#3737AB#3737AB

#3737AB is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.7% C 0.180 H 275.3°. Best body text is #FFFFFF at 9.14:1 contrast (WCAG AA passes).

Color values

HEX	#3737AB
RGB	rgb(55, 55, 171)
HSL	hsl(240, 51%, 44%)
HSV	hsv(240, 68%, 67%)
CMYK	cmyk(67.8%, 67.8%, 0%, 32.9%)
CIE-LAB	lab(30.60, 37.43, -61.97)
CIE-LCH	lch(30.60, 72.39, 301.13°)
OKLab	oklab(41.73% 0.0166 -0.1789)
OKLCH	oklch(41.73% 0.18 275.3)
XYZ	xyz(10.2900, 6.4840, 39.2294)
Luminance	0.0649 (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

#3737AB #ABAB37

analogous

#3771AB #3737AB #7137AB

triadic

#3737AB #AB3737 #37AB37

tetradic

#3737AB #AB3771 #ABAB37 #37AB71

square

#3737AB #AB3771 #ABAB37 #37AB71

split-complementary

#3737AB #AB7137 #71AB37

monochromatic

#19194E #28287D #3737AB #5656C9 #8585D8

Accessibility & contrast

On white

9.14

#3737AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.30

#3737AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737AB

9.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737AB	#FFFFFF	#000000	##FFFFFF
##3737AB	1.00	9.14	2.30	9.14
#FFFFFF	9.14	1.00	21.00	1.00
#000000	2.30	21.00	1.00	21.00
##FFFFFF	9.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DAF

Deuteranopia (green-blind)

#0043A9

Tritanopia (blue-blind)

#00566C

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #3737ab;
/* rgb */ color: rgb(55, 55, 171);
/* oklch */ color: oklch(41.7% 0.180 275.3);

Tailwind

colors: {
  custom: {
    50: '#7d6ec5',
    500: '#3737ab',
    950: '#000000',
  },
}

SCSS

$custom: #3737ab;
$custom-light: #7d6ec5;
$custom-dark: #000000;

JSON

{
  "hex": "#3737ab",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 171
  },
  "hsl": {
    "h": 240,
    "s": 51.327,
    "l": 44.314
  },
  "oklch": {
    "l": 0.4173,
    "c": 0.17969,
    "h": 275.3
  },
  "luminance": 0.06485
}

Semantic roles & 50–950 ramp

primary

#3737AB

secondary

#C1C17C

accent

#DB4DDB

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #3737AB

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

Preview Lab → · Contrast checker → · Palette generator →