#428FDC#428FDC

#428FDC is a light, vivid cyan. Relative luminance 0.260; OKLCH L 63.7% C 0.139 H 250.9°. Best body text is #000000 at 6.19:1 contrast (WCAG AA passes).

Color values

HEX	#428FDC
RGB	rgb(66, 143, 220)
HSL	hsl(210, 69%, 56%)
HSV	hsv(210, 70%, 86%)
CMYK	cmyk(70%, 35%, 0%, 13.7%)
CIE-LAB	lab(58.01, 1.29, -46.15)
CIE-LCH	lch(58.01, 46.17, 271.60°)
OKLab	oklab(63.74% -0.0454 -0.1311)
OKLCH	oklch(63.74% 0.139 250.9)
XYZ	xyz(24.9827, 25.9678, 71.3919)
Luminance	0.2597 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FDC #DC8F42

analogous

#42DCDC #428FDC #4242DC

triadic

#428FDC #DC428F #8FDC42

tetradic

#428FDC #DC42DC #DC8F42 #42DC42

square

#428FDC #DC42DC #DC8F42 #42DC42

split-complementary

#428FDC #DC4242 #DCDC42

monochromatic

#1A528A #2370BE #428FDC #76AEE6 #A9CCEF

Accessibility & contrast

On white

3.39

#428FDC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.19

#428FDC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FDC

6.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FDC	#FFFFFF	#000000	##000000
##428FDC	1.00	3.39	6.19	6.19
#FFFFFF	3.39	1.00	21.00	21.00
#000000	6.19	21.00	1.00	1.00
##000000	6.19	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6C93DF

Deuteranopia (green-blind)

#5685DA

Tritanopia (blue-blind)

#00A1AB

Achromatopsia (no color)

#8B8B8B

Design tokens & code

CSS

--color: #428fdc;
/* rgb */ color: rgb(66, 143, 220);
/* oklch */ color: oklch(63.7% 0.139 250.9);

Tailwind

colors: {
  custom: {
    50: '#88afe7',
    500: '#428fdc',
    950: '#000000',
  },
}

SCSS

$custom: #428fdc;
$custom-light: #88afe7;
$custom-dark: #000000;

JSON

{
  "hex": "#428fdc",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 220
  },
  "hsl": {
    "h": 210,
    "s": 68.75,
    "l": 56.078
  },
  "oklch": {
    "l": 0.63744,
    "c": 0.13873,
    "h": 250.9
  },
  "luminance": 0.2597
}

Semantic roles & 50–950 ramp

primary

#428FDC

secondary

#DDBD9D

accent

#943CEC

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428FDC

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

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