#428BB7#428BB7

#428BB7 is a mid, moderate cyan. Relative luminance 0.230; OKLCH L 60.9% C 0.099 H 237.9°. Best body text is #000000 at 5.61:1 contrast (WCAG AA passes).

Color values

HEX	#428BB7
RGB	rgb(66, 139, 183)
HSL	hsl(203, 47%, 49%)
HSV	hsv(203, 64%, 72%)
CMYK	cmyk(63.9%, 24%, 0%, 28.2%)
CIE-LAB	lab(55.11, -9.01, -29.80)
CIE-LCH	lch(55.11, 31.13, 253.17°)
OKLab	oklab(60.9% -0.0525 -0.0836)
OKLCH	oklch(60.9% 0.099 237.9)
XYZ	xyz(20.0234, 23.0404, 48.1826)
Luminance	0.2304 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB7 #B76E42

analogous

#42B7A9 #428BB7 #4251B7

triadic

#428BB7 #B7428B #8BB742

tetradic

#428BB7 #A942B7 #B76E42 #51B742

square

#428BB7 #A942B7 #B76E42 #51B742

split-complementary

#428BB7 #B74251 #B7A942

monochromatic

#22475D #32698A #428BB7 #6CA7CA #99C2DA

Accessibility & contrast

On white

3.74

#428BB7 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.61

#428BB7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB7

5.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB7	#FFFFFF	#000000	##000000
##428BB7	1.00	3.74	5.61	5.61
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.61	21.00	1.00	1.00
##000000	5.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#778BB9

Deuteranopia (green-blind)

#677FB6

Tritanopia (blue-blind)

#00969A

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428bb7;
/* rgb */ color: rgb(66, 139, 183);
/* oklch */ color: oklch(60.9% 0.099 237.9);

Tailwind

colors: {
  custom: {
    50: '#82accc',
    500: '#428bb7',
    950: '#000000',
  },
}

SCSS

$custom: #428bb7;
$custom-light: #82accc;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb7",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 183
  },
  "hsl": {
    "h": 202.564,
    "s": 46.988,
    "l": 48.824
  },
  "oklch": {
    "l": 0.60896,
    "c": 0.09875,
    "h": 237.9
  },
  "luminance": 0.23042
}

Semantic roles & 50–950 ramp

primary

#428BB7

secondary

#C6A48F

accent

#8351D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB7

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

Preview Lab → · Contrast checker → · Palette generator →