#428EB3#428EB3

#428EB3 is a mid, moderate cyan. Relative luminance 0.238; OKLCH L 61.4% C 0.093 H 232.2°. Best body text is #000000 at 5.75:1 contrast (WCAG AA passes).

Color values

HEX	#428EB3
RGB	rgb(66, 142, 179)
HSL	hsl(200, 46%, 48%)
HSV	hsv(200, 63%, 70%)
CMYK	cmyk(63.1%, 20.7%, 0%, 29.8%)
CIE-LAB	lab(55.84, -12.01, -26.38)
CIE-LCH	lch(55.84, 28.99, 245.52°)
OKLab	oklab(61.42% -0.0572 -0.0738)
OKLCH	oklch(61.42% 0.093 232.2)
XYZ	xyz(20.0533, 23.7569, 46.1678)
Luminance	0.2376 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EB3 #B36742

analogous

#42B39F #428EB3 #4256B3

triadic

#428EB3 #B3428E #8EB342

tetradic

#428EB3 #9F42B3 #B36742 #56B342

square

#428EB3 #9F42B3 #B36742 #56B342

split-complementary

#428EB3 #B34256 #B39F42

monochromatic

#21475A #326B86 #428EB3 #6AA9C8 #97C3D9

Accessibility & contrast

On white

3.65

#428EB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.75

#428EB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EB3

5.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EB3	#FFFFFF	#000000	##000000
##428EB3	1.00	3.65	5.75	5.75
#FFFFFF	3.65	1.00	21.00	21.00
#000000	5.75	21.00	1.00	1.00
##000000	5.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7C8CB5

Deuteranopia (green-blind)

#6C81B2

Tritanopia (blue-blind)

#00989A

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428eb3;
/* rgb */ color: rgb(66, 142, 179);
/* oklch */ color: oklch(61.4% 0.093 232.2);

Tailwind

colors: {
  custom: {
    50: '#82afca',
    500: '#428eb3',
    950: '#000000',
  },
}

SCSS

$custom: #428eb3;
$custom-light: #82afca;
$custom-dark: #000000;

JSON

{
  "hex": "#428eb3",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 179
  },
  "hsl": {
    "h": 199.646,
    "s": 46.122,
    "l": 48.039
  },
  "oklch": {
    "l": 0.61421,
    "c": 0.09336,
    "h": 232.2
  },
  "luminance": 0.23759
}

Semantic roles & 50–950 ramp

primary

#428EB3

secondary

#C49F8C

accent

#7D52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428EB3

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

Preview Lab → · Contrast checker → · Palette generator →