#3738BB#3738BB

#3738BB is a dark, vivid blue. Relative luminance 0.072; OKLCH L 43.4% C 0.199 H 274.0°. Best body text is #FFFFFF at 8.59:1 contrast (WCAG AA passes).

Color values

HEX	#3738BB
RGB	rgb(55, 56, 187)
HSL	hsl(240, 55%, 47%)
HSV	hsv(240, 71%, 73%)
CMYK	cmyk(70.6%, 70.1%, 0%, 26.7%)
CIE-LAB	lab(32.32, 42.26, -68.66)
CIE-LCH	lch(32.32, 80.62, 301.61°)
OKLab	oklab(43.42% 0.0139 -0.1985)
OKLCH	oklch(43.42% 0.199 274)
XYZ	xyz(11.9564, 7.2273, 47.7690)
Luminance	0.0723 (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

#3738BB #BBBA37

analogous

#377ABB #3738BB #7837BB

triadic

#3738BB #BB3738 #38BB37

tetradic

#3738BB #BB377A #BBBA37 #37BB78

square

#3738BB #BB377A #BBBA37 #37BB78

split-complementary

#3738BB #BB7837 #7ABB37

monochromatic

#1B1C5C #292A8C #3738BB #5F60D0 #8E8FDE

Accessibility & contrast

On white

8.59

#3738BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#3738BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3738BB

8.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3738BB	#FFFFFF	#000000	##FFFFFF
##3738BB	1.00	8.59	2.45	8.59
#FFFFFF	8.59	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BF

Deuteranopia (green-blind)

#0046B9

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3738bb;
/* rgb */ color: rgb(55, 56, 187);
/* oklch */ color: oklch(43.4% 0.199 274.0);

Tailwind

colors: {
  custom: {
    50: '#8170d1',
    500: '#3738bb',
    950: '#000000',
  },
}

SCSS

$custom: #3738bb;
$custom-light: #8170d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3738bb",
  "rgb": {
    "r": 55,
    "g": 56,
    "b": 187
  },
  "hsl": {
    "h": 239.545,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.43423,
    "c": 0.19898,
    "h": 274
  },
  "luminance": 0.07228
}

Semantic roles & 50–950 ramp

primary

#3738BB

secondary

#C9C885

accent

#DD4ADE

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3738BB

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

Preview Lab → · Contrast checker → · Palette generator →