#428BCF#428BCF

#428BCF is a light, vivid cyan. Relative luminance 0.241; OKLCH L 62.1% C 0.126 H 249.1°. Best body text is #000000 at 5.83:1 contrast (WCAG AA passes).

Color values

HEX	#428BCF
RGB	rgb(66, 139, 207)
HSL	hsl(209, 59%, 54%)
HSV	hsv(209, 68%, 81%)
CMYK	cmyk(68.1%, 32.9%, 0%, 18.8%)
CIE-LAB	lab(56.21, -0.88, -41.69)
CIE-LCH	lch(56.21, 41.70, 268.79°)
OKLab	oklab(62.13% -0.045 -0.1181)
OKLCH	oklch(62.13% 0.126 249.1)
XYZ	xyz(22.7377, 24.1261, 62.4779)
Luminance	0.2413 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BCF #CF8642

analogous

#42CFCC #428BCF #4244CF

triadic

#428BCF #CF428B #8BCF42

tetradic

#428BCF #CC42CF #CF8642 #44CF42

square

#428BCF #CC42CF #CF8642 #44CF42

split-complementary

#428BCF #CF4244 #CFCC42

monochromatic

#1F4D78 #2B6CA9 #428BCF #73A9DB #A4C7E8

Accessibility & contrast

On white

3.60

#428BCF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.83

#428BCF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BCF

5.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BCF	#FFFFFF	#000000	##000000
##428BCF	1.00	3.60	5.83	5.83
#FFFFFF	3.60	1.00	21.00	21.00
#000000	5.83	21.00	1.00	1.00
##000000	5.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6D8ED2

Deuteranopia (green-blind)

#5981CE

Tritanopia (blue-blind)

#009BA3

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428bcf;
/* rgb */ color: rgb(66, 139, 207);
/* oklch */ color: oklch(62.1% 0.126 249.1);

Tailwind

colors: {
  custom: {
    50: '#85acde',
    500: '#428bcf',
    950: '#000000',
  },
}

SCSS

$custom: #428bcf;
$custom-light: #85acde;
$custom-dark: #000000;

JSON

{
  "hex": "#428bcf",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 207
  },
  "hsl": {
    "h": 208.936,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.62126,
    "c": 0.12641,
    "h": 249.1
  },
  "luminance": 0.24128
}

Semantic roles & 50–950 ramp

primary

#428BCF

secondary

#D5B598

accent

#9145E3

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BCF

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

Preview Lab → · Contrast checker → · Palette generator →