#3751BC#3751BC

#3751BC is a mid, vivid blue. Relative luminance 0.103; OKLCH L 47.9% C 0.171 H 268.7°. Best body text is #FFFFFF at 6.85:1 contrast (WCAG AA passes).

Color values

HEX	#3751BC
RGB	rgb(55, 81, 188)
HSL	hsl(228, 55%, 48%)
HSV	hsv(228, 71%, 74%)
CMYK	cmyk(70.7%, 56.9%, 0%, 26.3%)
CIE-LAB	lab(38.42, 26.89, -59.27)
CIE-LCH	lch(38.42, 65.08, 294.40°)
OKLab	oklab(47.93% -0.0038 -0.1708)
OKLCH	oklch(47.93% 0.171 268.7)
XYZ	xyz(13.5920, 10.3266, 48.8441)
Luminance	0.1033 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3751BC #BCA237

analogous

#3793BC #3751BC #6037BC

triadic

#3751BC #BC3751 #51BC37

tetradic

#3751BC #BC3793 #BCA237 #37BC60

square

#3751BC #BC3793 #BCA237 #37BC60

split-complementary

#3751BC #BC6037 #93BC37

monochromatic

#1B285D #293D8D #3751BC #6076D0 #8F9FDE

Accessibility & contrast

On white

6.85

#3751BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#3751BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3751BC

6.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3751BC	#FFFFFF	#000000	##FFFFFF
##3751BC	1.00	6.85	3.07	6.85
#FFFFFF	6.85	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0061C0

Deuteranopia (green-blind)

#0055BA

Tritanopia (blue-blind)

#006B7E

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3751bc;
/* rgb */ color: rgb(55, 81, 188);
/* oklch */ color: oklch(47.9% 0.171 268.7);

Tailwind

colors: {
  custom: {
    50: '#7f81d1',
    500: '#3751bc',
    950: '#000000',
  },
}

SCSS

$custom: #3751bc;
$custom-light: #7f81d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3751bc",
  "rgb": {
    "r": 55,
    "g": 81,
    "b": 188
  },
  "hsl": {
    "h": 228.271,
    "s": 54.733,
    "l": 47.647
  },
  "oklch": {
    "l": 0.47934,
    "c": 0.17083,
    "h": 268.7
  },
  "luminance": 0.10328
}

Semantic roles & 50–950 ramp

primary

#3751BC

secondary

#C9BC86

accent

#C14ADE

background

#F8F7FC

surface

#EFEEF9

border

#CAC9D2

text

#0B0A14

muted

#7C7C82

Preview Lab

Preview with #3751BC

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

Preview Lab → · Contrast checker → · Palette generator →