#428FB2#428FB2

#428FB2 is a mid, moderate cyan. Relative luminance 0.240; OKLCH L 61.6% C 0.092 H 230.5°. Best body text is #000000 at 5.80:1 contrast (WCAG AA passes).

Color values

HEX	#428FB2
RGB	rgb(66, 143, 178)
HSL	hsl(199, 46%, 48%)
HSV	hsv(199, 63%, 70%)
CMYK	cmyk(62.9%, 19.7%, 0%, 30.2%)
CIE-LAB	lab(56.10, -12.89, -25.41)
CIE-LCH	lch(56.10, 28.50, 243.10°)
OKLab	oklab(61.61% -0.0586 -0.071)
OKLCH	oklch(61.61% 0.092 230.5)
XYZ	xyz(20.1020, 24.0155, 45.6869)
Luminance	0.2402 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FB2 #B26542

analogous

#42B29D #428FB2 #4257B2

triadic

#428FB2 #B2428F #8FB242

tetradic

#428FB2 #9D42B2 #B26542 #57B242

square

#428FB2 #9D42B2 #B26542 #57B242

split-complementary

#428FB2 #B24257 #B29D42

monochromatic

#214759 #316B85 #428FB2 #6AAAC8 #96C4D8

Accessibility & contrast

On white

3.62

#428FB2 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.80

#428FB2 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FB2

5.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FB2	#FFFFFF	#000000	##000000
##428FB2	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)

#7D8DB4

Deuteranopia (green-blind)

#6E81B2

Tritanopia (blue-blind)

#00999B

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428fb2;
/* rgb */ color: rgb(66, 143, 178);
/* oklch */ color: oklch(61.6% 0.092 230.5);

Tailwind

colors: {
  custom: {
    50: '#81afc9',
    500: '#428fb2',
    950: '#000000',
  },
}

SCSS

$custom: #428fb2;
$custom-light: #81afc9;
$custom-dark: #000000;

JSON

{
  "hex": "#428fb2",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 178
  },
  "hsl": {
    "h": 198.75,
    "s": 45.902,
    "l": 47.843
  },
  "oklch": {
    "l": 0.61614,
    "c": 0.0921,
    "h": 230.5
  },
  "luminance": 0.24018
}

Semantic roles & 50–950 ramp

primary

#428FB2

secondary

#C49D8C

accent

#7B52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428FB2

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

Preview Lab → · Contrast checker → · Palette generator →