#3778DD#3778DD

#3778DD is a mid, vivid blue. Relative luminance 0.195; OKLCH L 58.4% C 0.168 H 259.1°. Best body text is #000000 at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#3778DD
RGB	rgb(55, 120, 221)
HSL	hsl(217, 71%, 54%)
HSV	hsv(217, 75%, 87%)
CMYK	cmyk(75.1%, 45.7%, 0%, 13.3%)
CIE-LAB	lab(51.22, 14.12, -57.55)
CIE-LCH	lch(51.22, 59.26, 283.79°)
OKLab	oklab(58.39% -0.0318 -0.1651)
OKLCH	oklch(58.39% 0.168 259.1)
XYZ	xyz(21.3384, 19.4632, 71.0248)
Luminance	0.1947 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3778DD #DD9C37

analogous

#37CBDD #3778DD #4937DD

triadic

#3778DD #DD3778 #78DD37

tetradic

#3778DD #DD37CB #DD9C37 #37DD49

square

#3778DD #DD37CB #DD9C37 #37DD49

split-complementary

#3778DD #DD4937 #CBDD37

monochromatic

#164183 #1F5BB8 #3778DD #6B9BE6 #A0BFEF

Accessibility & contrast

On white

4.29

#3778DD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.89

#3778DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3778DD

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3778DD	#FFFFFF	#000000	##000000
##3778DD	1.00	4.29	4.89	4.89
#FFFFFF	4.29	1.00	21.00	21.00
#000000	4.89	21.00	1.00	1.00
##000000	4.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4382E1

Deuteranopia (green-blind)

#1B73DB

Tritanopia (blue-blind)

#0090A0

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #3778dd;
/* rgb */ color: rgb(55, 120, 221);
/* oklch */ color: oklch(58.4% 0.168 259.1);

Tailwind

colors: {
  custom: {
    50: '#849ee8',
    500: '#3778dd',
    950: '#000000',
  },
}

SCSS

$custom: #3778dd;
$custom-light: #849ee8;
$custom-dark: #000000;

JSON

{
  "hex": "#3778dd",
  "rgb": {
    "r": 55,
    "g": 120,
    "b": 221
  },
  "hsl": {
    "h": 216.506,
    "s": 70.94,
    "l": 54.118
  },
  "oklch": {
    "l": 0.58387,
    "c": 0.1681,
    "h": 259.1
  },
  "luminance": 0.19466
}

Semantic roles & 50–950 ramp

primary

#3778DD

secondary

#DBC095

accent

#A73AEE

background

#F8F9FE

surface

#F0F2FD

border

#CBCCD5

text

#0C0E16

muted

#7D7E84

Preview Lab

Preview with #3778DD

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

Preview Lab → · Contrast checker → · Palette generator →