#3740AB#3740AB

#3740AB is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.3% C 0.169 H 273.3°. Best body text is #FFFFFF at 8.45:1 contrast (WCAG AA passes).

Color values

HEX	#3740AB
RGB	rgb(55, 64, 171)
HSL	hsl(235, 51%, 44%)
HSV	hsv(235, 68%, 67%)
CMYK	cmyk(67.8%, 62.6%, 0%, 32.9%)
CIE-LAB	lab(32.74, 31.77, -58.47)
CIE-LCH	lch(32.74, 66.54, 298.52°)
OKLab	oklab(43.29% 0.0098 -0.1686)
OKLCH	oklch(43.29% 0.169 273.3)
XYZ	xyz(10.7572, 7.4183, 39.3852)
Luminance	0.0742 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.96

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740AB #ABA237

analogous

#377AAB #3740AB #6837AB

triadic

#3740AB #AB3740 #40AB37

tetradic

#3740AB #AB377A #ABA237 #37AB68

square

#3740AB #AB377A #ABA237 #37AB68

split-complementary

#3740AB #AB6837 #7AAB37

monochromatic

#191D4E #282F7D #3740AB #565FC9 #858BD8

Accessibility & contrast

On white

8.45

#3740AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.48

#3740AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740AB

8.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740AB	#FFFFFF	#000000	##FFFFFF
##3740AB	1.00	8.45	2.48	8.45
#FFFFFF	8.45	1.00	21.00	1.00
#000000	2.48	21.00	1.00	21.00
##FFFFFF	8.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052AE

Deuteranopia (green-blind)

#0048A9

Tritanopia (blue-blind)

#005B6F

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3740ab;
/* rgb */ color: rgb(55, 64, 171);
/* oklch */ color: oklch(43.3% 0.169 273.3);

Tailwind

colors: {
  custom: {
    50: '#7c75c5',
    500: '#3740ab',
    950: '#000000',
  },
}

SCSS

$custom: #3740ab;
$custom-light: #7c75c5;
$custom-dark: #000000;

JSON

{
  "hex": "#3740ab",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 171
  },
  "hsl": {
    "h": 235.345,
    "s": 51.327,
    "l": 44.314
  },
  "oklch": {
    "l": 0.43292,
    "c": 0.16889,
    "h": 273.3
  },
  "luminance": 0.07419
}

Semantic roles & 50–950 ramp

primary

#3740AB

secondary

#C1BC7C

accent

#D04DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740AB

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

Preview Lab → · Contrast checker → · Palette generator →