#3781B7#3781B7

#3781B7 is a mid, moderate cyan. Relative luminance 0.199; OKLCH L 58.1% C 0.111 H 243.6°. Best body text is #000000 at 4.99:1 contrast (WCAG AA passes).

Color values

HEX	#3781B7
RGB	rgb(55, 129, 183)
HSL	hsl(205, 54%, 47%)
HSV	hsv(205, 70%, 72%)
CMYK	cmyk(69.9%, 29.5%, 0%, 28.2%)
CIE-LAB	lab(51.76, -5.09, -35.06)
CIE-LCH	lch(51.76, 35.43, 261.74°)
OKLab	oklab(58.13% -0.0492 -0.0991)
OKLCH	oklch(58.13% 0.111 243.6)
XYZ	xyz(17.9698, 19.9297, 47.6903)
Luminance	0.1993 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3781B7 #B76D37

analogous

#37B7AD #3781B7 #3741B7

triadic

#3781B7 #B73781 #81B737

tetradic

#3781B7 #AD37B7 #B76D37 #41B737

square

#3781B7 #AD37B7 #B76D37 #41B737

split-complementary

#3781B7 #B73741 #B7AD37

monochromatic

#1B3F59 #296088 #3781B7 #5D9ECE #8CBADC

Accessibility & contrast

On white

4.21

#3781B7 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.99

#3781B7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3781B7

4.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3781B7	#FFFFFF	#000000	##000000
##3781B7	1.00	4.21	4.99	4.99
#FFFFFF	4.21	1.00	21.00	21.00
#000000	4.99	21.00	1.00	1.00
##000000	4.99	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6982B9

Deuteranopia (green-blind)

#5776B6

Tritanopia (blue-blind)

#008E94

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #3781b7;
/* rgb */ color: rgb(55, 129, 183);
/* oklch */ color: oklch(58.1% 0.111 243.6);

Tailwind

colors: {
  custom: {
    50: '#7da5cd',
    500: '#3781b7',
    950: '#000000',
  },
}

SCSS

$custom: #3781b7;
$custom-light: #7da5cd;
$custom-dark: #000000;

JSON

{
  "hex": "#3781b7",
  "rgb": {
    "r": 55,
    "g": 129,
    "b": 183
  },
  "hsl": {
    "h": 205.313,
    "s": 53.782,
    "l": 46.667
  },
  "oklch": {
    "l": 0.58134,
    "c": 0.11063,
    "h": 243.6
  },
  "luminance": 0.19932
}

Semantic roles & 50–950 ramp

primary

#3781B7

secondary

#C7A083

accent

#884BDD

background

#F8FAFC

surface

#EFF4F9

border

#CACED2

text

#0B0F13

muted

#7C7F82

Preview Lab

Preview with #3781B7

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

Preview Lab → · Contrast checker → · Palette generator →