46.341,
    "l": 48.235
  },
  "oklch": {
    "l": 0.60753,
    "c": 0.09567,
    "h": 236
  },
  "luminance": 0.22919
}

Semantic roles & 50–950 ramp

primary

#428BB4

secondary

#C5A18D

accent

#8152D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB4

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

Preview Lab → · Contrast checker → · Palette generator →