#428CCF#428CCF

#428CCF is a light, vivid cyan. Relative luminance 0.244; OKLCH L 62.4% C 0.126 H 248.5°. Best body text is #000000 at 5.88:1 contrast (WCAG AA passes).

Color values

HEX	#428CCF
RGB	rgb(66, 140, 207)
HSL	hsl(209, 59%, 54%)
HSV	hsv(209, 68%, 81%)
CMYK	cmyk(68.1%, 32.4%, 0%, 18.8%)
CIE-LAB	lab(56.50, -1.46, -41.23)
CIE-LCH	lch(56.50, 41.26, 267.97°)
OKLab	oklab(62.35% -0.046 -0.1168)
OKLCH	oklch(62.35% 0.126 248.5)
XYZ	xyz(22.8831, 24.4170, 62.5264)
Luminance	0.2442 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CCF #CF8542

analogous

#42CFCC #428CCF #4245CF

triadic

#428CCF #CF428C #8CCF42

tetradic

#428CCF #CC42CF #CF8542 #45CF42

square

#428CCF #CC42CF #CF8542 #45CF42

split-complementary

#428CCF #CF4245 #CFCC42

monochromatic

#1F4E78 #2B6DA9 #428CCF #73AADB #A4C7E8

Accessibility & contrast

On white

3.57

#428CCF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.88

#428CCF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CCF

5.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CCF	#FFFFFF	#000000	##000000
##428CCF	1.00	3.57	5.88	5.88
#FFFFFF	3.57	1.00	21.00	21.00
#000000	5.88	21.00	1.00	1.00
##000000	5.88	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6E8FD2

Deuteranopia (green-blind)

#5B81CE

Tritanopia (blue-blind)

#009CA4

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428ccf;
/* rgb */ color: rgb(66, 140, 207);
/* oklch */ color: oklch(62.4% 0.126 248.5);

Tailwind

colors: {
  custom: {
    50: '#85adde',
    500: '#428ccf',
    950: '#000000',
  },
}

SCSS

$custom: #428ccf;
$custom-light: #85adde;
$custom-dark: #000000;

JSON

{
  "hex": "#428ccf",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 207
  },
  "hsl": {
    "h": 208.511,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.62353,
    "c": 0.12552,
    "h": 248.5
  },
  "luminance": 0.24419
}

Semantic roles & 50–950 ramp

primary

#428CCF

secondary

#D5B598

accent

#9045E3

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428CCF

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

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