#4278CB#4278CB

#4278CB is a mid, vivid blue. Relative luminance 0.189; OKLCH L 57.7% C 0.141 H 258.8°. Best body text is #000000 at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#4278CB
RGB	rgb(66, 120, 203)
HSL	hsl(216, 57%, 53%)
HSV	hsv(216, 67%, 80%)
CMYK	cmyk(67.5%, 40.9%, 0%, 20.4%)
CIE-LAB	lab(50.57, 9.15, -48.36)
CIE-LCH	lch(50.57, 49.22, 280.71°)
OKLab	oklab(57.65% -0.0274 -0.1379)
OKLCH	oklch(57.65% 0.141 258.8)
XYZ	xyz(19.7389, 18.9010, 59.0963)
Luminance	0.1890 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278CB #CB9542

analogous

#42BDCB #4278CB #5042CB

triadic

#4278CB #CB4278 #78CB42

tetradic

#4278CB #CB42BD #CB9542 #42CB50

square

#4278CB #CB42BD #CB9542 #42CB50

split-complementary

#4278CB #CB5042 #BDCB42

monochromatic

#204073 #2D5BA3 #4278CB #729AD8 #A2BDE5

Accessibility & contrast

On white

4.39

#4278CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.78

#4278CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278CB

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278CB	#FFFFFF	#000000	##000000
##4278CB	1.00	4.39	4.78	4.78
#FFFFFF	4.39	1.00	21.00	21.00
#000000	4.78	21.00	1.00	1.00
##000000	4.78	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#527FCE

Deuteranopia (green-blind)

#3C73C9

Tritanopia (blue-blind)

#008B97

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #4278cb;
/* rgb */ color: rgb(66, 120, 203);
/* oklch */ color: oklch(57.7% 0.141 258.8);

Tailwind

colors: {
  custom: {
    50: '#859edb',
    500: '#4278cb',
    950: '#000000',
  },
}

SCSS

$custom: #4278cb;
$custom-light: #859edb;
$custom-dark: #000000;

JSON

{
  "hex": "#4278cb",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 203
  },
  "hsl": {
    "h": 216.35,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.57653,
    "c": 0.1406,
    "h": 258.8
  },
  "luminance": 0.18903
}

Semantic roles & 50–950 ramp

primary

#4278CB

secondary

#D2BB97

accent

#A448E0

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #4278CB

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

Preview Lab → · Contrast checker → · Palette generator →