#428DCB#428DCB

#428DCB is a light, moderate cyan. Relative luminance 0.245; OKLCH L 62.4% C 0.120 H 246.3°. Best body text is #000000 at 5.90:1 contrast (WCAG AA passes).

Color values

HEX	#428DCB
RGB	rgb(66, 141, 203)
HSL	hsl(207, 57%, 53%)
HSV	hsv(207, 67%, 80%)
CMYK	cmyk(67.5%, 30.5%, 0%, 20.4%)
CIE-LAB	lab(56.60, -3.42, -38.82)
CIE-LCH	lch(56.60, 38.97, 264.96°)
OKLab	oklab(62.37% -0.0482 -0.1097)
OKLCH	oklch(62.37% 0.12 246.3)
XYZ	xyz(22.5471, 24.5174, 60.0324)
Luminance	0.2452 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DCB #CB8042

analogous

#42CBC4 #428DCB #4249CB

triadic

#428DCB #CB428D #8DCB42

tetradic

#428DCB #C442CB #CB8042 #49CB42

square

#428DCB #C442CB #CB8042 #49CB42

split-complementary

#428DCB #CB4249 #CBC442

monochromatic

#204D73 #2D6EA3 #428DCB #72AAD8 #A2C7E5

Accessibility & contrast

On white

3.56

#428DCB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.90

#428DCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DCB

5.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DCB	#FFFFFF	#000000	##000000
##428DCB	1.00	3.56	5.90	5.90
#FFFFFF	3.56	1.00	21.00	21.00
#000000	5.90	21.00	1.00	1.00
##000000	5.90	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#718FCE

Deuteranopia (green-blind)

#5E82CA

Tritanopia (blue-blind)

#009CA3

Achromatopsia (no color)

#888888

Design tokens & code

CSS

--color: #428dcb;
/* rgb */ color: rgb(66, 141, 203);
/* oklch */ color: oklch(62.4% 0.120 246.3);

Tailwind

colors: {
  custom: {
    50: '#85aedb',
    500: '#428dcb',
    950: '#000000',
  },
}

SCSS

$custom: #428dcb;
$custom-light: #85aedb;
$custom-dark: #000000;

JSON

{
  "hex": "#428dcb",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 203
  },
  "hsl": {
    "h": 207.153,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.62369,
    "c": 0.11985,
    "h": 246.3
  },
  "luminance": 0.2452
}

Semantic roles & 50–950 ramp

primary

#428DCB

secondary

#D2B297

accent

#8D48E0

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428DCB

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

Preview Lab → · Contrast checker → · Palette generator →