#3740B9#3740B9

#3740B9 is a dark, vivid blue. Relative luminance 0.080; OKLCH L 44.5% C 0.187 H 272.7°. Best body text is #FFFFFF at 8.09:1 contrast (WCAG AA passes).

Color values

HEX	#3740B9
RGB	rgb(55, 64, 185)
HSL	hsl(236, 54%, 47%)
HSV	hsv(236, 70%, 73%)
CMYK	cmyk(70.3%, 65.4%, 0%, 27.5%)
CIE-LAB	lab(33.94, 36.69, -64.82)
CIE-LCH	lch(33.94, 74.48, 299.52°)
OKLab	oklab(44.54% 0.0089 -0.1872)
OKLCH	oklch(44.54% 0.187 272.7)
XYZ	xyz(12.1630, 7.9806, 46.7890)
Luminance	0.0798 (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

#3740B9 #B9B037

analogous

#3781B9 #3740B9 #6F37B9

triadic

#3740B9 #B93740 #40B937

tetradic

#3740B9 #B93781 #B9B037 #37B96F

square

#3740B9 #B93781 #B9B037 #37B96F

split-complementary

#3740B9 #B96F37 #81B937

monochromatic

#1B1F5B #29308A #3740B9 #5E66CF #8D93DD

Accessibility & contrast

On white

8.09

#3740B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#3740B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740B9

8.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740B9	#FFFFFF	#000000	##FFFFFF
##3740B9	1.00	8.09	2.60	8.09
#FFFFFF	8.09	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056BD

Deuteranopia (green-blind)

#004AB7

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3740b9;
/* rgb */ color: rgb(55, 64, 185);
/* oklch */ color: oklch(44.5% 0.187 272.7);

Tailwind

colors: {
  custom: {
    50: '#7f75cf',
    500: '#3740b9',
    950: '#000000',
  },
}

SCSS

$custom: #3740b9;
$custom-light: #7f75cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3740b9",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 185
  },
  "hsl": {
    "h": 235.846,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.44544,
    "c": 0.18744,
    "h": 272.7
  },
  "luminance": 0.07982
}

Semantic roles & 50–950 ramp

primary

#3740B9

secondary

#C8C384

accent

#D34ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3740B9

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

Preview Lab → · Contrast checker → · Palette generator →