#3747B9#3747B9

#3747B9 is a mid, vivid blue. Relative luminance 0.088; OKLCH L 45.8% C 0.179 H 271.3°. Best body text is #FFFFFF at 7.60:1 contrast (WCAG AA passes).

Color values

HEX	#3747B9
RGB	rgb(55, 71, 185)
HSL	hsl(233, 54%, 47%)
HSV	hsv(233, 70%, 73%)
CMYK	cmyk(70.3%, 61.6%, 0%, 27.5%)
CIE-LAB	lab(35.64, 32.26, -62.05)
CIE-LCH	lch(35.64, 69.93, 297.47°)
OKLab	oklab(45.79% 0.0039 -0.1791)
OKLCH	oklch(45.79% 0.179 271.3)
XYZ	xyz(12.5828, 8.8202, 46.9289)
Luminance	0.0882 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.79

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3747B9 #B9A937

analogous

#3788B9 #3747B9 #6837B9

triadic

#3747B9 #B93747 #47B937

tetradic

#3747B9 #B93788 #B9A937 #37B968

square

#3747B9 #B93788 #B9A937 #37B968

split-complementary

#3747B9 #B96837 #88B937

monochromatic

#1B235B #29358A #3747B9 #5E6CCF #8D97DD

Accessibility & contrast

On white

7.60

#3747B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.76

#3747B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3747B9

7.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3747B9	#FFFFFF	#000000	##FFFFFF
##3747B9	1.00	7.60	2.76	7.60
#FFFFFF	7.60	1.00	21.00	1.00
#000000	2.76	21.00	1.00	21.00
##FFFFFF	7.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ABD

Deuteranopia (green-blind)

#004EB7

Tritanopia (blue-blind)

#006479

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3747b9;
/* rgb */ color: rgb(55, 71, 185);
/* oklch */ color: oklch(45.8% 0.179 271.3);

Tailwind

colors: {
  custom: {
    50: '#7f7acf',
    500: '#3747b9',
    950: '#000000',
  },
}

SCSS

$custom: #3747b9;
$custom-light: #7f7acf;
$custom-dark: #000000;

JSON

{
  "hex": "#3747b9",
  "rgb": {
    "r": 55,
    "g": 71,
    "b": 185
  },
  "hsl": {
    "h": 232.615,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.45787,
    "c": 0.1791,
    "h": 271.3
  },
  "luminance": 0.08821
}

Semantic roles & 50–950 ramp

primary

#3747B9

secondary

#C8BF84

accent

#CB4ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0B0914

muted

#7C7B82

Preview Lab

Preview with #3747B9

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

Preview Lab → · Contrast checker → · Palette generator →