#3757B9#3757B9

#3757B9 is a mid, vivid blue. Relative luminance 0.111; OKLCH L 48.9% C 0.159 H 266.8°. Best body text is #FFFFFF at 6.51:1 contrast (WCAG AA passes).

Color values

HEX	#3757B9
RGB	rgb(55, 87, 185)
HSL	hsl(225, 54%, 47%)
HSV	hsv(225, 70%, 73%)
CMYK	cmyk(70.3%, 53%, 0%, 27.5%)
CIE-LAB	lab(39.80, 21.89, -55.28)
CIE-LCH	lch(39.80, 59.46, 291.60°)
OKLab	oklab(48.9% -0.009 -0.159)
OKLCH	oklch(48.9% 0.159 266.8)
XYZ	xyz(13.7377, 11.1300, 47.3139)
Luminance	0.1113 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757B9 #B99937

analogous

#3798B9 #3757B9 #5837B9

triadic

#3757B9 #B93757 #57B937

tetradic

#3757B9 #B93798 #B99937 #37B958

square

#3757B9 #B93798 #B99937 #37B958

split-complementary

#3757B9 #B95837 #98B937

monochromatic

#1B2B5B #29418A #3757B9 #5E7ACF #8DA1DD

Accessibility & contrast

On white

6.51

#3757B9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.23

#3757B9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757B9

6.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757B9	#FFFFFF	#000000	##FFFFFF
##3757B9	1.00	6.51	3.23	6.51
#FFFFFF	6.51	1.00	21.00	1.00
#000000	3.23	21.00	1.00	21.00
##FFFFFF	6.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1364BC

Deuteranopia (green-blind)

#0058B7

Tritanopia (blue-blind)

#006E7F

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3757b9;
/* rgb */ color: rgb(55, 87, 185);
/* oklch */ color: oklch(48.9% 0.159 266.8);

Tailwind

colors: {
  custom: {
    50: '#7e85cf',
    500: '#3757b9',
    950: '#000000',
  },
}

SCSS

$custom: #3757b9;
$custom-light: #7e85cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3757b9",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 185
  },
  "hsl": {
    "h": 225.231,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.489,
    "c": 0.15922,
    "h": 266.8
  },
  "luminance": 0.11131
}

Semantic roles & 50–950 ramp

primary

#3757B9

secondary

#C8B784

accent

#B94ADE

background

#F8F8FC

surface

#EFEFF9

border

#CACAD2

text

#0B0B14

muted

#7C7C82

Preview Lab

Preview with #3757B9

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

Preview Lab → · Contrast checker → · Palette generator →