#3780CB#3780CB

#3780CB is a mid, vivid cyan. Relative luminance 0.206; OKLCH L 59.0% C 0.136 H 251.7°. Best body text is #000000 at 5.11:1 contrast (WCAG AA passes).

Color values

HEX	#3780CB
RGB	rgb(55, 128, 203)
HSL	hsl(210, 59%, 51%)
HSV	hsv(210, 73%, 80%)
CMYK	cmyk(72.9%, 36.9%, 0%, 20.4%)
CIE-LAB	lab(52.46, 2.64, -45.38)
CIE-LCH	lch(52.46, 45.45, 273.33°)
OKLab	oklab(59.02% -0.0426 -0.1292)
OKLCH	oklch(59.02% 0.136 251.7)
XYZ	xyz(20.0702, 20.5601, 59.3991)
Luminance	0.2056 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3780CB #CB8237

analogous

#37CACB #3780CB #3837CB

triadic

#3780CB #CB3780 #80CB37

tetradic

#3780CB #CB37CA #CB8237 #37CB38

square

#3780CB #CB37CA #CB8237 #37CB38

split-complementary

#3780CB #CB3837 #CACB37

monochromatic

#1C436C #29629C #3780CB #689FD8 #98BEE4

Accessibility & contrast

On white

4.11

#3780CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.11

#3780CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3780CB

5.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3780CB	#FFFFFF	#000000	##000000
##3780CB	1.00	4.11	5.11	5.11
#FFFFFF	4.11	1.00	21.00	21.00
#000000	5.11	21.00	1.00	1.00
##000000	5.11	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D85CE

Deuteranopia (green-blind)

#4777CA

Tritanopia (blue-blind)

#00929C

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #3780cb;
/* rgb */ color: rgb(55, 128, 203);
/* oklch */ color: oklch(59.0% 0.136 251.7);

Tailwind

colors: {
  custom: {
    50: '#80a4db',
    500: '#3780cb',
    950: '#000000',
  },
}

SCSS

$custom: #3780cb;
$custom-light: #80a4db;
$custom-dark: #000000;

JSON

{
  "hex": "#3780cb",
  "rgb": {
    "r": 55,
    "g": 128,
    "b": 203
  },
  "hsl": {
    "h": 210.405,
    "s": 58.73,
    "l": 50.588
  },
  "oklch": {
    "l": 0.59017,
    "c": 0.13602,
    "h": 251.7
  },
  "luminance": 0.20562
}

Semantic roles & 50–950 ramp

primary

#3780CB

secondary

#D0AF8E

accent

#9546E2

background

#F8FAFD

surface

#F0F3FB

border

#CBCDD4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3780CB

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

Preview Lab → · Contrast checker → · Palette generator →