#373F99#373F99

#373F99 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 41.6% C 0.145 H 274.3°. Best body text is #FFFFFF at 9.00:1 contrast (WCAG AA passes).

Color values

HEX	#373F99
RGB	rgb(55, 63, 153)
HSL	hsl(235, 47%, 41%)
HSV	hsv(235, 64%, 60%)
CMYK	cmyk(64.1%, 58.8%, 0%, 40%)
CIE-LAB	lab(31.04, 26.01, -50.39)
CIE-LCH	lch(31.04, 56.71, 297.30°)
OKLab	oklab(41.58% 0.011 -0.1449)
OKLCH	oklch(41.58% 0.145 274.3)
XYZ	xyz(9.1009, 6.6664, 30.9380)
Luminance	0.0667 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373F99 #999137

analogous

#377099 #373F99 #603799

triadic

#373F99 #99373F #3F9937

tetradic

#373F99 #993770 #999137 #379960

square

#373F99 #993770 #999137 #379960

split-complementary

#373F99 #996037 #709937

monochromatic

#171A3F #272C6C #373F99 #4E57BF #7B82D0

Accessibility & contrast

On white

9.00

#373F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#373F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373F99

9.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373F99	#FFFFFF	#000000	##FFFFFF
##373F99	1.00	9.00	2.33	9.00
#FFFFFF	9.00	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9C

Deuteranopia (green-blind)

#004597

Tritanopia (blue-blind)

#005565

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #373f99;
/* rgb */ color: rgb(55, 63, 153);
/* oklch */ color: oklch(41.6% 0.145 274.3);

Tailwind

colors: {
  custom: {
    50: '#7974b8',
    500: '#373f99',
    950: '#000000',
  },
}

SCSS

$custom: #373f99;
$custom-light: #7974b8;
$custom-dark: #000000;

JSON

{
  "hex": "#373f99",
  "rgb": {
    "r": 55,
    "g": 63,
    "b": 153
  },
  "hsl": {
    "h": 235.102,
    "s": 47.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.41576,
    "c": 0.14531,
    "h": 274.3
  },
  "luminance": 0.06667
}

Semantic roles & 50–950 ramp

primary

#373F99

secondary

#B9B373

accent

#CC51D7

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#0A0811

muted

#7C7B80

Preview Lab

Preview with #373F99

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

Preview Lab → · Contrast checker → · Palette generator →