#4278CF#4278CF

#4278CF is a mid, vivid blue. Relative luminance 0.191; OKLCH L 57.9% C 0.146 H 259.5°. Best body text is #000000 at 4.82:1 contrast (WCAG AA passes).

Color values

HEX	#4278CF
RGB	rgb(66, 120, 207)
HSL	hsl(217, 59%, 54%)
HSV	hsv(217, 68%, 81%)
CMYK	cmyk(68.1%, 42%, 0%, 18.8%)
CIE-LAB	lab(50.80, 10.57, -50.28)
CIE-LCH	lch(50.80, 51.38, 281.87°)
OKLab	oklab(57.9% -0.0266 -0.1435)
OKLCH	oklch(57.9% 0.146 259.5)
XYZ	xyz(20.2217, 19.0941, 61.6392)
Luminance	0.1910 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278CF #CF9942

analogous

#42BFCF #4278CF #5242CF

triadic

#4278CF #CF4278 #78CF42

tetradic

#4278CF #CF42BF #CF9942 #42CF52

square

#4278CF #CF42BF #CF9942 #42CF52

split-complementary

#4278CF #CF5242 #BFCF42

monochromatic

#1F4178 #2B5BA9 #4278CF #739BDB #A4BEE8

Accessibility & contrast

On white

4.36

#4278CF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.82

#4278CF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278CF

4.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278CF	#FFFFFF	#000000	##000000
##4278CF	1.00	4.36	4.82	4.82
#FFFFFF	4.36	1.00	21.00	21.00
#000000	4.82	21.00	1.00	1.00
##000000	4.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F80D2

Deuteranopia (green-blind)

#3873CD

Tritanopia (blue-blind)

#008C99

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #4278cf;
/* rgb */ color: rgb(66, 120, 207);
/* oklch */ color: oklch(57.9% 0.146 259.5);

Tailwind

colors: {
  custom: {
    50: '#869ede',
    500: '#4278cf',
    950: '#000000',
  },
}

SCSS

$custom: #4278cf;
$custom-light: #869ede;
$custom-dark: #000000;

JSON

{
  "hex": "#4278cf",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 207
  },
  "hsl": {
    "h": 217.021,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.57901,
    "c": 0.14598,
    "h": 259.5
  },
  "luminance": 0.19096
}

Semantic roles & 50–950 ramp

primary

#4278CF

secondary

#D5BD98

accent

#A645E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #4278CF

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

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