#428FDD#428FDD

#428FDD is a light, vivid cyan. Relative luminance 0.260; OKLCH L 63.8% C 0.140 H 251.2°. Best body text is #000000 at 6.20:1 contrast (WCAG AA passes).

Color values

HEX	#428FDD
RGB	rgb(66, 143, 221)
HSL	hsl(210, 70%, 56%)
HSV	hsv(210, 70%, 87%)
CMYK	cmyk(70.1%, 35.3%, 0%, 13.3%)
CIE-LAB	lab(58.06, 1.64, -46.63)
CIE-LCH	lch(58.06, 46.66, 272.02°)
OKLab	oklab(63.8% -0.0451 -0.1325)
OKLCH	oklch(63.8% 0.14 251.2)
XYZ	xyz(25.1155, 26.0209, 72.0915)
Luminance	0.2602 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FDD #DD9042

analogous

#42DCDD #428FDD #4342DD

triadic

#428FDD #DD428F #8FDD42

tetradic

#428FDD #DD42DC #DD9042 #42DD43

square

#428FDD #DD42DC #DD9042 #42DD43

split-complementary

#428FDD #DD4342 #DCDD42

monochromatic

#19528C #2270BF #428FDD #76AEE6 #AACCF0

Accessibility & contrast

On white

3.38

#428FDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.20

#428FDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FDD

6.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FDD	#FFFFFF	#000000	##000000
##428FDD	1.00	3.38	6.20	6.20
#FFFFFF	3.38	1.00	21.00	21.00
#000000	6.20	21.00	1.00	1.00
##000000	6.20	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6C94E0

Deuteranopia (green-blind)

#5585DB

Tritanopia (blue-blind)

#00A1AC

Achromatopsia (no color)

#8C8C8C

Design tokens & code

CSS

--color: #428fdd;
/* rgb */ color: rgb(66, 143, 221);
/* oklch */ color: oklch(63.8% 0.140 251.2);

Tailwind

colors: {
  custom: {
    50: '#88afe8',
    500: '#428fdd',
    950: '#000000',
  },
}

SCSS

$custom: #428fdd;
$custom-light: #88afe8;
$custom-dark: #000000;

JSON

{
  "hex": "#428fdd",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 221
  },
  "hsl": {
    "h": 210.194,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.638,
    "c": 0.13997,
    "h": 251.2
  },
  "luminance": 0.26024
}

Semantic roles & 50–950 ramp

primary

#428FDD

secondary

#DDBE9D

accent

#943BEC

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428FDD

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

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