#3748A0#3748A0

#3748A0 is a dark, vivid blue. Relative luminance 0.080; OKLCH L 43.9% C 0.143 H 271.1°. Best body text is #FFFFFF at 8.09:1 contrast (WCAG AA passes).

Color values

HEX	#3748A0
RGB	rgb(55, 72, 160)
HSL	hsl(230, 49%, 42%)
HSV	hsv(230, 66%, 63%)
CMYK	cmyk(65.6%, 55%, 0%, 37.3%)
CIE-LAB	lab(33.95, 22.58, -49.90)
CIE-LCH	lch(33.95, 54.77, 294.35°)
OKLab	oklab(43.92% 0.0027 -0.1433)
OKLCH	oklch(43.92% 0.143 271.1)
XYZ	xyz(10.2359, 7.9841, 34.2526)
Luminance	0.0799 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3748A0 #A08F37

analogous

#377CA0 #3748A0 #5B37A0

triadic

#3748A0 #A03748 #48A037

tetradic

#3748A0 #A0377C #A08F37 #37A05B

square

#3748A0 #A0377C #A08F37 #37A05B

split-complementary

#3748A0 #A05B37 #7CA037

monochromatic

#181F45 #273472 #3748A0 #5163C3 #7F8CD3

Accessibility & contrast

On white

8.09

#3748A0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#3748A0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3748A0

8.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3748A0	#FFFFFF	#000000	##FFFFFF
##3748A0	1.00	8.09	2.60	8.09
#FFFFFF	8.09	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0755A3

Deuteranopia (green-blind)

#004B9E

Tritanopia (blue-blind)

#005D6D

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3748a0;
/* rgb */ color: rgb(55, 72, 160);
/* oklch */ color: oklch(43.9% 0.143 271.1);

Tailwind

colors: {
  custom: {
    50: '#7a7abd',
    500: '#3748a0',
    950: '#000000',
  },
}

SCSS

$custom: #3748a0;
$custom-light: #7a7abd;
$custom-dark: #000000;

JSON

{
  "hex": "#3748a0",
  "rgb": {
    "r": 55,
    "g": 72,
    "b": 160
  },
  "hsl": {
    "h": 230.286,
    "s": 48.837,
    "l": 42.157
  },
  "oklch": {
    "l": 0.43921,
    "c": 0.14338,
    "h": 271.1
  },
  "luminance": 0.07985
}

Semantic roles & 50–950 ramp

primary

#3748A0

secondary

#BCB177

accent

#C24FD8

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#0A0912

muted

#7C7B81

Preview Lab

Preview with #3748A0

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

Preview Lab → · Contrast checker → · Palette generator →