#3748AB#3748AB

#3748AB is a dark, vivid blue. Relative luminance 0.084; OKLCH L 44.8% C 0.159 H 271.1°. Best body text is #FFFFFF at 7.84:1 contrast (WCAG AA passes).

Color values

HEX	#3748AB
RGB	rgb(55, 72, 171)
HSL	hsl(231, 51%, 44%)
HSV	hsv(231, 68%, 67%)
CMYK	cmyk(67.8%, 57.9%, 0%, 32.9%)
CIE-LAB	lab(34.77, 26.57, -55.15)
CIE-LCH	lch(34.77, 61.22, 295.73°)
OKLab	oklab(44.8% 0.0032 -0.1588)
OKLCH	oklch(44.8% 0.159 271.1)
XYZ	xyz(11.2411, 8.3862, 39.5465)
Luminance	0.0839 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3748AB #AB9A37

analogous

#3782AB #3748AB #6037AB

triadic

#3748AB #AB3748 #48AB37

tetradic

#3748AB #AB3782 #AB9A37 #37AB60

square

#3748AB #AB3782 #AB9A37 #37AB60

split-complementary

#3748AB #AB6037 #82AB37

monochromatic

#19214E #28357D #3748AB #5667C9 #8591D8

Accessibility & contrast

On white

7.84

#3748AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#3748AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3748AB

7.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3748AB	#FFFFFF	#000000	##FFFFFF
##3748AB	1.00	7.84	2.68	7.84
#FFFFFF	7.84	1.00	21.00	1.00
#000000	2.68	21.00	1.00	21.00
##FFFFFF	7.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057AE

Deuteranopia (green-blind)

#004DA9

Tritanopia (blue-blind)

#006072

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3748ab;
/* rgb */ color: rgb(55, 72, 171);
/* oklch */ color: oklch(44.8% 0.159 271.1);

Tailwind

colors: {
  custom: {
    50: '#7c7ac5',
    500: '#3748ab',
    950: '#000000',
  },
}

SCSS

$custom: #3748ab;
$custom-light: #7c7ac5;
$custom-dark: #000000;

JSON

{
  "hex": "#3748ab",
  "rgb": {
    "r": 55,
    "g": 72,
    "b": 171
  },
  "hsl": {
    "h": 231.207,
    "s": 51.327,
    "l": 44.314
  },
  "oklch": {
    "l": 0.44799,
    "c": 0.15883,
    "h": 271.1
  },
  "luminance": 0.08387
}

Semantic roles & 50–950 ramp

primary

#3748AB

secondary

#C1B77C

accent

#C64DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #3748AB

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

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