#3781D0#3781D0

#3781D0 is a mid, vivid cyan. Relative luminance 0.211; OKLCH L 59.5% C 0.141 H 252.6°. Best body text is #000000 at 5.21:1 contrast (WCAG AA passes).

Color values

HEX	#3781D0
RGB	rgb(55, 129, 208)
HSL	hsl(211, 62%, 52%)
HSV	hsv(211, 74%, 82%)
CMYK	cmyk(73.6%, 38%, 0%, 18.4%)
CIE-LAB	lab(53.02, 3.84, -47.33)
CIE-LCH	lch(53.02, 47.49, 274.64°)
OKLab	oklab(59.54% -0.0423 -0.1349)
OKLCH	oklch(59.54% 0.141 252.6)
XYZ	xyz(20.8067, 21.0645, 62.6315)
Luminance	0.2107 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3781D0 #D08637

analogous

#37CED0 #3781D0 #3A37D0

triadic

#3781D0 #D03781 #81D037

tetradic

#3781D0 #D037CE #D08637 #37D03A

square

#3781D0 #D037CE #D08637 #37D03A

split-complementary

#3781D0 #D03A37 #CED037

monochromatic

#1B4572 #2663A3 #3781D0 #69A0DC #9ABFE7

Accessibility & contrast

On white

4.03

#3781D0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.21

#3781D0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3781D0

5.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3781D0	#FFFFFF	#000000	##000000
##3781D0	1.00	4.03	5.21	5.21
#FFFFFF	4.03	1.00	21.00	21.00
#000000	5.21	21.00	1.00	1.00
##000000	5.21	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C86D3

Deuteranopia (green-blind)

#4578CE

Tritanopia (blue-blind)

#00949E

Achromatopsia (no color)

#7F7F7F

Design tokens & code

CSS

--color: #3781d0;
/* rgb */ color: rgb(55, 129, 208);
/* oklch */ color: oklch(59.5% 0.141 252.6);

Tailwind

colors: {
  custom: {
    50: '#81a5df',
    500: '#3781d0',
    950: '#000000',
  },
}

SCSS

$custom: #3781d0;
$custom-light: #81a5df;
$custom-dark: #000000;

JSON

{
  "hex": "#3781d0",
  "rgb": {
    "r": 55,
    "g": 129,
    "b": 208
  },
  "hsl": {
    "h": 210.98,
    "s": 61.943,
    "l": 51.569
  },
  "oklch": {
    "l": 0.59539,
    "c": 0.14137,
    "h": 252.6
  },
  "luminance": 0.21067
}

Semantic roles & 50–950 ramp

primary

#3781D0

secondary

#D3B390

accent

#9743E5

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3781D0

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

Preview Lab → · Contrast checker → · Palette generator →