#3781D1#3781D1

#3781D1 is a mid, vivid cyan. Relative luminance 0.211; OKLCH L 59.6% C 0.143 H 252.9°. Best body text is #000000 at 5.22:1 contrast (WCAG AA passes).

Color values

HEX	#3781D1
RGB	rgb(55, 129, 209)
HSL	hsl(211, 63%, 52%)
HSV	hsv(211, 74%, 82%)
CMYK	cmyk(73.7%, 38.3%, 0%, 18%)
CIE-LAB	lab(53.07, 4.20, -47.81)
CIE-LCH	lch(53.07, 48.00, 275.02°)
OKLab	oklab(59.6% -0.042 -0.1363)
OKLCH	oklch(59.6% 0.143 252.9)
XYZ	xyz(20.9301, 21.1138, 63.2815)
Luminance	0.2112 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3781D1 #D18737

analogous

#37CED1 #3781D1 #3A37D1

triadic

#3781D1 #D13781 #81D137

tetradic

#3781D1 #D137CE #D18737 #37D13A

square

#3781D1 #D137CE #D18737 #37D13A

split-complementary

#3781D1 #D13A37 #CED137

monochromatic

#1A4573 #2663A5 #3781D1 #69A0DC #9BC0E8

Accessibility & contrast

On white

4.02

#3781D1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.22

#3781D1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3781D1

5.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3781D1	#FFFFFF	#000000	##000000
##3781D1	1.00	4.02	5.22	5.22
#FFFFFF	4.02	1.00	21.00	21.00
#000000	5.22	21.00	1.00	1.00
##000000	5.22	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C86D4

Deuteranopia (green-blind)

#4478CF

Tritanopia (blue-blind)

#00949F

Achromatopsia (no color)

#7F7F7F

Design tokens & code

CSS

--color: #3781d1;
/* rgb */ color: rgb(55, 129, 209);
/* oklch */ color: oklch(59.6% 0.143 252.9);

Tailwind

colors: {
  custom: {
    50: '#81a5df',
    500: '#3781d1',
    950: '#000000',
  },
}

SCSS

$custom: #3781d1;
$custom-light: #81a5df;
$custom-dark: #000000;

JSON

{
  "hex": "#3781d1",
  "rgb": {
    "r": 55,
    "g": 129,
    "b": 209
  },
  "hsl": {
    "h": 211.169,
    "s": 62.602,
    "l": 51.765
  },
  "oklch": {
    "l": 0.59598,
    "c": 0.14265,
    "h": 252.9
  },
  "luminance": 0.21116
}

Semantic roles & 50–950 ramp

primary

#3781D1

secondary

#D4B390

accent

#9742E6

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3781D1

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

Preview Lab → · Contrast checker → · Palette generator →