#373DB3#373DB3

#373DB3 is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.5% C 0.183 H 273.6°. Best body text is #FFFFFF at 8.47:1 contrast (WCAG AA passes).

Color values

HEX	#373DB3
RGB	rgb(55, 61, 179)
HSL	hsl(237, 53%, 46%)
HSV	hsv(237, 69%, 70%)
CMYK	cmyk(69.3%, 65.9%, 0%, 29.8%)
CIE-LAB	lab(32.71, 36.48, -63.29)
CIE-LCH	lch(32.71, 73.05, 299.96°)
OKLab	oklab(43.48% 0.0115 -0.1828)
OKLCH	oklch(43.48% 0.183 273.6)
XYZ	xyz(11.3783, 7.4033, 43.4684)
Luminance	0.0740 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373DB3 #B3AD37

analogous

#377BB3 #373DB3 #6F37B3

triadic

#373DB3 #B3373D #3DB337

tetradic

#373DB3 #B3377B #B3AD37 #37B36F

square

#373DB3 #B3377B #B3AD37 #37B36F

split-complementary

#373DB3 #B36F37 #7BB337

monochromatic

#1A1D55 #292D84 #373DB3 #5B60CD #8A8DDB

Accessibility & contrast

On white

8.47

#373DB3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.48

#373DB3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373DB3

8.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373DB3	#FFFFFF	#000000	##FFFFFF
##373DB3	1.00	8.47	2.48	8.47
#FFFFFF	8.47	1.00	21.00	1.00
#000000	2.48	21.00	1.00	21.00
##FFFFFF	8.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B7

Deuteranopia (green-blind)

#0047B1

Tritanopia (blue-blind)

#005C72

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #373db3;
/* rgb */ color: rgb(55, 61, 179);
/* oklch */ color: oklch(43.5% 0.183 273.6);

Tailwind

colors: {
  custom: {
    50: '#7e73cb',
    500: '#373db3',
    950: '#000000',
  },
}

SCSS

$custom: #373db3;
$custom-light: #7e73cb;
$custom-dark: #000000;

JSON

{
  "hex": "#373db3",
  "rgb": {
    "r": 55,
    "g": 61,
    "b": 179
  },
  "hsl": {
    "h": 237.097,
    "s": 52.991,
    "l": 45.882
  },
  "oklch": {
    "l": 0.4348,
    "c": 0.18312,
    "h": 273.6
  },
  "luminance": 0.07404
}

Semantic roles & 50–950 ramp

primary

#373DB3

secondary

#C5C281

accent

#D54BDC

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #373DB3

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

Preview Lab → · Contrast checker → · Palette generator →