#428FD1#428FD1

#428FD1 is a light, vivid cyan. Relative luminance 0.254; OKLCH L 63.1% C 0.125 H 247.3°. Best body text is #000000 at 6.08:1 contrast (WCAG AA passes).

Color values

HEX	#428FD1
RGB	rgb(66, 143, 209)
HSL	hsl(208, 61%, 54%)
HSV	hsv(208, 68%, 82%)
CMYK	cmyk(68.4%, 31.6%, 0%, 18%)
CIE-LAB	lab(57.47, -2.52, -40.84)
CIE-LCH	lch(57.47, 40.92, 266.47°)
OKLab	oklab(63.14% -0.0484 -0.1156)
OKLCH	oklch(63.14% 0.125 247.3)
XYZ	xyz(23.5735, 25.4041, 63.9704)
Luminance	0.2541 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FD1 #D18442

analogous

#42D1CB #428FD1 #4248D1

triadic

#428FD1 #D1428F #8FD142

tetradic

#428FD1 #CB42D1 #D18442 #48D142

square

#428FD1 #CB42D1 #D18442 #48D142

split-complementary

#428FD1 #D14248 #D1CB42

monochromatic

#1E507B #2A70AC #428FD1 #73ACDD #A4C9E9

Accessibility & contrast

On white

3.45

#428FD1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.08

#428FD1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FD1

6.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FD1	#FFFFFF	#000000	##000000
##428FD1	1.00	3.45	6.08	6.08
#FFFFFF	3.45	1.00	21.00	21.00
#000000	6.08	21.00	1.00	1.00
##000000	6.08	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7292D4

Deuteranopia (green-blind)

#5E84D0

Tritanopia (blue-blind)

#009FA7

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #428fd1;
/* rgb */ color: rgb(66, 143, 209);
/* oklch */ color: oklch(63.1% 0.125 247.3);

Tailwind

colors: {
  custom: {
    50: '#86afdf',
    500: '#428fd1',
    950: '#000000',
  },
}

SCSS

$custom: #428fd1;
$custom-light: #86afdf;
$custom-dark: #000000;

JSON

{
  "hex": "#428fd1",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 209
  },
  "hsl": {
    "h": 207.692,
    "s": 60.851,
    "l": 53.922
  },
  "oklch": {
    "l": 0.63143,
    "c": 0.12533,
    "h": 247.3
  },
  "luminance": 0.25407
}

Semantic roles & 50–950 ramp

primary

#428FD1

secondary

#D6B599

accent

#8E44E4

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428FD1

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

Preview Lab → · Contrast checker → · Palette generator →