#3740AA#3740AA

#3740AA is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.2% C 0.168 H 273.4°. Best body text is #FFFFFF at 8.48:1 contrast (WCAG AA passes).

Color values

HEX	#3740AA
RGB	rgb(55, 64, 170)
HSL	hsl(235, 51%, 44%)
HSV	hsv(235, 68%, 67%)
CMYK	cmyk(67.6%, 62.4%, 0%, 33.3%)
CIE-LAB	lab(32.66, 31.41, -58.00)
CIE-LCH	lch(32.66, 65.96, 298.44°)
OKLab	oklab(43.2% 0.0098 -0.1673)
OKLCH	oklch(43.2% 0.168 273.4)
XYZ	xyz(10.6622, 7.3803, 38.8851)
Luminance	0.0738 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740AA #AAA137

analogous

#377AAA #3740AA #6837AA

triadic

#3740AA #AA3740 #40AA37

tetradic

#3740AA #AA377A #AAA137 #37AA68

square

#3740AA #AA377A #AAA137 #37AA68

split-complementary

#3740AA #AA6837 #7AAA37

monochromatic

#191D4E #282F7C #3740AA #565FC8 #848BD7

Accessibility & contrast

On white

8.48

#3740AA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.48

#3740AA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740AA

8.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740AA	#FFFFFF	#000000	##FFFFFF
##3740AA	1.00	8.48	2.48	8.48
#FFFFFF	8.48	1.00	21.00	1.00
#000000	2.48	21.00	1.00	21.00
##FFFFFF	8.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052AD

Deuteranopia (green-blind)

#0048A8

Tritanopia (blue-blind)

#005B6F

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3740aa;
/* rgb */ color: rgb(55, 64, 170);
/* oklch */ color: oklch(43.2% 0.168 273.4);

Tailwind

colors: {
  custom: {
    50: '#7c75c4',
    500: '#3740aa',
    950: '#000000',
  },
}

SCSS

$custom: #3740aa;
$custom-light: #7c75c4;
$custom-dark: #000000;

JSON

{
  "hex": "#3740aa",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 170
  },
  "hsl": {
    "h": 235.304,
    "s": 51.111,
    "l": 44.118
  },
  "oklch": {
    "l": 0.43204,
    "c": 0.16755,
    "h": 273.4
  },
  "luminance": 0.07381
}

Semantic roles & 50–950 ramp

primary

#3740AA

secondary

#C1BC7C

accent

#D04DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3740AA

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

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