#428FD3#428FD3

#428FD3 is a light, vivid cyan. Relative luminance 0.255; OKLCH L 63.2% C 0.128 H 248.0°. Best body text is #000000 at 6.10:1 contrast (WCAG AA passes).

Color values

HEX	#428FD3
RGB	rgb(66, 143, 211)
HSL	hsl(208, 62%, 54%)
HSV	hsv(208, 69%, 83%)
CMYK	cmyk(68.7%, 32.2%, 0%, 17.3%)
CIE-LAB	lab(57.56, -1.83, -41.81)
CIE-LCH	lch(57.56, 41.85, 267.49°)
OKLab	oklab(63.25% -0.0478 -0.1184)
OKLCH	oklch(63.25% 0.128 248)
XYZ	xyz(23.8227, 25.5038, 65.2826)
Luminance	0.2551 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FD3 #D38642

analogous

#42D3CF #428FD3 #4247D3

triadic

#428FD3 #D3428F #8FD342

tetradic

#428FD3 #CF42D3 #D38642 #47D342

square

#428FD3 #CF42D3 #D38642 #47D342

split-complementary

#428FD3 #D34247 #D3CF42

monochromatic

#1D507D #2970AF #428FD3 #74ACDF #A5CAEA

Accessibility & contrast

On white

3.44

#428FD3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.10

#428FD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FD3

6.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FD3	#FFFFFF	#000000	##000000
##428FD3	1.00	3.44	6.10	6.10
#FFFFFF	3.44	1.00	21.00	21.00
#000000	6.10	21.00	1.00	1.00
##000000	6.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7192D6

Deuteranopia (green-blind)

#5C84D2

Tritanopia (blue-blind)

#009FA7

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428fd3;
/* rgb */ color: rgb(66, 143, 211);
/* oklch */ color: oklch(63.2% 0.128 248.0);

Tailwind

colors: {
  custom: {
    50: '#86afe1',
    500: '#428fd3',
    950: '#000000',
  },
}

SCSS

$custom: #428fd3;
$custom-light: #86afe1;
$custom-dark: #000000;

JSON

{
  "hex": "#428fd3",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 211
  },
  "hsl": {
    "h": 208.138,
    "s": 62.232,
    "l": 54.314
  },
  "oklch": {
    "l": 0.6325,
    "c": 0.12773,
    "h": 248
  },
  "luminance": 0.25506
}

Semantic roles & 50–950 ramp

primary

#428FD3

secondary

#D7B69A

accent

#8F42E5

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428FD3

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

Preview Lab → · Contrast checker → · Palette generator →