#3781BB#3781BB

#3781BB is a mid, moderate cyan. Relative luminance 0.201; OKLCH L 58.3% C 0.115 H 245.4°. Best body text is #000000 at 5.02:1 contrast (WCAG AA passes).

Color values

HEX	#3781BB
RGB	rgb(55, 129, 187)
HSL	hsl(206, 55%, 47%)
HSV	hsv(206, 71%, 73%)
CMYK	cmyk(70.6%, 31%, 0%, 26.7%)
CIE-LAB	lab(51.95, -3.68, -37.06)
CIE-LCH	lch(51.95, 37.24, 264.33°)
OKLab	oklab(58.35% -0.048 -0.1049)
OKLCH	oklch(58.35% 0.115 245.4)
XYZ	xyz(18.3920, 20.0986, 49.9142)
Luminance	0.2010 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3781BB #BB7137

analogous

#37BBB3 #3781BB #373FBB

triadic

#3781BB #BB3781 #81BB37

tetradic

#3781BB #B337BB #BB7137 #3FBB37

square

#3781BB #B337BB #BB7137 #3FBB37

split-complementary

#3781BB #BB373F #BBB337

monochromatic

#1B405C #29608C #3781BB #5F9ED0 #8EBBDE

Accessibility & contrast

On white

4.18

#3781BB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.02

#3781BB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3781BB

5.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3781BB	#FFFFFF	#000000	##000000
##3781BB	1.00	4.18	5.02	5.02
#FFFFFF	4.18	1.00	21.00	21.00
#000000	5.02	21.00	1.00	1.00
##000000	5.02	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6783BE

Deuteranopia (green-blind)

#5476BA

Tritanopia (blue-blind)

#008F96

Achromatopsia (no color)

#7C7C7C

Design tokens & code

CSS

--color: #3781bb;
/* rgb */ color: rgb(55, 129, 187);
/* oklch */ color: oklch(58.3% 0.115 245.4);

Tailwind

colors: {
  custom: {
    50: '#7ea5cf',
    500: '#3781bb',
    950: '#000000',
  },
}

SCSS

$custom: #3781bb;
$custom-light: #7ea5cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3781bb",
  "rgb": {
    "r": 55,
    "g": 129,
    "b": 187
  },
  "hsl": {
    "h": 206.364,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.58347,
    "c": 0.11535,
    "h": 245.4
  },
  "luminance": 0.20101
}

Semantic roles & 50–950 ramp

primary

#3781BB

secondary

#C9A385

accent

#8B4ADE

background

#F8FAFC

surface

#EFF4F9

border

#CACED2

text

#0B0F14

muted

#7C7F82

Preview Lab

Preview with #3781BB

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

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