#428FB3#428FB3

#428FB3 is a mid, moderate cyan. Relative luminance 0.241; OKLCH L 61.7% C 0.093 H 231.2°. Best body text is #000000 at 5.81:1 contrast (WCAG AA passes).

Color values

HEX	#428FB3
RGB	rgb(66, 143, 179)
HSL	hsl(199, 46%, 48%)
HSV	hsv(199, 63%, 70%)
CMYK	cmyk(63.1%, 20.1%, 0%, 29.8%)
CIE-LAB	lab(56.14, -12.57, -25.92)
CIE-LCH	lch(56.14, 28.81, 244.13°)
OKLab	oklab(61.66% -0.0582 -0.0725)
OKLCH	oklch(61.66% 0.093 231.2)
XYZ	xyz(20.2027, 24.0558, 46.2176)
Luminance	0.2406 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FB3 #B36642

analogous

#42B39E #428FB3 #4257B3

triadic

#428FB3 #B3428F #8FB342

tetradic

#428FB3 #9E42B3 #B36642 #57B342

square

#428FB3 #9E42B3 #B36642 #57B342

split-complementary

#428FB3 #B34257 #B39E42

monochromatic

#21485A #326B86 #428FB3 #6AAAC8 #97C4D9

Accessibility & contrast

On white

3.61

#428FB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.81

#428FB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FB3

5.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FB3	#FFFFFF	#000000	##000000
##428FB3	1.00	3.61	5.81	5.81
#FFFFFF	3.61	1.00	21.00	21.00
#000000	5.81	21.00	1.00	1.00
##000000	5.81	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7D8DB5

Deuteranopia (green-blind)

#6D81B2

Tritanopia (blue-blind)

#00999B

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428fb3;
/* rgb */ color: rgb(66, 143, 179);
/* oklch */ color: oklch(61.7% 0.093 231.2);

Tailwind

colors: {
  custom: {
    50: '#82afc9',
    500: '#428fb3',
    950: '#000000',
  },
}

SCSS

$custom: #428fb3;
$custom-light: #82afc9;
$custom-dark: #000000;

JSON

{
  "hex": "#428fb3",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 179
  },
  "hsl": {
    "h": 199.115,
    "s": 46.122,
    "l": 48.039
  },
  "oklch": {
    "l": 0.61659,
    "c": 0.09299,
    "h": 231.2
  },
  "luminance": 0.24058
}

Semantic roles & 50–950 ramp

primary

#428FB3

secondary

#C49E8C

accent

#7C52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428FB3

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

Preview Lab → · Contrast checker → · Palette generator →