#3740A5#3740A5

#3740A5 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 42.8% C 0.161 H 273.6°. Best body text is #FFFFFF at 8.61:1 contrast (WCAG AA passes).

Color values

HEX	#3740A5
RGB	rgb(55, 64, 165)
HSL	hsl(235, 50%, 43%)
HSV	hsv(235, 67%, 65%)
CMYK	cmyk(66.7%, 61.2%, 0%, 35.3%)
CIE-LAB	lab(32.25, 29.63, -55.68)
CIE-LCH	lch(32.25, 63.07, 298.02°)
OKLab	oklab(42.77% 0.01 -0.1604)
OKLCH	oklch(42.77% 0.161 273.6)
XYZ	xyz(10.1982, 7.1947, 36.4413)
Luminance	0.0720 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740A5 #A59C37

analogous

#3777A5 #3740A5 #6537A5

triadic

#3740A5 #A53740 #40A537

tetradic

#3740A5 #A53777 #A59C37 #37A565

square

#3740A5 #A53777 #A59C37 #37A565

split-complementary

#3740A5 #A56537 #77A537

monochromatic

#181C49 #282E77 #3740A5 #535DC6 #8188D5

Accessibility & contrast

On white

8.61

#3740A5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.44

#3740A5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740A5

8.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740A5	#FFFFFF	#000000	##FFFFFF
##3740A5	1.00	8.61	2.44	8.61
#FFFFFF	8.61	1.00	21.00	1.00
#000000	2.44	21.00	1.00	21.00
##FFFFFF	8.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051A8

Deuteranopia (green-blind)

#0047A3

Tritanopia (blue-blind)

#00596C

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3740a5;
/* rgb */ color: rgb(55, 64, 165);
/* oklch */ color: oklch(42.8% 0.161 273.6);

Tailwind

colors: {
  custom: {
    50: '#7b74c1',
    500: '#3740a5',
    950: '#000000',
  },
}

SCSS

$custom: #3740a5;
$custom-light: #7b74c1;
$custom-dark: #000000;

JSON

{
  "hex": "#3740a5",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 165
  },
  "hsl": {
    "h": 235.091,
    "s": 50,
    "l": 43.137
  },
  "oklch": {
    "l": 0.42773,
    "c": 0.16073,
    "h": 273.6
  },
  "luminance": 0.07196
}

Semantic roles & 50–950 ramp

primary

#3740A5

secondary

#BFB979

accent

#CE4EDA

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #3740A5

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

Preview Lab → · Contrast checker → · Palette generator →