#3781CC#3781CC

#3781CC is a mid, vivid cyan. Relative luminance 0.209; OKLCH L 59.3% C 0.136 H 251.5°. Best body text is #000000 at 5.17:1 contrast (WCAG AA passes).

Color values

HEX	#3781CC
RGB	rgb(55, 129, 204)
HSL	hsl(210, 59%, 51%)
HSV	hsv(210, 73%, 80%)
CMYK	cmyk(73%, 36.8%, 0%, 20%)
CIE-LAB	lab(52.81, 2.39, -45.40)
CIE-LCH	lch(52.81, 45.46, 273.02°)
OKLab	oklab(59.3% -0.0433 -0.1292)
OKLCH	oklch(59.3% 0.136 251.5)
XYZ	xyz(20.3208, 20.8701, 60.0724)
Luminance	0.2087 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3781CC #CC8237

analogous

#37CCCC #3781CC #3737CC

triadic

#3781CC #CC3781 #81CC37

tetradic

#3781CC #CC37CC #CC8237 #37CC37

square

#3781CC #CC37CC #CC8237 #37CC37

split-complementary

#3781CC #CC3737 #CCCC37

monochromatic

#1C446D #28639E #3781CC #68A0D8 #99BEE5

Accessibility & contrast

On white

4.06

#3781CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.17

#3781CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3781CC

5.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3781CC	#FFFFFF	#000000	##000000
##3781CC	1.00	4.06	5.17	5.17
#FFFFFF	4.06	1.00	21.00	21.00
#000000	5.17	21.00	1.00	1.00
##000000	5.17	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5F86CF

Deuteranopia (green-blind)

#4878CB

Tritanopia (blue-blind)

#00939D

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #3781cc;
/* rgb */ color: rgb(55, 129, 204);
/* oklch */ color: oklch(59.3% 0.136 251.5);

Tailwind

colors: {
  custom: {
    50: '#81a5dc',
    500: '#3781cc',
    950: '#000000',
  },
}

SCSS

$custom: #3781cc;
$custom-light: #81a5dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3781cc",
  "rgb": {
    "r": 55,
    "g": 129,
    "b": 204
  },
  "hsl": {
    "h": 210.201,
    "s": 59.363,
    "l": 50.784
  },
  "oklch": {
    "l": 0.59303,
    "c": 0.13629,
    "h": 251.5
  },
  "luminance": 0.20872
}

Semantic roles & 50–950 ramp

primary

#3781CC

secondary

#D0B08E

accent

#9445E3

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3781CC

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

Preview Lab → · Contrast checker → · Palette generator →