#373FA8#373FA8

#373FA8 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 42.8% C 0.166 H 273.7°. Best body text is #FFFFFF at 8.61:1 contrast (WCAG AA passes).

Color values

HEX	#373FA8
RGB	rgb(55, 63, 168)
HSL	hsl(236, 51%, 44%)
HSV	hsv(236, 67%, 66%)
CMYK	cmyk(67.3%, 62.5%, 0%, 34.1%)
CIE-LAB	lab(32.24, 31.35, -57.48)
CIE-LCH	lch(32.24, 65.47, 298.60°)
OKLab	oklab(42.85% 0.0107 -0.1657)
OKLCH	oklch(42.85% 0.166 273.7)
XYZ	xyz(10.4186, 7.1935, 37.8776)
Luminance	0.0719 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373FA8 #A8A037

analogous

#3777A8 #373FA8 #6737A8

triadic

#373FA8 #A8373F #3FA837

tetradic

#373FA8 #A83777 #A8A037 #37A867

square

#373FA8 #A83777 #A8A037 #37A867

split-complementary

#373FA8 #A86737 #77A837

monochromatic

#191C4C #282E7A #373FA8 #555DC7 #8389D6

Accessibility & contrast

On white

8.61

#373FA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.44

#373FA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373FA8

8.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373FA8	#FFFFFF	#000000	##FFFFFF
##373FA8	1.00	8.61	2.44	8.61
#FFFFFF	8.61	1.00	21.00	1.00
#000000	2.44	21.00	1.00	21.00
##FFFFFF	8.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051AB

Deuteranopia (green-blind)

#0047A6

Tritanopia (blue-blind)

#005A6D

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #373fa8;
/* rgb */ color: rgb(55, 63, 168);
/* oklch */ color: oklch(42.8% 0.166 273.7);

Tailwind

colors: {
  custom: {
    50: '#7c74c3',
    500: '#373fa8',
    950: '#000000',
  },
}

SCSS

$custom: #373fa8;
$custom-light: #7c74c3;
$custom-dark: #000000;

JSON

{
  "hex": "#373fa8",
  "rgb": {
    "r": 55,
    "g": 63,
    "b": 168
  },
  "hsl": {
    "h": 235.752,
    "s": 50.673,
    "l": 43.725
  },
  "oklch": {
    "l": 0.42848,
    "c": 0.16608,
    "h": 273.7
  },
  "luminance": 0.07194
}

Semantic roles & 50–950 ramp

primary

#373FA8

secondary

#C0BB7B

accent

#D04EDA

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #373FA8

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

Preview Lab → · Contrast checker → · Palette generator →