#428CDD#428CDD

#428CDD is a light, vivid cyan. Relative luminance 0.251; OKLCH L 63.1% C 0.143 H 252.8°. Best body text is #000000 at 6.03:1 contrast (WCAG AA passes).

Color values

HEX	#428CDD
RGB	rgb(66, 140, 221)
HSL	hsl(211, 70%, 56%)
HSV	hsv(211, 70%, 87%)
CMYK	cmyk(70.1%, 36.7%, 0%, 13.3%)
CIE-LAB	lab(57.20, 3.41, -47.98)
CIE-LCH	lch(57.20, 48.10, 274.07°)
OKLab	oklab(63.13% -0.0423 -0.1365)
OKLCH	oklch(63.13% 0.143 252.8)
XYZ	xyz(24.6712, 25.1322, 71.9434)
Luminance	0.2514 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CDD #DD9342

analogous

#42DADD #428CDD #4642DD

triadic

#428CDD #DD428C #8CDD42

tetradic

#428CDD #DD42DA #DD9342 #42DD46

square

#428CDD #DD42DA #DD9342 #42DD46

split-complementary

#428CDD #DD4642 #DADD42

monochromatic

#19508C #226DBF #428CDD #76ACE6 #AACBF0

Accessibility & contrast

On white

3.48

#428CDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.03

#428CDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CDD

6.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CDD	#FFFFFF	#000000	##000000
##428CDD	1.00	3.48	6.03	6.03
#FFFFFF	3.48	1.00	21.00	21.00
#000000	6.03	21.00	1.00	1.00
##000000	6.03	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6791E0

Deuteranopia (green-blind)

#5083DB

Tritanopia (blue-blind)

#009FAA

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428cdd;
/* rgb */ color: rgb(66, 140, 221);
/* oklch */ color: oklch(63.1% 0.143 252.8);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#428cdd",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 221
  },
  "hsl": {
    "h": 211.355,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.63132,
    "c": 0.14291,
    "h": 252.8
  },
  "luminance": 0.25135
}

Semantic roles & 50–950 ramp

primary

#428CDD

secondary

#DDBF9D

accent

#983BEC

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428CDD

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

Preview Lab → · Contrast checker → · Palette generator →