#428CE9#428CE9

#428CE9 is a light, vivid cyan. Relative luminance 0.258; OKLCH L 63.8% C 0.158 H 255.5°. Best body text is #000000 at 6.16:1 contrast (WCAG AA passes).

Color values

HEX	#428CE9
RGB	rgb(66, 140, 233)
HSL	hsl(213, 79%, 59%)
HSV	hsv(213, 72%, 91%)
CMYK	cmyk(71.7%, 39.9%, 0%, 8.6%)
CIE-LAB	lab(57.84, 7.65, -53.66)
CIE-LCH	lch(57.84, 54.20, 278.11°)
OKLab	oklab(63.84% -0.0395 -0.1531)
OKLCH	oklch(63.84% 0.158 255.5)
XYZ	xyz(26.3274, 25.7947, 80.6664)
Luminance	0.2580 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CE9 #E99F42

analogous

#42E0E9 #428CE9 #4B42E9

triadic

#428CE9 #E9428C #8CE942

tetradic

#428CE9 #E942E0 #E99F42 #42E94B

square

#428CE9 #E942E0 #E99F42 #42E94B

split-complementary

#428CE9 #E94B42 #E0E942

monochromatic

#12509E #196CD5 #428CE9 #79ADEF #B0CFF6

Accessibility & contrast

On white

3.41

#428CE9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.16

#428CE9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CE9

6.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CE9	#FFFFFF	#000000	##000000
##428CE9	1.00	3.41	6.16	6.16
#FFFFFF	3.41	1.00	21.00	21.00
#000000	6.16	21.00	1.00	1.00
##000000	6.16	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6093ED

Deuteranopia (green-blind)

#4584E7

Tritanopia (blue-blind)

#00A2AF

Achromatopsia (no color)

#8B8B8B

Design tokens & code

CSS

--color: #428ce9;
/* rgb */ color: rgb(66, 140, 233);
/* oklch */ color: oklch(63.8% 0.158 255.5);

Tailwind

colors: {
  custom: {
    50: '#8aadf0',
    500: '#428ce9',
    950: '#000000',
  },
}

SCSS

$custom: #428ce9;
$custom-light: #8aadf0;
$custom-dark: #000000;

JSON

{
  "hex": "#428ce9",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 233
  },
  "hsl": {
    "h": 213.413,
    "s": 79.147,
    "l": 58.627
  },
  "oklch": {
    "l": 0.63837,
    "c": 0.15815,
    "h": 255.5
  },
  "luminance": 0.25798
}

Semantic roles & 50–950 ramp

primary

#428CE9

secondary

#E4C7A2

accent

#9F32F6

background

#F9FAFE

surface

#F1F4FD

border

#CBCED5

text

#0D1017

muted

#7E7F85

Preview Lab

Preview with #428CE9

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

Preview Lab → · Contrast checker → · Palette generator →