#3742AB#3742AB

#3742AB is a dark, vivid blue. Relative luminance 0.076; OKLCH L 43.7% C 0.166 H 272.8°. Best body text is #FFFFFF at 8.30:1 contrast (WCAG AA passes).

Color values

HEX	#3742AB
RGB	rgb(55, 66, 171)
HSL	hsl(234, 51%, 44%)
HSV	hsv(234, 68%, 67%)
CMYK	cmyk(67.8%, 61.4%, 0%, 32.9%)
CIE-LAB	lab(33.24, 30.48, -57.65)
CIE-LCH	lch(33.24, 65.21, 297.86°)
OKLab	oklab(43.66% 0.0082 -0.1662)
OKLCH	oklch(43.66% 0.166 272.8)
XYZ	xyz(10.8720, 7.6479, 39.4234)
Luminance	0.0765 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.22

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3742AB #ABA037

analogous

#377CAB #3742AB #6637AB

triadic

#3742AB #AB3742 #42AB37

tetradic

#3742AB #AB377C #ABA037 #37AB66

square

#3742AB #AB377C #ABA037 #37AB66

split-complementary

#3742AB #AB6637 #7CAB37

monochromatic

#191E4E #28307D #3742AB #5661C9 #858DD8

Accessibility & contrast

On white

8.30

#3742AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.53

#3742AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3742AB

8.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3742AB	#FFFFFF	#000000	##FFFFFF
##3742AB	1.00	8.30	2.53	8.30
#FFFFFF	8.30	1.00	21.00	1.00
#000000	2.53	21.00	1.00	21.00
##FFFFFF	8.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054AE

Deuteranopia (green-blind)

#0049A9

Tritanopia (blue-blind)

#005C70

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3742ab;
/* rgb */ color: rgb(55, 66, 171);
/* oklch */ color: oklch(43.7% 0.166 272.8);

Tailwind

colors: {
  custom: {
    50: '#7c76c5',
    500: '#3742ab',
    950: '#000000',
  },
}

SCSS

$custom: #3742ab;
$custom-light: #7c76c5;
$custom-dark: #000000;

JSON

{
  "hex": "#3742ab",
  "rgb": {
    "r": 55,
    "g": 66,
    "b": 171
  },
  "hsl": {
    "h": 234.31,
    "s": 51.327,
    "l": 44.314
  },
  "oklch": {
    "l": 0.43659,
    "c": 0.16641,
    "h": 272.8
  },
  "luminance": 0.07649
}

Semantic roles & 50–950 ramp

primary

#3742AB

secondary

#C1BB7C

accent

#CD4DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3742AB

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

Preview Lab → · Contrast checker → · Palette generator →