#373EA6#373EA6

#373EA6 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.5% C 0.165 H 274.1°. Best body text is #FFFFFF at 8.74:1 contrast (WCAG AA passes).

Color values

HEX	#373EA6
RGB	rgb(55, 62, 166)
HSL	hsl(236, 50%, 43%)
HSV	hsv(236, 67%, 65%)
CMYK	cmyk(66.9%, 62.7%, 0%, 34.9%)
CIE-LAB	lab(31.83, 31.28, -56.96)
CIE-LCH	lch(31.83, 64.98, 298.78°)
OKLab	oklab(42.49% 0.0116 -0.1642)
OKLCH	oklch(42.49% 0.165 274.1)
XYZ	xyz(10.1788, 7.0097, 36.8856)
Luminance	0.0701 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373EA6 #A69F37

analogous

#3775A6 #373EA6 #6737A6

triadic

#373EA6 #A6373E #3EA637

tetradic

#373EA6 #A63775 #A69F37 #37A667

square

#373EA6 #A63775 #A69F37 #37A667

split-complementary

#373EA6 #A66737 #75A637

monochromatic

#191C4A #282D78 #373EA6 #545BC6 #8287D6

Accessibility & contrast

On white

8.74

#373EA6 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.40

#373EA6 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373EA6

8.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373EA6	#FFFFFF	#000000	##FFFFFF
##373EA6	1.00	8.74	2.40	8.74
#FFFFFF	8.74	1.00	21.00	1.00
#000000	2.40	21.00	1.00	21.00
##FFFFFF	8.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050A9

Deuteranopia (green-blind)

#0046A4

Tritanopia (blue-blind)

#00586C

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #373ea6;
/* rgb */ color: rgb(55, 62, 166);
/* oklch */ color: oklch(42.5% 0.165 274.1);

Tailwind

colors: {
  custom: {
    50: '#7c73c1',
    500: '#373ea6',
    950: '#000000',
  },
}

SCSS

$custom: #373ea6;
$custom-light: #7c73c1;
$custom-dark: #000000;

JSON

{
  "hex": "#373ea6",
  "rgb": {
    "r": 55,
    "g": 62,
    "b": 166
  },
  "hsl": {
    "h": 236.216,
    "s": 50.226,
    "l": 43.333
  },
  "oklch": {
    "l": 0.42491,
    "c": 0.16461,
    "h": 274.1
  },
  "luminance": 0.07011
}

Semantic roles & 50–950 ramp

primary

#373EA6

secondary

#BFBB7A

accent

#D14EDA

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0812

muted

#7C7B81

Preview Lab

Preview with #373EA6

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

Preview Lab → · Contrast checker → · Palette generator →