#3751BB#3751BB

#3751BB is a mid, vivid blue. Relative luminance 0.103; OKLCH L 47.9% C 0.169 H 268.7°. Best body text is #FFFFFF at 6.87:1 contrast (WCAG AA passes).

Color values

HEX	#3751BB
RGB	rgb(55, 81, 187)
HSL	hsl(228, 55%, 47%)
HSV	hsv(228, 71%, 73%)
CMYK	cmyk(70.6%, 56.7%, 0%, 26.7%)
CIE-LAB	lab(38.35, 26.52, -58.81)
CIE-LCH	lch(38.35, 64.51, 294.28°)
OKLab	oklab(47.85% -0.0038 -0.1694)
OKLCH	oklch(47.85% 0.169 268.7)
XYZ	xyz(13.4845, 10.2836, 48.2784)
Luminance	0.1028 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3751BB #BBA137

analogous

#3793BB #3751BB #5F37BB

triadic

#3751BB #BB3751 #51BB37

tetradic

#3751BB #BB3793 #BBA137 #37BB5F

square

#3751BB #BB3793 #BBA137 #37BB5F

split-complementary

#3751BB #BB5F37 #93BB37

monochromatic

#1B285C #293D8C #3751BB #5F75D0 #8E9EDE

Accessibility & contrast

On white

6.87

#3751BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.06

#3751BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3751BB

6.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3751BB	#FFFFFF	#000000	##FFFFFF
##3751BB	1.00	6.87	3.06	6.87
#FFFFFF	6.87	1.00	21.00	1.00
#000000	3.06	21.00	1.00	21.00
##FFFFFF	6.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0061BF

Deuteranopia (green-blind)

#0054B9

Tritanopia (blue-blind)

#006B7E

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3751bb;
/* rgb */ color: rgb(55, 81, 187);
/* oklch */ color: oklch(47.9% 0.169 268.7);

Tailwind

colors: {
  custom: {
    50: '#7f81d0',
    500: '#3751bb',
    950: '#000000',
  },
}

SCSS

$custom: #3751bb;
$custom-light: #7f81d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3751bb",
  "rgb": {
    "r": 55,
    "g": 81,
    "b": 187
  },
  "hsl": {
    "h": 228.182,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.47853,
    "c": 0.16946,
    "h": 268.7
  },
  "luminance": 0.10285
}

Semantic roles & 50–950 ramp

primary

#3751BB

secondary

#C9BB85

accent

#C14ADE

background

#F8F7FC

surface

#EFEEF9

border

#CAC9D2

text

#0B0A14

muted

#7C7C82

Preview Lab

Preview with #3751BB

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

Preview Lab → · Contrast checker → · Palette generator →