#373EA8#373EA8

#373EA8 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.7% C 0.167 H 274.0°. Best body text is #FFFFFF at 8.69:1 contrast (WCAG AA passes).

Color values

HEX	#373EA8
RGB	rgb(55, 62, 168)
HSL	hsl(236, 51%, 44%)
HSV	hsv(236, 67%, 66%)
CMYK	cmyk(67.3%, 63.1%, 0%, 34.1%)
CIE-LAB	lab(32.00, 31.99, -57.88)
CIE-LCH	lch(32.00, 66.14, 298.93°)
OKLab	oklab(42.67% 0.0115 -0.1669)
OKLCH	oklch(42.67% 0.167 274)
XYZ	xyz(10.3637, 7.0837, 37.8593)
Luminance	0.0708 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373EA8 #A8A137

analogous

#3776A8 #373EA8 #6837A8

triadic

#373EA8 #A8373E #3EA837

tetradic

#373EA8 #A83776 #A8A137 #37A868

square

#373EA8 #A83776 #A8A137 #37A868

split-complementary

#373EA8 #A86837 #76A837

monochromatic

#191C4C #282D7A #373EA8 #555CC7 #8388D6

Accessibility & contrast

On white

8.69

#373EA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.42

#373EA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373EA8

8.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373EA8	#FFFFFF	#000000	##FFFFFF
##373EA8	1.00	8.69	2.42	8.69
#FFFFFF	8.69	1.00	21.00	1.00
#000000	2.42	21.00	1.00	21.00
##FFFFFF	8.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050AB

Deuteranopia (green-blind)

#0046A6

Tritanopia (blue-blind)

#00596D

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #373ea8;
/* rgb */ color: rgb(55, 62, 168);
/* oklch */ color: oklch(42.7% 0.167 274.0);

Tailwind

colors: {
  custom: {
    50: '#7c73c3',
    500: '#373ea8',
    950: '#000000',
  },
}

SCSS

$custom: #373ea8;
$custom-light: #7c73c3;
$custom-dark: #000000;

JSON

{
  "hex": "#373ea8",
  "rgb": {
    "r": 55,
    "g": 62,
    "b": 168
  },
  "hsl": {
    "h": 236.283,
    "s": 50.673,
    "l": 43.725
  },
  "oklch": {
    "l": 0.42666,
    "c": 0.16732,
    "h": 274
  },
  "luminance": 0.07085
}

Semantic roles & 50–950 ramp

primary

#373EA8

secondary

#C0BC7B

accent

#D14EDA

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #373EA8

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

Preview Lab → · Contrast checker → · Palette generator →