#373B99#373B99

#373B99 is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.8% C 0.151 H 275.6°. Best body text is #FFFFFF at 9.34:1 contrast (WCAG AA passes).

Color values

HEX	#373B99
RGB	rgb(55, 59, 153)
HSL	hsl(238, 47%, 41%)
HSV	hsv(238, 64%, 60%)
CMYK	cmyk(64.1%, 61.4%, 0%, 40%)
CIE-LAB	lab(30.01, 28.63, -52.06)
CIE-LCH	lch(30.01, 59.41, 298.81°)
OKLab	oklab(40.82% 0.0147 -0.1498)
OKLCH	oklch(40.82% 0.151 275.6)
XYZ	xyz(8.8874, 6.2393, 30.8668)
Luminance	0.0624 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373B99 #999537

analogous

#376C99 #373B99 #643799

triadic

#373B99 #99373B #3B9937

tetradic

#373B99 #99376C #999537 #379964

square

#373B99 #99376C #999537 #379964

split-complementary

#373B99 #996437 #6C9937

monochromatic

#17183F #272A6C #373B99 #4E53BF #7B7ED0

Accessibility & contrast

On white

9.34

#373B99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.25

#373B99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373B99

9.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373B99	#FFFFFF	#000000	##FFFFFF
##373B99	1.00	9.34	2.25	9.34
#FFFFFF	9.34	1.00	21.00	1.00
#000000	2.25	21.00	1.00	21.00
##FFFFFF	9.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B9C

Deuteranopia (green-blind)

#004297

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #373b99;
/* rgb */ color: rgb(55, 59, 153);
/* oklch */ color: oklch(40.8% 0.151 275.6);

Tailwind

colors: {
  custom: {
    50: '#7971b8',
    500: '#373b99',
    950: '#000000',
  },
}

SCSS

$custom: #373b99;
$custom-light: #7971b8;
$custom-dark: #000000;

JSON

{
  "hex": "#373b99",
  "rgb": {
    "r": 55,
    "g": 59,
    "b": 153
  },
  "hsl": {
    "h": 237.551,
    "s": 47.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.40815,
    "c": 0.15056,
    "h": 275.6
  },
  "luminance": 0.0624
}

Semantic roles & 50–950 ramp

primary

#373B99

secondary

#B9B673

accent

#D151D7

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#0A0711

muted

#7C7A80

Preview Lab

Preview with #373B99

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

Preview Lab → · Contrast checker → · Palette generator →