#428ACF#428ACF

#428ACF is a mid, vivid cyan. Relative luminance 0.238; OKLCH L 61.9% C 0.127 H 249.8°. Best body text is #000000 at 5.77:1 contrast (WCAG AA passes).

Color values

HEX	#428ACF
RGB	rgb(66, 138, 207)
HSL	hsl(209, 59%, 54%)
HSV	hsv(209, 68%, 81%)
CMYK	cmyk(68.1%, 33.3%, 0%, 18.8%)
CIE-LAB	lab(55.92, -0.29, -42.14)
CIE-LCH	lch(55.92, 42.15, 269.61°)
OKLab	oklab(61.9% -0.044 -0.1195)
OKLCH	oklch(61.9% 0.127 249.8)
XYZ	xyz(22.5935, 23.8378, 62.4298)
Luminance	0.2384 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428ACF #CF8742

analogous

#42CFCE #428ACF #4243CF

triadic

#428ACF #CF428A #8ACF42

tetradic

#428ACF #CE42CF #CF8742 #43CF42

square

#428ACF #CE42CF #CF8742 #43CF42

split-complementary

#428ACF #CF4243 #CFCE42

monochromatic

#1F4C78 #2B6BA9 #428ACF #73A8DB #A4C6E8

Accessibility & contrast

On white

3.64

#428ACF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.77

#428ACF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428ACF

5.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428ACF	#FFFFFF	#000000	##000000
##428ACF	1.00	3.64	5.77	5.77
#FFFFFF	3.64	1.00	21.00	21.00
#000000	5.77	21.00	1.00	1.00
##000000	5.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6B8DD2

Deuteranopia (green-blind)

#5880CE

Tritanopia (blue-blind)

#009AA3

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428acf;
/* rgb */ color: rgb(66, 138, 207);
/* oklch */ color: oklch(61.9% 0.127 249.8);

Tailwind

colors: {
  custom: {
    50: '#85abde',
    500: '#428acf',
    950: '#000000',
  },
}

SCSS

$custom: #428acf;
$custom-light: #85abde;
$custom-dark: #000000;

JSON

{
  "hex": "#428acf",
  "rgb": {
    "r": 66,
    "g": 138,
    "b": 207
  },
  "hsl": {
    "h": 209.362,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.61899,
    "c": 0.12732,
    "h": 249.8
  },
  "luminance": 0.2384
}

Semantic roles & 50–950 ramp

primary

#428ACF

secondary

#D5B698

accent

#9245E3

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428ACF

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

Preview Lab → · Contrast checker → · Palette generator →