#428FD9#428FD9

#428FD9 is a light, vivid cyan. Relative luminance 0.258; OKLCH L 63.6% C 0.135 H 250.0°. Best body text is #000000 at 6.16:1 contrast (WCAG AA passes).

Color values

HEX	#428FD9
RGB	rgb(66, 143, 217)
HSL	hsl(209, 67%, 55%)
HSV	hsv(209, 70%, 85%)
CMYK	cmyk(69.6%, 34.1%, 0%, 14.9%)
CIE-LAB	lab(57.86, 0.25, -44.71)
CIE-LCH	lch(57.86, 44.71, 270.32°)
OKLab	oklab(63.58% -0.0461 -0.1269)
OKLCH	oklch(63.58% 0.135 250)
XYZ	xyz(24.5889, 25.8103, 69.3182)
Luminance	0.2581 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FD9 #D98C42

analogous

#42D9D8 #428FD9 #4243D9

triadic

#428FD9 #D9428F #8FD942

tetradic

#428FD9 #D842D9 #D98C42 #43D942

square

#428FD9 #D842D9 #D98C42 #43D942

split-complementary

#428FD9 #D94243 #D9D842

monochromatic

#1B5186 #2570B9 #428FD9 #75ADE3 #A8CBED

Accessibility & contrast

On white

3.41

#428FD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.16

#428FD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FD9

6.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FD9	#FFFFFF	#000000	##000000
##428FD9	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)

#6E93DC

Deuteranopia (green-blind)

#5885D8

Tritanopia (blue-blind)

#00A0AA

Achromatopsia (no color)

#8B8B8B

Design tokens & code

CSS

--color: #428fd9;
/* rgb */ color: rgb(66, 143, 217);
/* oklch */ color: oklch(63.6% 0.135 250.0);

Tailwind

colors: {
  custom: {
    50: '#87afe5',
    500: '#428fd9',
    950: '#000000',
  },
}

SCSS

$custom: #428fd9;
$custom-light: #87afe5;
$custom-dark: #000000;

JSON

{
  "hex": "#428fd9",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 217
  },
  "hsl": {
    "h": 209.404,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.63577,
    "c": 0.13503,
    "h": 250
  },
  "luminance": 0.25813
}

Semantic roles & 50–950 ramp

primary

#428FD9

secondary

#DBBB9C

accent

#923EE9

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0D1016

muted

#7D7F84

Preview Lab

Preview with #428FD9

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

Preview Lab → · Contrast checker → · Palette generator →