#428FE9#428FE9

#428FE9 is a light, vivid cyan. Relative luminance 0.267; OKLCH L 64.5% C 0.155 H 254.2°. Best body text is #000000 at 6.34:1 contrast (WCAG AA passes).

Color values

HEX	#428FE9
RGB	rgb(66, 143, 233)
HSL	hsl(212, 79%, 59%)
HSV	hsv(212, 72%, 91%)
CMYK	cmyk(71.7%, 38.6%, 0%, 8.6%)
CIE-LAB	lab(58.68, 5.86, -52.32)
CIE-LCH	lch(58.68, 52.65, 276.39°)
OKLab	oklab(64.49% -0.0422 -0.1492)
OKLCH	oklch(64.49% 0.155 254.2)
XYZ	xyz(26.7718, 26.6834, 80.8145)
Luminance	0.2669 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FE9 #E99C42

analogous

#42E3E9 #428FE9 #4842E9

triadic

#428FE9 #E9428F #8FE942

tetradic

#428FE9 #E942E3 #E99C42 #42E948

square

#428FE9 #E942E3 #E99C42 #42E948

split-complementary

#428FE9 #E94842 #E3E942

monochromatic

#12539E #1970D5 #428FE9 #79AFEF #B0D0F6

Accessibility & contrast

On white

3.31

#428FE9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.34

#428FE9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FE9

6.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FE9	#FFFFFF	#000000	##000000
##428FE9	1.00	3.31	6.34	6.34
#FFFFFF	3.31	1.00	21.00	21.00
#000000	6.34	21.00	1.00	1.00
##000000	6.34	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6596ED

Deuteranopia (green-blind)

#4B86E7

Tritanopia (blue-blind)

#00A4B1

Achromatopsia (no color)

#8D8D8D

Design tokens & code

CSS

--color: #428fe9;
/* rgb */ color: rgb(66, 143, 233);
/* oklch */ color: oklch(64.5% 0.155 254.2);

Tailwind

colors: {
  custom: {
    50: '#8aaff0',
    500: '#428fe9',
    950: '#000000',
  },
}

SCSS

$custom: #428fe9;
$custom-light: #8aaff0;
$custom-dark: #000000;

JSON

{
  "hex": "#428fe9",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 233
  },
  "hsl": {
    "h": 212.335,
    "s": 79.147,
    "l": 58.627
  },
  "oklch": {
    "l": 0.6449,
    "c": 0.15503,
    "h": 254.2
  },
  "luminance": 0.26686
}

Semantic roles & 50–950 ramp

primary

#428FE9

secondary

#E4C6A2

accent

#9C32F6

background

#F9FAFE

surface

#F1F4FD

border

#CBCED5

text

#0D1017

muted

#7E7F85

Preview Lab

Preview with #428FE9

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

Preview Lab → · Contrast checker → · Palette generator →