#428DB4#428DB4

#428DB4 is a mid, moderate cyan. Relative luminance 0.235; OKLCH L 61.2% C 0.095 H 234.0°. Best body text is #000000 at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#428DB4
RGB	rgb(66, 141, 180)
HSL	hsl(201, 46%, 48%)
HSV	hsv(201, 63%, 71%)
CMYK	cmyk(63.3%, 21.7%, 0%, 29.4%)
CIE-LAB	lab(55.59, -11.13, -27.36)
CIE-LCH	lch(55.59, 29.53, 247.86°)
OKLab	oklab(61.23% -0.0557 -0.0766)
OKLCH	oklch(61.23% 0.095 234)
XYZ	xyz(20.0067, 23.5013, 46.6530)
Luminance	0.2350 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DB4 #B46942

analogous

#42B4A2 #428DB4 #4254B4

triadic

#428DB4 #B4428D #8DB442

tetradic

#428DB4 #A242B4 #B46942 #54B442

square

#428DB4 #A242B4 #B46942 #54B442

split-complementary

#428DB4 #B44254 #B4A242

monochromatic

#21475A #326A87 #428DB4 #6BA8C9 #97C3D9

Accessibility & contrast

On white

3.68

#428DB4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.70

#428DB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DB4

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DB4	#FFFFFF	#000000	##000000
##428DB4	1.00	3.68	5.70	5.70
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.70	21.00	1.00	1.00
##000000	5.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7A8CB6

Deuteranopia (green-blind)

#6A80B3

Tritanopia (blue-blind)

#00979A

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428db4;
/* rgb */ color: rgb(66, 141, 180);
/* oklch */ color: oklch(61.2% 0.095 234.0);

Tailwind

colors: {
  custom: {
    50: '#82aeca',
    500: '#428db4',
    950: '#000000',
  },
}

SCSS

$custom: #428db4;
$custom-light: #82aeca;
$custom-dark: #000000;

JSON

{
  "hex": "#428db4",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 180
  },
  "hsl": {
    "h": 200.526,
    "s": 46.341,
    "l": 48.235
  },
  "oklch": {
    "l": 0.61228,
    "c": 0.09472,
    "h": 234
  },
  "luminance": 0.23503
}

Semantic roles & 50–950 ramp

primary

#428DB4

secondary

#C5A08D

accent

#7F52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428DB4

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

Preview Lab → · Contrast checker → · Palette generator →