#3749AB#3749AB

#3749AB is a dark, vivid blue. Relative luminance 0.085; OKLCH L 45.0% C 0.158 H 270.8°. Best body text is #FFFFFF at 7.77:1 contrast (WCAG AA passes).

Color values

HEX	#3749AB
RGB	rgb(55, 73, 171)
HSL	hsl(231, 51%, 44%)
HSV	hsv(231, 68%, 67%)
CMYK	cmyk(67.8%, 57.3%, 0%, 32.9%)
CIE-LAB	lab(35.04, 25.92, -54.73)
CIE-LCH	lch(35.04, 60.56, 295.34°)
OKLab	oklab(44.99% 0.0023 -0.1575)
OKLCH	oklch(44.99% 0.158 270.8)
XYZ	xyz(11.3063, 8.5165, 39.5682)
Luminance	0.0852 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3749AB #AB9937

analogous

#3783AB #3749AB #5F37AB

triadic

#3749AB #AB3749 #49AB37

tetradic

#3749AB #AB3783 #AB9937 #37AB5F

square

#3749AB #AB3783 #AB9937 #37AB5F

split-complementary

#3749AB #AB5F37 #83AB37

monochromatic

#19214E #28357D #3749AB #5668C9 #8592D8

Accessibility & contrast

On white

7.77

#3749AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.70

#3749AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3749AB

7.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3749AB	#FFFFFF	#000000	##FFFFFF
##3749AB	1.00	7.77	2.70	7.77
#FFFFFF	7.77	1.00	21.00	1.00
#000000	2.70	21.00	1.00	21.00
##FFFFFF	7.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058AE

Deuteranopia (green-blind)

#004DA9

Tritanopia (blue-blind)

#006173

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3749ab;
/* rgb */ color: rgb(55, 73, 171);
/* oklch */ color: oklch(45.0% 0.158 270.8);

Tailwind

colors: {
  custom: {
    50: '#7c7bc5',
    500: '#3749ab',
    950: '#000000',
  },
}

SCSS

$custom: #3749ab;
$custom-light: #7c7bc5;
$custom-dark: #000000;

JSON

{
  "hex": "#3749ab",
  "rgb": {
    "r": 55,
    "g": 73,
    "b": 171
  },
  "hsl": {
    "h": 230.69,
    "s": 51.327,
    "l": 44.314
  },
  "oklch": {
    "l": 0.44994,
    "c": 0.15756,
    "h": 270.8
  },
  "luminance": 0.08518
}

Semantic roles & 50–950 ramp

primary

#3749AB

secondary

#C1B77C

accent

#C54DDB

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #3749AB

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

Preview Lab → · Contrast checker → · Palette generator →