#428DDD#428DDD

#428DDD is a light, vivid cyan. Relative luminance 0.254; OKLCH L 63.4% C 0.142 H 252.3°. Best body text is #000000 at 6.09:1 contrast (WCAG AA passes).

Color values

HEX	#428DDD
RGB	rgb(66, 141, 221)
HSL	hsl(211, 70%, 56%)
HSV	hsv(211, 70%, 87%)
CMYK	cmyk(70.1%, 36.2%, 0%, 13.3%)
CIE-LAB	lab(57.49, 2.82, -47.53)
CIE-LCH	lch(57.49, 47.62, 273.40°)
OKLab	oklab(63.35% -0.0432 -0.1352)
OKLCH	oklch(63.35% 0.142 252.3)
XYZ	xyz(24.8179, 25.4258, 71.9923)
Luminance	0.2543 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DDD #DD9242

analogous

#42DBDD #428DDD #4542DD

triadic

#428DDD #DD428D #8DDD42

tetradic

#428DDD #DD42DB #DD9242 #42DD45

square

#428DDD #DD42DB #DD9242 #42DD45

split-complementary

#428DDD #DD4542 #DBDD42

monochromatic

#19508C #226EBF #428DDD #76ACE6 #AACCF0

Accessibility & contrast

On white

3.45

#428DDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.09

#428DDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DDD

6.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DDD	#FFFFFF	#000000	##000000
##428DDD	1.00	3.45	6.09	6.09
#FFFFFF	3.45	1.00	21.00	21.00
#000000	6.09	21.00	1.00	1.00
##000000	6.09	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6992E0

Deuteranopia (green-blind)

#5283DB

Tritanopia (blue-blind)

#00A0AA

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428ddd;
/* rgb */ color: rgb(66, 141, 221);
/* oklch */ color: oklch(63.4% 0.142 252.3);

Tailwind

colors: {
  custom: {
    50: '#88ade8',
    500: '#428ddd',
    950: '#000000',
  },
}

SCSS

$custom: #428ddd;
$custom-light: #88ade8;
$custom-dark: #000000;

JSON

{
  "hex": "#428ddd",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 221
  },
  "hsl": {
    "h": 210.968,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.63354,
    "c": 0.14192,
    "h": 252.3
  },
  "luminance": 0.25428
}

Semantic roles & 50–950 ramp

primary

#428DDD

secondary

#DDBE9D

accent

#973BEC

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428DDD

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

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