#3757B8#3757B8

#3757B8 is a mid, vivid blue. Relative luminance 0.111; OKLCH L 48.8% C 0.158 H 266.7°. Best body text is #FFFFFF at 6.53:1 contrast (WCAG AA passes).

Color values

HEX	#3757B8
RGB	rgb(55, 87, 184)
HSL	hsl(225, 54%, 47%)
HSV	hsv(225, 70%, 72%)
CMYK	cmyk(70.1%, 52.7%, 0%, 27.8%)
CIE-LAB	lab(39.73, 21.52, -54.81)
CIE-LCH	lch(39.73, 58.88, 291.44°)
OKLab	oklab(48.83% -0.0091 -0.1576)
OKLCH	oklch(48.83% 0.158 266.7)
XYZ	xyz(13.6325, 11.0879, 46.7598)
Luminance	0.1109 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757B8 #B89837

analogous

#3798B8 #3757B8 #5737B8

triadic

#3757B8 #B83757 #57B837

tetradic

#3757B8 #B83798 #B89837 #37B857

square

#3757B8 #B83798 #B89837 #37B857

split-complementary

#3757B8 #B85737 #98B837

monochromatic

#1B2A5A #294189 #3757B8 #5D7ACF #8DA0DD

Accessibility & contrast

On white

6.53

#3757B8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.22

#3757B8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757B8

6.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757B8	#FFFFFF	#000000	##FFFFFF
##3757B8	1.00	6.53	3.22	6.53
#FFFFFF	6.53	1.00	21.00	1.00
#000000	3.22	21.00	1.00	21.00
##FFFFFF	6.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1664BB

Deuteranopia (green-blind)

#0058B6

Tritanopia (blue-blind)

#006E7F

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3757b8;
/* rgb */ color: rgb(55, 87, 184);
/* oklch */ color: oklch(48.8% 0.158 266.7);

Tailwind

colors: {
  custom: {
    50: '#7e85ce',
    500: '#3757b8',
    950: '#000000',
  },
}

SCSS

$custom: #3757b8;
$custom-light: #7e85ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3757b8",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 184
  },
  "hsl": {
    "h": 225.116,
    "s": 53.975,
    "l": 46.863
  },
  "oklch": {
    "l": 0.48825,
    "c": 0.15784,
    "h": 266.7
  },
  "luminance": 0.11089
}

Semantic roles & 50–950 ramp

primary

#3757B8

secondary

#C7B684

accent

#B94ADD

background

#F8F8FC

surface

#EFEFF9

border

#CACAD2

text

#0B0B14

muted

#7C7C82

Preview Lab

Preview with #3757B8

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

Preview Lab → · Contrast checker → · Palette generator →