#373EA5#373EA5

#373EA5 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.4% C 0.163 H 274.1°. Best body text is #FFFFFF at 8.77:1 contrast (WCAG AA passes).

Color values

HEX	#373EA5
RGB	rgb(55, 62, 165)
HSL	hsl(236, 50%, 43%)
HSV	hsv(236, 67%, 65%)
CMYK	cmyk(66.7%, 62.4%, 0%, 35.3%)
CIE-LAB	lab(31.75, 30.93, -56.49)
CIE-LCH	lch(31.75, 64.40, 298.70°)
OKLab	oklab(42.4% 0.0117 -0.1628)
OKLCH	oklch(42.4% 0.163 274.1)
XYZ	xyz(10.0875, 6.9732, 36.4044)
Luminance	0.0697 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373EA5 #A59E37

analogous

#3775A5 #373EA5 #6737A5

triadic

#373EA5 #A5373E #3EA537

tetradic

#373EA5 #A53775 #A59E37 #37A567

square

#373EA5 #A53775 #A59E37 #37A567

split-complementary

#373EA5 #A56737 #75A537

monochromatic

#181C49 #282D77 #373EA5 #535BC6 #8187D5

Accessibility & contrast

On white

8.77

#373EA5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#373EA5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373EA5

8.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373EA5	#FFFFFF	#000000	##FFFFFF
##373EA5	1.00	8.77	2.39	8.77
#FFFFFF	8.77	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050A8

Deuteranopia (green-blind)

#0046A3

Tritanopia (blue-blind)

#00586B

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #373ea5;
/* rgb */ color: rgb(55, 62, 165);
/* oklch */ color: oklch(42.4% 0.163 274.1);

Tailwind

colors: {
  custom: {
    50: '#7b73c1',
    500: '#373ea5',
    950: '#000000',
  },
}

SCSS

$custom: #373ea5;
$custom-light: #7b73c1;
$custom-dark: #000000;

JSON

{
  "hex": "#373ea5",
  "rgb": {
    "r": 55,
    "g": 62,
    "b": 165
  },
  "hsl": {
    "h": 236.182,
    "s": 50,
    "l": 43.137
  },
  "oklch": {
    "l": 0.42404,
    "c": 0.16325,
    "h": 274.1
  },
  "luminance": 0.06974
}

Semantic roles & 50–950 ramp

primary

#373EA5

secondary

#BFBA79

accent

#D14EDA

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0B0812

muted

#7C7B81

Preview Lab

Preview with #373EA5

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

Preview Lab → · Contrast checker → · Palette generator →