#428BD3#428BD3

#428BD3 is a light, vivid cyan. Relative luminance 0.243; OKLCH L 62.3% C 0.131 H 250.5°. Best body text is #000000 at 5.87:1 contrast (WCAG AA passes).

Color values

HEX	#428BD3
RGB	rgb(66, 139, 211)
HSL	hsl(210, 62%, 54%)
HSV	hsv(210, 69%, 83%)
CMYK	cmyk(68.7%, 34.1%, 0%, 17.3%)
CIE-LAB	lab(56.41, 0.51, -43.63)
CIE-LCH	lch(56.41, 43.63, 270.67°)
OKLab	oklab(62.34% -0.0439 -0.1238)
OKLCH	oklch(62.34% 0.131 250.5)
XYZ	xyz(23.2329, 24.3242, 65.0860)
Luminance	0.2433 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BD3 #D38A42

analogous

#42D3D3 #428BD3 #4243D3

triadic

#428BD3 #D3428B #8BD342

tetradic

#428BD3 #D342D3 #D38A42 #43D342

square

#428BD3 #D342D3 #D38A42 #43D342

split-complementary

#428BD3 #D34243 #D3D342

monochromatic

#1D4E7D #296CAF #428BD3 #74A9DF #A5C8EA

Accessibility & contrast

On white

3.58

#428BD3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.87

#428BD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BD3

5.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BD3	#FFFFFF	#000000	##000000
##428BD3	1.00	3.58	5.87	5.87
#FFFFFF	3.58	1.00	21.00	21.00
#000000	5.87	21.00	1.00	1.00
##000000	5.87	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6B8FD6

Deuteranopia (green-blind)

#5681D2

Tritanopia (blue-blind)

#009CA5

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428bd3;
/* rgb */ color: rgb(66, 139, 211);
/* oklch */ color: oklch(62.3% 0.131 250.5);

Tailwind

colors: {
  custom: {
    50: '#86ace1',
    500: '#428bd3',
    950: '#000000',
  },
}

SCSS

$custom: #428bd3;
$custom-light: #86ace1;
$custom-dark: #000000;

JSON

{
  "hex": "#428bd3",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 211
  },
  "hsl": {
    "h": 209.793,
    "s": 62.232,
    "l": 54.314
  },
  "oklch": {
    "l": 0.62345,
    "c": 0.13135,
    "h": 250.5
  },
  "luminance": 0.24327
}

Semantic roles & 50–950 ramp

primary

#428BD3

secondary

#D7B89A

accent

#9342E5

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BD3

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

Preview Lab → · Contrast checker → · Palette generator →