#428FB4#428FB4

#428FB4 is a mid, moderate cyan. Relative luminance 0.241; OKLCH L 61.7% C 0.094 H 231.9°. Best body text is #000000 at 5.82:1 contrast (WCAG AA passes).

Color values

HEX	#428FB4
RGB	rgb(66, 143, 180)
HSL	hsl(199, 46%, 48%)
HSV	hsv(199, 63%, 71%)
CMYK	cmyk(63.3%, 20.6%, 0%, 29.4%)
CIE-LAB	lab(56.18, -12.24, -26.43)
CIE-LCH	lch(56.18, 29.13, 245.14°)
OKLab	oklab(61.71% -0.0579 -0.0739)
OKLCH	oklch(61.71% 0.094 231.9)
XYZ	xyz(20.3042, 24.0964, 46.7522)
Luminance	0.2410 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FB4 #B46742

analogous

#42B4A0 #428FB4 #4256B4

triadic

#428FB4 #B4428F #8FB442

tetradic

#428FB4 #A042B4 #B46742 #56B442

square

#428FB4 #A042B4 #B46742 #56B442

split-complementary

#428FB4 #B44256 #B4A042

monochromatic

#21485A #326B87 #428FB4 #6BAAC9 #97C4D9

Accessibility & contrast

On white

3.61

#428FB4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.82

#428FB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FB4

5.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FB4	#FFFFFF	#000000	##000000
##428FB4	1.00	3.61	5.82	5.82
#FFFFFF	3.61	1.00	21.00	21.00
#000000	5.82	21.00	1.00	1.00
##000000	5.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7D8DB6

Deuteranopia (green-blind)

#6D82B3

Tritanopia (blue-blind)

#00999B

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428fb4;
/* rgb */ color: rgb(66, 143, 180);
/* oklch */ color: oklch(61.7% 0.094 231.9);

Tailwind

colors: {
  custom: {
    50: '#82afca',
    500: '#428fb4',
    950: '#000000',
  },
}

SCSS

$custom: #428fb4;
$custom-light: #82afca;
$custom-dark: #000000;

JSON

{
  "hex": "#428fb4",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 180
  },
  "hsl": {
    "h": 199.474,
    "s": 46.341,
    "l": 48.235
  },
  "oklch": {
    "l": 0.61705,
    "c": 0.0939,
    "h": 231.9
  },
  "luminance": 0.24098
}

Semantic roles & 50–950 ramp

primary

#428FB4

secondary

#C59F8D

accent

#7D52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428FB4

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

Preview Lab → · Contrast checker → · Palette generator →