#428FB1#428FB1

#428FB1 is a mid, moderate cyan. Relative luminance 0.240; OKLCH L 61.6% C 0.091 H 229.7°. Best body text is #000000 at 5.80:1 contrast (WCAG AA passes).

Color values

HEX	#428FB1
RGB	rgb(66, 143, 177)
HSL	hsl(198, 46%, 48%)
HSV	hsv(198, 63%, 69%)
CMYK	cmyk(62.7%, 19.2%, 0%, 30.6%)
CIE-LAB	lab(56.06, -13.21, -24.90)
CIE-LCH	lch(56.06, 28.19, 242.05°)
OKLab	oklab(61.57% -0.059 -0.0696)
OKLCH	oklch(61.57% 0.091 229.7)
XYZ	xyz(20.0019, 23.9755, 45.1601)
Luminance	0.2398 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FB1 #B16442

analogous

#42B19B #428FB1 #4258B1

triadic

#428FB1 #B1428F #8FB142

tetradic

#428FB1 #9B42B1 #B16442 #58B142

square

#428FB1 #9B42B1 #B16442 #58B142

split-complementary

#428FB1 #B14258 #B19B42

monochromatic

#214758 #316B84 #428FB1 #69AAC7 #96C3D8

Accessibility & contrast

On white

3.62

#428FB1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.80

#428FB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FB1

5.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FB1	#FFFFFF	#000000	##000000
##428FB1	1.00	3.62	5.80	5.80
#FFFFFF	3.62	1.00	21.00	21.00
#000000	5.80	21.00	1.00	1.00
##000000	5.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7E8DB3

Deuteranopia (green-blind)

#6E81B1

Tritanopia (blue-blind)

#00999A

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428fb1;
/* rgb */ color: rgb(66, 143, 177);
/* oklch */ color: oklch(61.6% 0.091 229.7);

Tailwind

colors: {
  custom: {
    50: '#81afc8',
    500: '#428fb1',
    950: '#000000',
  },
}

SCSS

$custom: #428fb1;
$custom-light: #81afc8;
$custom-dark: #000000;

JSON

{
  "hex": "#428fb1",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 177
  },
  "hsl": {
    "h": 198.378,
    "s": 45.679,
    "l": 47.647
  },
  "oklch": {
    "l": 0.61569,
    "c": 0.09121,
    "h": 229.7
  },
  "luminance": 0.23977
}

Semantic roles & 50–950 ramp

primary

#428FB1

secondary

#C39D8B

accent

#7B52D5

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428FB1

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

Preview Lab → · Contrast checker → · Palette generator →