#428FCB#428FCB

#428FCB is a light, moderate cyan. Relative luminance 0.251; OKLCH L 62.8% C 0.118 H 244.9°. Best body text is #000000 at 6.02:1 contrast (WCAG AA passes).

Color values

HEX	#428FCB
RGB	rgb(66, 143, 203)
HSL	hsl(206, 57%, 53%)
HSV	hsv(206, 67%, 80%)
CMYK	cmyk(67.5%, 29.6%, 0%, 20.4%)
CIE-LAB	lab(57.19, -4.58, -37.91)
CIE-LCH	lch(57.19, 38.18, 263.11°)
OKLab	oklab(62.83% -0.0502 -0.1071)
OKLCH	oklch(62.83% 0.118 244.9)
XYZ	xyz(22.8446, 25.1126, 60.1316)
Luminance	0.2511 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FCB #CB7E42

analogous

#42CBC2 #428FCB #424BCB

triadic

#428FCB #CB428F #8FCB42

tetradic

#428FCB #C242CB #CB7E42 #4BCB42

square

#428FCB #C242CB #CB7E42 #4BCB42

split-complementary

#428FCB #CB424B #CBC242

monochromatic

#204E73 #2D6FA3 #428FCB #72ABD8 #A2C8E5

Accessibility & contrast

On white

3.49

#428FCB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.02

#428FCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FCB

6.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FCB	#FFFFFF	#000000	##000000
##428FCB	1.00	3.49	6.02	6.02
#FFFFFF	3.49	1.00	21.00	21.00
#000000	6.02	21.00	1.00	1.00
##000000	6.02	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7491CE

Deuteranopia (green-blind)

#6183CA

Tritanopia (blue-blind)

#009EA4

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428fcb;
/* rgb */ color: rgb(66, 143, 203);
/* oklch */ color: oklch(62.8% 0.118 244.9);

Tailwind

colors: {
  custom: {
    50: '#85afdb',
    500: '#428fcb',
    950: '#000000',
  },
}

SCSS

$custom: #428fcb;
$custom-light: #85afdb;
$custom-dark: #000000;

JSON

{
  "hex": "#428fcb",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 203
  },
  "hsl": {
    "h": 206.277,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.62828,
    "c": 0.11825,
    "h": 244.9
  },
  "luminance": 0.25115
}

Semantic roles & 50–950 ramp

primary

#428FCB

secondary

#D2B197

accent

#8A48E0

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428FCB

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

Preview Lab → · Contrast checker → · Palette generator →