#3780CC#3780CC

#3780CC is a mid, vivid cyan. Relative luminance 0.206; OKLCH L 59.1% C 0.137 H 252.0°. Best body text is #000000 at 5.12:1 contrast (WCAG AA passes).

Color values

HEX	#3780CC
RGB	rgb(55, 128, 204)
HSL	hsl(211, 59%, 51%)
HSV	hsv(211, 73%, 80%)
CMYK	cmyk(73%, 37.3%, 0%, 20%)
CIE-LAB	lab(52.52, 3.00, -45.86)
CIE-LCH	lch(52.52, 45.96, 273.74°)
OKLab	oklab(59.08% -0.0423 -0.1306)
OKLCH	oklch(59.08% 0.137 252)
XYZ	xyz(20.1897, 20.6079, 60.0287)
Luminance	0.2061 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3780CC #CC8337

analogous

#37CBCC #3780CC #3837CC

triadic

#3780CC #CC3780 #80CC37

tetradic

#3780CC #CC37CB #CC8337 #37CC38

square

#3780CC #CC37CB #CC8337 #37CC38

split-complementary

#3780CC #CC3837 #CBCC37

monochromatic

#1C436D #28629E #3780CC #689FD8 #99BEE5

Accessibility & contrast

On white

4.10

#3780CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.12

#3780CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3780CC

5.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3780CC	#FFFFFF	#000000	##000000
##3780CC	1.00	4.10	5.12	5.12
#FFFFFF	4.10	1.00	21.00	21.00
#000000	5.12	21.00	1.00	1.00
##000000	5.12	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D85CF

Deuteranopia (green-blind)

#4777CA

Tritanopia (blue-blind)

#00929C

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #3780cc;
/* rgb */ color: rgb(55, 128, 204);
/* oklch */ color: oklch(59.1% 0.137 252.0);

Tailwind

colors: {
  custom: {
    50: '#81a4dc',
    500: '#3780cc',
    950: '#000000',
  },
}

SCSS

$custom: #3780cc;
$custom-light: #81a4dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3780cc",
  "rgb": {
    "r": 55,
    "g": 128,
    "b": 204
  },
  "hsl": {
    "h": 210.604,
    "s": 59.363,
    "l": 50.784
  },
  "oklch": {
    "l": 0.59076,
    "c": 0.13729,
    "h": 252
  },
  "luminance": 0.2061
}

Semantic roles & 50–950 ramp

primary

#3780CC

secondary

#D0B08E

accent

#9545E3

background

#F8FAFD

surface

#F0F3FB

border

#CBCDD4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3780CC

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

Preview Lab → · Contrast checker → · Palette generator →