#3741BB#3741BB

#3741BB is a dark, vivid blue. Relative luminance 0.082; OKLCH L 44.9% C 0.189 H 272.5°. Best body text is #FFFFFF at 7.97:1 contrast (WCAG AA passes).

Color values

HEX	#3741BB
RGB	rgb(55, 65, 187)
HSL	hsl(235, 55%, 47%)
HSV	hsv(235, 71%, 73%)
CMYK	cmyk(70.6%, 65.2%, 0%, 26.7%)
CIE-LAB	lab(34.35, 36.77, -65.32)
CIE-LCH	lch(34.35, 74.96, 299.37°)
OKLab	oklab(44.9% 0.0081 -0.1887)
OKLCH	oklch(44.9% 0.189 272.5)
XYZ	xyz(12.4325, 8.1795, 47.9277)
Luminance	0.0818 (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

#3741BB #BBB137

analogous

#3783BB #3741BB #6F37BB

triadic

#3741BB #BB3741 #41BB37

tetradic

#3741BB #BB3783 #BBB137 #37BB6F

square

#3741BB #BB3783 #BBB137 #37BB6F

split-complementary

#3741BB #BB6F37 #83BB37

monochromatic

#1B205C #29318C #3741BB #5F68D0 #8E95DE

Accessibility & contrast

On white

7.97

#3741BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.64

#3741BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3741BB

7.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3741BB	#FFFFFF	#000000	##FFFFFF
##3741BB	1.00	7.97	2.64	7.97
#FFFFFF	7.97	1.00	21.00	1.00
#000000	2.64	21.00	1.00	21.00
##FFFFFF	7.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057BF

Deuteranopia (green-blind)

#004BB9

Tritanopia (blue-blind)

#006178

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3741bb;
/* rgb */ color: rgb(55, 65, 187);
/* oklch */ color: oklch(44.9% 0.189 272.5);

Tailwind

colors: {
  custom: {
    50: '#8076d0',
    500: '#3741bb',
    950: '#000000',
  },
}

SCSS

$custom: #3741bb;
$custom-light: #8076d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3741bb",
  "rgb": {
    "r": 55,
    "g": 65,
    "b": 187
  },
  "hsl": {
    "h": 235.455,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.44898,
    "c": 0.18887,
    "h": 272.5
  },
  "luminance": 0.08181
}

Semantic roles & 50–950 ramp

primary

#3741BB

secondary

#C9C385

accent

#D34ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3741BB

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

Preview Lab → · Contrast checker → · Palette generator →