#3740BA#3740BA

#3740BA is a dark, vivid blue. Relative luminance 0.080; OKLCH L 44.6% C 0.189 H 272.7°. Best body text is #FFFFFF at 8.06:1 contrast (WCAG AA passes).

Color values

HEX	#3740BA
RGB	rgb(55, 64, 186)
HSL	hsl(236, 54%, 47%)
HSV	hsv(236, 70%, 73%)
CMYK	cmyk(70.4%, 65.6%, 0%, 27.1%)
CIE-LAB	lab(34.03, 37.04, -65.26)
CIE-LCH	lch(34.03, 75.04, 299.58°)
OKLab	oklab(44.64% 0.0089 -0.1885)
OKLCH	oklch(44.64% 0.189 272.7)
XYZ	xyz(12.2689, 8.0230, 47.3469)
Luminance	0.0802 (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

#3740BA #BAB137

analogous

#3781BA #3740BA #7037BA

triadic

#3740BA #BA3740 #40BA37

tetradic

#3740BA #BA3781 #BAB137 #37BA70

square

#3740BA #BA3781 #BAB137 #37BA70

split-complementary

#3740BA #BA7037 #81BA37

monochromatic

#1B1F5C #29308B #3740BA #5F66D0 #8E93DE

Accessibility & contrast

On white

8.06

#3740BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#3740BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740BA

8.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740BA	#FFFFFF	#000000	##FFFFFF
##3740BA	1.00	8.06	2.60	8.06
#FFFFFF	8.06	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056BE

Deuteranopia (green-blind)

#004AB8

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3740ba;
/* rgb */ color: rgb(55, 64, 186);
/* oklch */ color: oklch(44.6% 0.189 272.7);

Tailwind

colors: {
  custom: {
    50: '#8075d0',
    500: '#3740ba',
    950: '#000000',
  },
}

SCSS

$custom: #3740ba;
$custom-light: #8075d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3740ba",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 186
  },
  "hsl": {
    "h": 235.878,
    "s": 54.357,
    "l": 47.255
  },
  "oklch": {
    "l": 0.44635,
    "c": 0.18874,
    "h": 272.7
  },
  "luminance": 0.08024
}

Semantic roles & 50–950 ramp

primary

#3740BA

secondary

#C8C385

accent

#D44ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3740BA

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

Preview Lab → · Contrast checker → · Palette generator →