#3757C9#3757C9

#3757C9 is a mid, vivid blue. Relative luminance 0.118; OKLCH L 50.1% C 0.181 H 267.5°. Best body text is #FFFFFF at 6.23:1 contrast (WCAG AA passes).

Color values

HEX	#3757C9
RGB	rgb(55, 87, 201)
HSL	hsl(227, 57%, 50%)
HSV	hsv(227, 73%, 79%)
CMYK	cmyk(72.6%, 56.7%, 0%, 21.2%)
CIE-LAB	lab(40.97, 27.76, -62.70)
CIE-LCH	lch(40.97, 68.57, 293.88°)
OKLab	oklab(50.15% -0.0079 -0.1808)
OKLCH	oklch(50.15% 0.181 267.5)
XYZ	xyz(15.5227, 11.8440, 56.7151)
Luminance	0.1185 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757C9 #C9A937

analogous

#37A0C9 #3757C9 #6037C9

triadic

#3757C9 #C93757 #57C937

tetradic

#3757C9 #C937A0 #C9A937 #37C960

square

#3757C9 #C937A0 #C9A937 #37C960

split-complementary

#3757C9 #C96037 #A0C937

monochromatic

#1C2D69 #294299 #3757C9 #677FD6 #97A8E3

Accessibility & contrast

On white

6.23

#3757C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.37

#3757C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757C9

6.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757C9	#FFFFFF	#000000	##FFFFFF
##3757C9	1.00	6.23	3.37	6.23
#FFFFFF	6.23	1.00	21.00	1.00
#000000	3.37	21.00	1.00	21.00
##FFFFFF	6.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068CD

Deuteranopia (green-blind)

#005AC7

Tritanopia (blue-blind)

#007387

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #3757c9;
/* rgb */ color: rgb(55, 87, 201);
/* oklch */ color: oklch(50.1% 0.181 267.5);

Tailwind

colors: {
  custom: {
    50: '#8186da',
    500: '#3757c9',
    950: '#000000',
  },
}

SCSS

$custom: #3757c9;
$custom-light: #8186da;
$custom-dark: #000000;

JSON

{
  "hex": "#3757c9",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 201
  },
  "hsl": {
    "h": 226.849,
    "s": 57.48,
    "l": 50.196
  },
  "oklch": {
    "l": 0.5015,
    "c": 0.18096,
    "h": 267.5
  },
  "luminance": 0.11846
}

Semantic roles & 50–950 ramp

primary

#3757C9

secondary

#CFC08D

accent

#BF47E1

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3757C9

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

Preview Lab → · Contrast checker → · Palette generator →