#3757A9#3757A9

#3757A9 is a mid, vivid blue. Relative luminance 0.105; OKLCH L 47.7% C 0.137 H 265.5°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#3757A9
RGB	rgb(55, 87, 169)
HSL	hsl(223, 51%, 44%)
HSV	hsv(223, 67%, 66%)
CMYK	cmyk(67.5%, 48.5%, 0%, 33.7%)
CIE-LAB	lab(38.71, 16.00, -47.60)
CIE-LCH	lch(38.71, 50.22, 288.58°)
OKLab	oklab(47.73% -0.0108 -0.1364)
OKLCH	oklch(47.73% 0.137 265.5)
XYZ	xyz(12.1427, 10.4920, 38.9137)
Luminance	0.1049 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757A9 #A98937

analogous

#3790A9 #3757A9 #5037A9

triadic

#3757A9 #A93757 #57A937

tetradic

#3757A9 #A93790 #A98937 #37A950

square

#3757A9 #A93790 #A98937 #37A950

split-complementary

#3757A9 #A95037 #90A937

monochromatic

#19274D #283F7B #3757A9 #5576C8 #849BD7

Accessibility & contrast

On white

6.78

#3757A9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#3757A9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757A9

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757A9	#FFFFFF	#000000	##FFFFFF
##3757A9	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C61AC

Deuteranopia (green-blind)

#1156A7

Tritanopia (blue-blind)

#006A78

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3757a9;
/* rgb */ color: rgb(55, 87, 169);
/* oklch */ color: oklch(47.7% 0.137 265.5);

Tailwind

colors: {
  custom: {
    50: '#7b85c3',
    500: '#3757a9',
    950: '#000000',
  },
}

SCSS

$custom: #3757a9;
$custom-light: #7b85c3;
$custom-dark: #000000;

JSON

{
  "hex": "#3757a9",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 169
  },
  "hsl": {
    "h": 223.158,
    "s": 50.893,
    "l": 43.922
  },
  "oklch": {
    "l": 0.47727,
    "c": 0.13679,
    "h": 265.5
  },
  "luminance": 0.10493
}

Semantic roles & 50–950 ramp

primary

#3757A9

secondary

#C0AD7B

accent

#B34DDA

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B12

muted

#7C7C81

Preview Lab

Preview with #3757A9

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

Preview Lab → · Contrast checker → · Palette generator →