#4278C5#4278C5

#4278C5 is a mid, vivid blue. Relative luminance 0.186; OKLCH L 57.3% C 0.133 H 257.5°. Best body text is #000000 at 4.72:1 contrast (WCAG AA passes).

Color values

HEX	#4278C5
RGB	rgb(66, 120, 197)
HSL	hsl(215, 53%, 52%)
HSV	hsv(215, 66%, 77%)
CMYK	cmyk(66.5%, 39.1%, 0%, 22.7%)
CIE-LAB	lab(50.24, 7.03, -45.46)
CIE-LCH	lch(50.24, 46.00, 278.79°)
OKLab	oklab(57.29% -0.0287 -0.1294)
OKLCH	oklch(57.29% 0.133 257.5)
XYZ	xyz(19.0377, 18.6205, 55.4033)
Luminance	0.1862 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278C5 #C58F42

analogous

#42BAC5 #4278C5 #4E42C5

triadic

#4278C5 #C54278 #78C542

tetradic

#4278C5 #C542BA #C58F42 #42C54E

square

#4278C5 #C542BA #C58F42 #42C54E

split-complementary

#4278C5 #C54E42 #BAC542

monochromatic

#21406C #2F5C9A #4278C5 #7199D3 #A0BBE2

Accessibility & contrast

On white

4.45

#4278C5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.72

#4278C5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278C5

4.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278C5	#FFFFFF	#000000	##000000
##4278C5	1.00	4.45	4.72	4.72
#FFFFFF	4.45	1.00	21.00	21.00
#000000	4.72	21.00	1.00	1.00
##000000	4.72	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#557EC8

Deuteranopia (green-blind)

#4272C3

Tritanopia (blue-blind)

#008A95

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #4278c5;
/* rgb */ color: rgb(66, 120, 197);
/* oklch */ color: oklch(57.3% 0.133 257.5);

Tailwind

colors: {
  custom: {
    50: '#849ed7',
    500: '#4278c5',
    950: '#000000',
  },
}

SCSS

$custom: #4278c5;
$custom-light: #849ed7;
$custom-dark: #000000;

JSON

{
  "hex": "#4278c5",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 197
  },
  "hsl": {
    "h": 215.267,
    "s": 53.036,
    "l": 51.569
  },
  "oklch": {
    "l": 0.57288,
    "c": 0.13254,
    "h": 257.5
  },
  "luminance": 0.18622
}

Semantic roles & 50–950 ramp

primary

#4278C5

secondary

#CEB695

accent

#A14BDC

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E14

muted

#7D7E83

Preview Lab

Preview with #4278C5

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

Preview Lab → · Contrast checker → · Palette generator →