#428ED9#428ED9

#428ED9 is a light, vivid cyan. Relative luminance 0.255; OKLCH L 63.4% C 0.136 H 250.6°. Best body text is #000000 at 6.10:1 contrast (WCAG AA passes).

Color values

HEX	#428ED9
RGB	rgb(66, 142, 217)
HSL	hsl(210, 67%, 55%)
HSV	hsv(210, 70%, 85%)
CMYK	cmyk(69.6%, 34.6%, 0%, 14.9%)
CIE-LAB	lab(57.57, 0.83, -45.17)
CIE-LCH	lch(57.57, 45.17, 271.06°)
OKLab	oklab(63.35% -0.0452 -0.1282)
OKLCH	oklch(63.35% 0.136 250.6)
XYZ	xyz(24.4395, 25.5114, 69.2684)
Luminance	0.2551 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428ED9 #D98D42

analogous

#42D9D8 #428ED9 #4242D9

triadic

#428ED9 #D9428E #8ED942

tetradic

#428ED9 #D842D9 #D98D42 #42D942

square

#428ED9 #D842D9 #D98D42 #42D942

split-complementary

#428ED9 #D94242 #D9D842

monochromatic

#1B5186 #256FB9 #428ED9 #75ACE3 #A8CBED

Accessibility & contrast

On white

3.44

#428ED9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.10

#428ED9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428ED9

6.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428ED9	#FFFFFF	#000000	##000000
##428ED9	1.00	3.44	6.10	6.10
#FFFFFF	3.44	1.00	21.00	21.00
#000000	6.10	21.00	1.00	1.00
##000000	6.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6C92DC

Deuteranopia (green-blind)

#5784D8

Tritanopia (blue-blind)

#00A0A9

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428ed9;
/* rgb */ color: rgb(66, 142, 217);
/* oklch */ color: oklch(63.4% 0.136 250.6);

Tailwind

colors: {
  custom: {
    50: '#87aee5',
    500: '#428ed9',
    950: '#000000',
  },
}

SCSS

$custom: #428ed9;
$custom-light: #87aee5;
$custom-dark: #000000;

JSON

{
  "hex": "#428ed9",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 217
  },
  "hsl": {
    "h": 209.801,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.63352,
    "c": 0.13597,
    "h": 250.6
  },
  "luminance": 0.25514
}

Semantic roles & 50–950 ramp

primary

#428ED9

secondary

#DBBB9C

accent

#933EE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1016

muted

#7D7F84

Preview Lab

Preview with #428ED9

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

Preview Lab → · Contrast checker → · Palette generator →