#3748B8#3748B8

#3748B8 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 45.9% C 0.177 H 271.0°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#3748B8
RGB	rgb(55, 72, 184)
HSL	hsl(232, 54%, 47%)
HSV	hsv(232, 70%, 72%)
CMYK	cmyk(70.1%, 60.9%, 0%, 27.8%)
CIE-LAB	lab(35.80, 31.26, -61.18)
CIE-LCH	lch(35.80, 68.71, 297.06°)
OKLab	oklab(45.89% 0.0032 -0.1765)
OKLCH	oklch(45.89% 0.177 271)
XYZ	xyz(12.5417, 8.9064, 46.3963)
Luminance	0.0891 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3748B8 #B8A737

analogous

#3789B8 #3748B8 #6737B8

triadic

#3748B8 #B83748 #48B837

tetradic

#3748B8 #B83789 #B8A737 #37B867

square

#3748B8 #B83789 #B8A737 #37B867

split-complementary

#3748B8 #B86737 #89B837

monochromatic

#1B235A #293689 #3748B8 #5D6CCF #8D97DD

Accessibility & contrast

On white

7.55

#3748B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3748B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3748B8

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3748B8	#FFFFFF	#000000	##FFFFFF
##3748B8	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ABC

Deuteranopia (green-blind)

#004EB6

Tritanopia (blue-blind)

#006479

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3748b8;
/* rgb */ color: rgb(55, 72, 184);
/* oklch */ color: oklch(45.9% 0.177 271.0);

Tailwind

colors: {
  custom: {
    50: '#7f7bce',
    500: '#3748b8',
    950: '#000000',
  },
}

SCSS

$custom: #3748b8;
$custom-light: #7f7bce;
$custom-dark: #000000;

JSON

{
  "hex": "#3748b8",
  "rgb": {
    "r": 55,
    "g": 72,
    "b": 184
  },
  "hsl": {
    "h": 232.093,
    "s": 53.975,
    "l": 46.863
  },
  "oklch": {
    "l": 0.45886,
    "c": 0.17655,
    "h": 271
  },
  "luminance": 0.08908
}

Semantic roles & 50–950 ramp

primary

#3748B8

secondary

#C7BE84

accent

#CA4ADD

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0914

muted

#7C7B82

Preview Lab

Preview with #3748B8

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

Preview Lab → · Contrast checker → · Palette generator →