#428FB0#428FB0

#428FB0 is a mid, moderate cyan. Relative luminance 0.239; OKLCH L 61.5% C 0.090 H 228.9°. Best body text is #000000 at 5.79:1 contrast (WCAG AA passes).

Color values

HEX	#428FB0
RGB	rgb(66, 143, 176)
HSL	hsl(198, 45%, 47%)
HSV	hsv(198, 63%, 69%)
CMYK	cmyk(62.5%, 18.7%, 0%, 31%)
CIE-LAB	lab(56.02, -13.53, -24.40)
CIE-LCH	lch(56.02, 27.90, 240.98°)
OKLab	oklab(61.52% -0.0594 -0.0681)
OKLCH	oklch(61.52% 0.09 228.9)
XYZ	xyz(19.9026, 23.9358, 44.6371)
Luminance	0.2394 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FB0 #B06342

analogous

#42B09A #428FB0 #4258B0

triadic

#428FB0 #B0428F #8FB042

tetradic

#428FB0 #9A42B0 #B06342 #58B042

square

#428FB0 #9A42B0 #B06342 #58B042

split-complementary

#428FB0 #B04258 #B09A42

monochromatic

#214757 #316B83 #428FB0 #69AAC7 #95C3D7

Accessibility & contrast

On white

3.63

#428FB0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.79

#428FB0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FB0

5.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FB0	#FFFFFF	#000000	##000000
##428FB0	1.00	3.63	5.79	5.79
#FFFFFF	3.63	1.00	21.00	21.00
#000000	5.79	21.00	1.00	1.00
##000000	5.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7E8DB2

Deuteranopia (green-blind)

#6E81B0

Tritanopia (blue-blind)

#00989A

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428fb0;
/* rgb */ color: rgb(66, 143, 176);
/* oklch */ color: oklch(61.5% 0.090 228.9);

Tailwind

colors: {
  custom: {
    50: '#81afc7',
    500: '#428fb0',
    950: '#000000',
  },
}

SCSS

$custom: #428fb0;
$custom-light: #81afc7;
$custom-dark: #000000;

JSON

{
  "hex": "#428fb0",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 176
  },
  "hsl": {
    "h": 198,
    "s": 45.455,
    "l": 47.451
  },
  "oklch": {
    "l": 0.61524,
    "c": 0.09036,
    "h": 228.9
  },
  "luminance": 0.23938
}

Semantic roles & 50–950 ramp

primary

#428FB0

secondary

#C39C8B

accent

#7A53D5

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428FB0

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

Preview Lab → · Contrast checker → · Palette generator →