#3757BB#3757BB

#3757BB is a mid, vivid blue. Relative luminance 0.112; OKLCH L 49.1% C 0.162 H 266.9°. Best body text is #FFFFFF at 6.48:1 contrast (WCAG AA passes).

Color values

HEX	#3757BB
RGB	rgb(55, 87, 187)
HSL	hsl(225, 55%, 47%)
HSV	hsv(225, 71%, 73%)
CMYK	cmyk(70.6%, 53.5%, 0%, 26.7%)
CIE-LAB	lab(39.94, 22.62, -56.22)
CIE-LCH	lch(39.94, 60.60, 291.92°)
OKLab	oklab(49.05% -0.0088 -0.1617)
OKLCH	oklch(49.05% 0.162 266.9)
XYZ	xyz(13.9503, 11.2151, 48.4336)
Luminance	0.1122 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757BB #BB9B37

analogous

#3799BB #3757BB #5937BB

triadic

#3757BB #BB3757 #57BB37

tetradic

#3757BB #BB3799 #BB9B37 #37BB59

square

#3757BB #BB3799 #BB9B37 #37BB59

split-complementary

#3757BB #BB5937 #99BB37

monochromatic

#1B2B5C #29418C #3757BB #5F7BD0 #8EA2DE

Accessibility & contrast

On white

6.48

#3757BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.24

#3757BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757BB

6.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757BB	#FFFFFF	#000000	##FFFFFF
##3757BB	1.00	6.48	3.24	6.48
#FFFFFF	6.48	1.00	21.00	1.00
#000000	3.24	21.00	1.00	21.00
##FFFFFF	6.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E64BF

Deuteranopia (green-blind)

#0058B9

Tritanopia (blue-blind)

#006F80

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3757bb;
/* rgb */ color: rgb(55, 87, 187);
/* oklch */ color: oklch(49.1% 0.162 266.9);

Tailwind

colors: {
  custom: {
    50: '#7e85d0',
    500: '#3757bb',
    950: '#000000',
  },
}

SCSS

$custom: #3757bb;
$custom-light: #7e85d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3757bb",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 187
  },
  "hsl": {
    "h": 225.455,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.49053,
    "c": 0.16198,
    "h": 266.9
  },
  "luminance": 0.11216
}

Semantic roles & 50–950 ramp

primary

#3757BB

secondary

#C9B885

accent

#BA4ADE

background

#F8F8FC

surface

#EFEFF9

border

#CACAD2

text

#0B0B14

muted

#7C7C82

Preview Lab

Preview with #3757BB

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

Preview Lab → · Contrast checker → · Palette generator →