#428CDF#428CDF

#428CDF is a light, vivid cyan. Relative luminance 0.252; OKLCH L 63.2% C 0.145 H 253.3°. Best body text is #000000 at 6.05:1 contrast (WCAG AA passes).

Color values

HEX	#428CDF
RGB	rgb(66, 140, 223)
HSL	hsl(212, 71%, 57%)
HSV	hsv(212, 70%, 87%)
CMYK	cmyk(70.4%, 37.2%, 0%, 12.5%)
CIE-LAB	lab(57.31, 4.12, -48.94)
CIE-LCH	lch(57.31, 49.11, 274.81°)
OKLab	oklab(63.25% -0.0418 -0.1393)
OKLCH	oklch(63.25% 0.145 253.3)
XYZ	xyz(24.9392, 25.2394, 73.3551)
Luminance	0.2524 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CDF #DF9542

analogous

#42DADF #428CDF #4742DF

triadic

#428CDF #DF428C #8CDF42

tetradic

#428CDF #DF42DA #DF9542 #42DF47

square

#428CDF #DF42DA #DF9542 #42DF47

split-complementary

#428CDF #DF4742 #DADF42

monochromatic

#18508E #216DC3 #428CDF #76ACE8 #ABCCF1

Accessibility & contrast

On white

3.47

#428CDF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.05

#428CDF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CDF

6.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CDF	#FFFFFF	#000000	##000000
##428CDF	1.00	3.47	6.05	6.05
#FFFFFF	3.47	1.00	21.00	21.00
#000000	6.05	21.00	1.00	1.00
##000000	6.05	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6692E2

Deuteranopia (green-blind)

#4F83DD

Tritanopia (blue-blind)

#009FAB

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428cdf;
/* rgb */ color: rgb(66, 140, 223);
/* oklch */ color: oklch(63.2% 0.145 253.3);

Tailwind

colors: {
  custom: {
    50: '#88ade9',
    500: '#428cdf',
    950: '#000000',
  },
}

SCSS

$custom: #428cdf;
$custom-light: #88ade9;
$custom-dark: #000000;

JSON

{
  "hex": "#428cdf",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 223
  },
  "hsl": {
    "h": 211.72,
    "s": 71.041,
    "l": 56.667
  },
  "oklch": {
    "l": 0.63247,
    "c": 0.14543,
    "h": 253.3
  },
  "luminance": 0.25242
}

Semantic roles & 50–950 ramp

primary

#428CDF

secondary

#DFC09E

accent

#993AEE

background

#F9FAFE

surface

#F1F4FD

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428CDF

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

Preview Lab → · Contrast checker → · Palette generator →