#3740AC#3740AC

#3740AC is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.4% C 0.170 H 273.3°. Best body text is #FFFFFF at 8.43:1 contrast (WCAG AA passes).

Color values

HEX	#3740AC
RGB	rgb(55, 64, 172)
HSL	hsl(235, 52%, 45%)
HSV	hsv(235, 68%, 67%)
CMYK	cmyk(68%, 62.8%, 0%, 32.5%)
CIE-LAB	lab(32.82, 32.12, -58.93)
CIE-LCH	lch(32.82, 67.11, 298.59°)
OKLab	oklab(43.38% 0.0098 -0.17)
OKLCH	oklch(43.38% 0.17 273.3)
XYZ	xyz(10.8529, 7.4566, 39.8890)
Luminance	0.0746 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.85

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740AC #ACA337

analogous

#377AAC #3740AC #6937AC

triadic

#3740AC #AC3740 #40AC37

tetradic

#3740AC #AC377A #ACA337 #37AC69

square

#3740AC #AC377A #ACA337 #37AC69

split-complementary

#3740AC #AC6937 #7AAC37

monochromatic

#191D4F #282F7E #3740AC #5760C9 #858CD8

Accessibility & contrast

On white

8.43

#3740AC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.49

#3740AC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740AC

8.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740AC	#FFFFFF	#000000	##FFFFFF
##3740AC	1.00	8.43	2.49	8.43
#FFFFFF	8.43	1.00	21.00	1.00
#000000	2.49	21.00	1.00	21.00
##FFFFFF	8.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053AF

Deuteranopia (green-blind)

#0048AA

Tritanopia (blue-blind)

#005B70

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3740ac;
/* rgb */ color: rgb(55, 64, 172);
/* oklch */ color: oklch(43.4% 0.170 273.3);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#3740ac",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 172
  },
  "hsl": {
    "h": 235.385,
    "s": 51.542,
    "l": 44.51
  },
  "oklch": {
    "l": 0.43379,
    "c": 0.17024,
    "h": 273.3
  },
  "luminance": 0.07458
}

Semantic roles & 50–950 ramp

primary

#3740AC

secondary

#C2BD7D

accent

#D04DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740AC

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

Preview Lab → · Contrast checker → · Palette generator →