#3740AD#3740AD

#3740AD is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.5% C 0.172 H 273.2°. Best body text is #FFFFFF at 8.40:1 contrast (WCAG AA passes).

Color values

HEX	#3740AD
RGB	rgb(55, 64, 173)
HSL	hsl(235, 52%, 45%)
HSV	hsv(235, 68%, 68%)
CMYK	cmyk(68.2%, 63%, 0%, 32.2%)
CIE-LAB	lab(32.91, 32.48, -59.39)
CIE-LCH	lch(32.91, 67.69, 298.67°)
OKLab	oklab(43.47% 0.0097 -0.1713)
OKLCH	oklch(43.47% 0.172 273.2)
XYZ	xyz(10.9493, 7.4951, 40.3967)
Luminance	0.0750 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.74

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740AD #ADA437

analogous

#377BAD #3740AD #6937AD

triadic

#3740AD #AD3740 #40AD37

tetradic

#3740AD #AD377B #ADA437 #37AD69

square

#3740AD #AD377B #ADA437 #37AD69

split-complementary

#3740AD #AD6937 #7BAD37

monochromatic

#191E50 #282F7F #3740AD #5760CA #868CD8

Accessibility & contrast

On white

8.40

#3740AD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.50

#3740AD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740AD

8.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740AD	#FFFFFF	#000000	##FFFFFF
##3740AD	1.00	8.40	2.50	8.40
#FFFFFF	8.40	1.00	21.00	1.00
#000000	2.50	21.00	1.00	21.00
##FFFFFF	8.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B1

Deuteranopia (green-blind)

#0048AB

Tritanopia (blue-blind)

#005C70

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3740ad;
/* rgb */ color: rgb(55, 64, 173);
/* oklch */ color: oklch(43.5% 0.172 273.2);

Tailwind

colors: {
  custom: {
    50: '#7d75c6',
    500: '#3740ad',
    950: '#000000',
  },
}

SCSS

$custom: #3740ad;
$custom-light: #7d75c6;
$custom-dark: #000000;

JSON

{
  "hex": "#3740ad",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 173
  },
  "hsl": {
    "h": 235.424,
    "s": 51.754,
    "l": 44.706
  },
  "oklch": {
    "l": 0.43467,
    "c": 0.17158,
    "h": 273.2
  },
  "luminance": 0.07496
}

Semantic roles & 50–950 ramp

primary

#3740AD

secondary

#C2BD7D

accent

#D04DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740AD

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

Preview Lab → · Contrast checker → · Palette generator →