#4278CC#4278CC

#4278CC is a mid, vivid blue. Relative luminance 0.190; OKLCH L 57.7% C 0.142 H 259.0°. Best body text is #000000 at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#4278CC
RGB	rgb(66, 120, 204)
HSL	hsl(217, 58%, 53%)
HSV	hsv(217, 68%, 80%)
CMYK	cmyk(67.6%, 41.2%, 0%, 20%)
CIE-LAB	lab(50.63, 9.51, -48.84)
CIE-LCH	lch(50.63, 49.76, 281.01°)
OKLab	oklab(57.72% -0.0272 -0.1393)
OKLCH	oklch(57.72% 0.142 259)
XYZ	xyz(19.8584, 18.9488, 59.7260)
Luminance	0.1895 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278CC #CC9642

analogous

#42BDCC #4278CC #5142CC

triadic

#4278CC #CC4278 #78CC42

tetradic

#4278CC #CC42BD #CC9642 #42CC51

square

#4278CC #CC42BD #CC9642 #42CC51

split-complementary

#4278CC #CC5142 #BDCC42

monochromatic

#1F4174 #2C5BA4 #4278CC #729AD9 #A2BDE6

Accessibility & contrast

On white

4.38

#4278CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.79

#4278CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278CC

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278CC	#FFFFFF	#000000	##000000
##4278CC	1.00	4.38	4.79	4.79
#FFFFFF	4.38	1.00	21.00	21.00
#000000	4.79	21.00	1.00	1.00
##000000	4.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#517FCF

Deuteranopia (green-blind)

#3B73CA

Tritanopia (blue-blind)

#008B98

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #4278cc;
/* rgb */ color: rgb(66, 120, 204);
/* oklch */ color: oklch(57.7% 0.142 259.0);

Tailwind

colors: {
  custom: {
    50: '#859edc',
    500: '#4278cc',
    950: '#000000',
  },
}

SCSS

$custom: #4278cc;
$custom-light: #859edc;
$custom-dark: #000000;

JSON

{
  "hex": "#4278cc",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 204
  },
  "hsl": {
    "h": 216.522,
    "s": 57.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.57715,
    "c": 0.14195,
    "h": 259
  },
  "luminance": 0.18951
}

Semantic roles & 50–950 ramp

primary

#4278CC

secondary

#D3BB97

accent

#A547E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #4278CC

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

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