#428ABB#428ABB

#428ABB is a mid, moderate cyan. Relative luminance 0.229; OKLCH L 60.9% C 0.104 H 241.1°. Best body text is #000000 at 5.58:1 contrast (WCAG AA passes).

Color values

HEX	#428ABB
RGB	rgb(66, 138, 187)
HSL	hsl(204, 48%, 50%)
HSV	hsv(204, 65%, 73%)
CMYK	cmyk(64.7%, 26.2%, 0%, 26.7%)
CIE-LAB	lab(54.99, -7.11, -32.27)
CIE-LCH	lch(54.99, 33.04, 257.57°)
OKLab	oklab(60.86% -0.0501 -0.0908)
OKLCH	oklch(60.86% 0.104 241.1)
XYZ	xyz(20.3015, 22.9210, 50.3584)
Luminance	0.2292 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428ABB #BB7342

analogous

#42BBB0 #428ABB #424DBB

triadic

#428ABB #BB428A #8ABB42

tetradic

#428ABB #B042BB #BB7342 #4DBB42

square

#428ABB #B042BB #BB7342 #4DBB42

split-complementary

#428ABB #BB424D #BBB042

monochromatic

#224761 #32698E #428ABB #6EA6CC #9CC2DC

Accessibility & contrast

On white

3.76

#428ABB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.58

#428ABB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428ABB

5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428ABB	#FFFFFF	#000000	##000000
##428ABB	1.00	3.76	5.58	5.58
#FFFFFF	3.76	1.00	21.00	21.00
#000000	5.58	21.00	1.00	1.00
##000000	5.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#748ABD

Deuteranopia (green-blind)

#637EBA

Tritanopia (blue-blind)

#00969B

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428abb;
/* rgb */ color: rgb(66, 138, 187);
/* oklch */ color: oklch(60.9% 0.104 241.1);

Tailwind

colors: {
  custom: {
    50: '#82accf',
    500: '#428abb',
    950: '#000000',
  },
}

SCSS

$custom: #428abb;
$custom-light: #82accf;
$custom-dark: #000000;

JSON

{
  "hex": "#428abb",
  "rgb": {
    "r": 66,
    "g": 138,
    "b": 187
  },
  "hsl": {
    "h": 204.298,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.60856,
    "c": 0.10368,
    "h": 241.1
  },
  "luminance": 0.22923
}

Semantic roles & 50–950 ramp

primary

#428ABB

secondary

#C8A791

accent

#8750D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428ABB

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

Preview Lab → · Contrast checker → · Palette generator →