#428FA4#428FA4

#428FA4 is a mid, moderate cyan. Relative luminance 0.235; OKLCH L 61.0% C 0.082 H 218.3°. Best body text is #000000 at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#428FA4
RGB	rgb(66, 143, 164)
HSL	hsl(193, 43%, 45%)
HSV	hsv(193, 60%, 64%)
CMYK	cmyk(59.8%, 12.8%, 0%, 35.7%)
CIE-LAB	lab(55.57, -17.31, -18.23)
CIE-LCH	lch(55.57, 25.14, 226.48°)
OKLab	oklab(61.01% -0.064 -0.0506)
OKLCH	oklch(61.01% 0.082 218.3)
XYZ	xyz(18.7674, 23.4817, 38.6581)
Luminance	0.2348 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FA4 #A45742

analogous

#42A488 #428FA4 #425EA4

triadic

#428FA4 #A4428F #8FA442

tetradic

#428FA4 #8842A4 #A45742 #5EA442

square

#428FA4 #8842A4 #A45742 #5EA442

split-complementary

#428FA4 #A4425E #A48842

monochromatic

#1F434D #306978 #428FA4 #63ACC0 #8FC3D2

Accessibility & contrast

On white

3.69

#428FA4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.70

#428FA4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FA4

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FA4	#FFFFFF	#000000	##000000
##428FA4	1.00	3.69	5.70	5.70
#FFFFFF	3.69	1.00	21.00	21.00
#000000	5.70	21.00	1.00	1.00
##000000	5.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#818BA5

Deuteranopia (green-blind)

#7380A4

Tritanopia (blue-blind)

#009696

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428fa4;
/* rgb */ color: rgb(66, 143, 164);
/* oklch */ color: oklch(61.0% 0.082 218.3);

Tailwind

colors: {
  custom: {
    50: '#80b0bf',
    500: '#428fa4',
    950: '#000000',
  },
}

SCSS

$custom: #428fa4;
$custom-light: #80b0bf;
$custom-dark: #000000;

JSON

{
  "hex": "#428fa4",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 164
  },
  "hsl": {
    "h": 192.857,
    "s": 42.609,
    "l": 45.098
  },
  "oklch": {
    "l": 0.61006,
    "c": 0.08164,
    "h": 218.3
  },
  "luminance": 0.23484
}

Semantic roles & 50–950 ramp

primary

#428FA4

secondary

#BD9185

accent

#7055D2

background

#F8FAFB

surface

#EFF4F7

border

#CACED0

text

#0B1012

muted

#7C7F81

Preview Lab

Preview with #428FA4

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

Preview Lab → · Contrast checker → · Palette generator →