#3778BB#3778BB

#3778BB is a mid, vivid cyan. Relative luminance 0.178; OKLCH L 56.3% C 0.124 H 251.5°. Best body text is #FFFFFF at 4.60:1 contrast (WCAG AA passes).

Color values

HEX	#3778BB
RGB	rgb(55, 120, 187)
HSL	hsl(210, 55%, 47%)
HSV	hsv(210, 71%, 73%)
CMYK	cmyk(70.6%, 35.8%, 0%, 26.7%)
CIE-LAB	lab(49.29, 1.71, -41.25)
CIE-LCH	lch(49.29, 41.29, 272.37°)
OKLab	oklab(56.26% -0.0391 -0.1172)
OKLCH	oklch(56.26% 0.124 251.5)
XYZ	xyz(17.2583, 17.8312, 49.5363)
Luminance	0.1783 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3778BB #BB7A37

analogous

#37BABB #3778BB #3837BB

triadic

#3778BB #BB3778 #78BB37

tetradic

#3778BB #BB37BA #BB7A37 #37BB38

square

#3778BB #BB37BA #BB7A37 #37BB38

split-complementary

#3778BB #BB3837 #BABB37

monochromatic

#1B3B5C #295A8C #3778BB #5F97D0 #8EB6DE

Accessibility & contrast

On white

4.60

#3778BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#3778BB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3778BB

4.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3778BB	#FFFFFF	#000000	##FFFFFF
##3778BB	1.00	4.60	4.57	4.60
#FFFFFF	4.60	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5A7CBE

Deuteranopia (green-blind)

#4770BA

Tritanopia (blue-blind)

#008891

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3778bb;
/* rgb */ color: rgb(55, 120, 187);
/* oklch */ color: oklch(56.3% 0.124 251.5);

Tailwind

colors: {
  custom: {
    50: '#7d9ed0',
    500: '#3778bb',
    950: '#000000',
  },
}

SCSS

$custom: #3778bb;
$custom-light: #7d9ed0;
$custom-dark: #000000;

JSON

{
  "hex": "#3778bb",
  "rgb": {
    "r": 55,
    "g": 120,
    "b": 187
  },
  "hsl": {
    "h": 210.455,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.56258,
    "c": 0.12359,
    "h": 251.5
  },
  "luminance": 0.17833
}

Semantic roles & 50–950 ramp

primary

#3778BB

secondary

#C9A785

accent

#954ADE

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3778BB

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

Preview Lab → · Contrast checker → · Palette generator →