#373AB9#373AB9

#373AB9 is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.5% C 0.194 H 273.8°. Best body text is #FFFFFF at 8.51:1 contrast (WCAG AA passes).

Color values

HEX	#373AB9
RGB	rgb(55, 58, 185)
HSL	hsl(239, 54%, 47%)
HSV	hsv(239, 70%, 73%)
CMYK	cmyk(70.3%, 68.6%, 0%, 27.5%)
CIE-LAB	lab(32.57, 40.38, -67.07)
CIE-LCH	lch(32.57, 78.29, 301.05°)
OKLab	oklab(43.55% 0.0129 -0.1938)
OKLCH	oklch(43.55% 0.194 273.8)
XYZ	xyz(11.8426, 7.3400, 46.6822)
Luminance	0.0734 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#373AB9 #B9B637

analogous

#377BB9 #373AB9 #7537B9

triadic

#373AB9 #B9373A #3AB937

tetradic

#373AB9 #B9377B #B9B637 #37B975

square

#373AB9 #B9377B #B9B637 #37B975

split-complementary

#373AB9 #B97537 #7BB937

monochromatic

#1B1C5B #292B8A #373AB9 #5E61CF #8D8FDD

Accessibility & contrast

On white

8.51

#373AB9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.47

#373AB9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #373AB9

8.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##373AB9	#FFFFFF	#000000	##FFFFFF
##373AB9	1.00	8.51	2.47	8.51
#FFFFFF	8.51	1.00	21.00	1.00
#000000	2.47	21.00	1.00	21.00
##FFFFFF	8.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053BD

Deuteranopia (green-blind)

#0047B7

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #373ab9;
/* rgb */ color: rgb(55, 58, 185);
/* oklch */ color: oklch(43.5% 0.194 273.8);

Tailwind

colors: {
  custom: {
    50: '#8071cf',
    500: '#373ab9',
    950: '#000000',
  },
}

SCSS

$custom: #373ab9;
$custom-light: #8071cf;
$custom-dark: #000000;

JSON

{
  "hex": "#373ab9",
  "rgb": {
    "r": 55,
    "g": 58,
    "b": 185
  },
  "hsl": {
    "h": 238.615,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.43546,
    "c": 0.19427,
    "h": 273.8
  },
  "luminance": 0.07341
}

Semantic roles & 50–950 ramp

primary

#373AB9

secondary

#C8C684

accent

#DA4ADE

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #373AB9

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

Preview Lab → · Contrast checker → · Palette generator →