#428AB7#428AB7

#428AB7 is a mid, moderate cyan. Relative luminance 0.228; OKLCH L 60.7% C 0.099 H 238.8°. Best body text is #000000 at 5.55:1 contrast (WCAG AA passes).

Color values

HEX	#428AB7
RGB	rgb(66, 138, 183)
HSL	hsl(203, 47%, 49%)
HSV	hsv(203, 64%, 72%)
CMYK	cmyk(63.9%, 24.6%, 0%, 28.2%)
CIE-LAB	lab(54.82, -8.45, -30.26)
CIE-LCH	lch(54.82, 31.42, 254.40°)
OKLab	oklab(60.66% -0.0514 -0.085)
OKLCH	oklch(60.66% 0.099 238.8)
XYZ	xyz(19.8792, 22.7521, 48.1345)
Luminance	0.2275 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428AB7 #B76F42

analogous

#42B7AA #428AB7 #4250B7

triadic

#428AB7 #B7428A #8AB742

tetradic

#428AB7 #AA42B7 #B76F42 #50B742

square

#428AB7 #AA42B7 #B76F42 #50B742

split-complementary

#428AB7 #B74250 #B7AA42

monochromatic

#22465D #32688A #428AB7 #6CA6CA #99C1DA

Accessibility & contrast

On white

3.78

#428AB7 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.55

#428AB7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428AB7

5.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428AB7	#FFFFFF	#000000	##000000
##428AB7	1.00	3.78	5.55	5.55
#FFFFFF	3.78	1.00	21.00	21.00
#000000	5.55	21.00	1.00	1.00
##000000	5.55	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#758AB9

Deuteranopia (green-blind)

#657EB6

Tritanopia (blue-blind)

#009599

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #428ab7;
/* rgb */ color: rgb(66, 138, 183);
/* oklch */ color: oklch(60.7% 0.099 238.8);

Tailwind

colors: {
  custom: {
    50: '#82accc',
    500: '#428ab7',
    950: '#000000',
  },
}

SCSS

$custom: #428ab7;
$custom-light: #82accc;
$custom-dark: #000000;

JSON

{
  "hex": "#428ab7",
  "rgb": {
    "r": 66,
    "g": 138,
    "b": 183
  },
  "hsl": {
    "h": 203.077,
    "s": 46.988,
    "l": 48.824
  },
  "oklch": {
    "l": 0.6066,
    "c": 0.09933,
    "h": 238.8
  },
  "luminance": 0.22754
}

Semantic roles & 50–950 ramp

primary

#428AB7

secondary

#C6A48F

accent

#8551D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428AB7

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

Preview Lab → · Contrast checker → · Palette generator →