#428ED3#428ED3

#428ED3 is a light, vivid cyan. Relative luminance 0.252; OKLCH L 63.0% C 0.129 H 248.6°. Best body text is #000000 at 6.04:1 contrast (WCAG AA passes).

Color values

HEX	#428ED3
RGB	rgb(66, 142, 211)
HSL	hsl(209, 62%, 54%)
HSV	hsv(209, 69%, 83%)
CMYK	cmyk(68.7%, 32.7%, 0%, 17.3%)
CIE-LAB	lab(57.27, -1.25, -42.27)
CIE-LCH	lch(57.27, 42.29, 268.31°)
OKLab	oklab(63.02% -0.0468 -0.1198)
OKLCH	oklch(63.02% 0.129 248.6)
XYZ	xyz(23.6732, 25.2049, 65.2328)
Luminance	0.2521 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428ED3 #D38742

analogous

#42D3D0 #428ED3 #4246D3

triadic

#428ED3 #D3428E #8ED342

tetradic

#428ED3 #D042D3 #D38742 #46D342

square

#428ED3 #D042D3 #D38742 #46D342

split-complementary

#428ED3 #D34246 #D3D042

monochromatic

#1D507D #296FAF #428ED3 #74ACDF #A5C9EA

Accessibility & contrast

On white

3.48

#428ED3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.04

#428ED3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428ED3

6.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428ED3	#FFFFFF	#000000	##000000
##428ED3	1.00	3.48	6.04	6.04
#FFFFFF	3.48	1.00	21.00	21.00
#000000	6.04	21.00	1.00	1.00
##000000	6.04	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6F91D6

Deuteranopia (green-blind)

#5B83D2

Tritanopia (blue-blind)

#009EA7

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428ed3;
/* rgb */ color: rgb(66, 142, 211);
/* oklch */ color: oklch(63.0% 0.129 248.6);

Tailwind

colors: {
  custom: {
    50: '#86aee1',
    500: '#428ed3',
    950: '#000000',
  },
}

SCSS

$custom: #428ed3;
$custom-light: #86aee1;
$custom-dark: #000000;

JSON

{
  "hex": "#428ed3",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 211
  },
  "hsl": {
    "h": 208.552,
    "s": 62.232,
    "l": 54.314
  },
  "oklch": {
    "l": 0.63023,
    "c": 0.12861,
    "h": 248.6
  },
  "luminance": 0.25207
}

Semantic roles & 50–950 ramp

primary

#428ED3

secondary

#D7B79A

accent

#9042E5

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428ED3

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

Preview Lab → · Contrast checker → · Palette generator →