#3766BB#3766BB

#3766BB is a mid, vivid blue. Relative luminance 0.139; OKLCH L 52.2% C 0.144 H 261.2°. Best body text is #FFFFFF at 5.55:1 contrast (WCAG AA passes).

Color values

HEX	#3766BB
RGB	rgb(55, 102, 187)
HSL	hsl(219, 55%, 47%)
HSV	hsv(219, 71%, 73%)
CMYK	cmyk(70.6%, 45.5%, 0%, 26.7%)
CIE-LAB	lab(44.09, 12.94, -49.54)
CIE-LCH	lch(44.09, 51.20, 284.64°)
OKLab	oklab(52.22% -0.022 -0.1418)
OKLCH	oklch(52.22% 0.144 261.2)
XYZ	xyz(15.2934, 13.9012, 48.8813)
Luminance	0.1390 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3766BB #BB8C37

analogous

#37A8BB #3766BB #4A37BB

triadic

#3766BB #BB3766 #66BB37

tetradic

#3766BB #BB37A8 #BB8C37 #37BB4A

square

#3766BB #BB37A8 #BB8C37 #37BB4A

split-complementary

#3766BB #BB4A37 #A8BB37

monochromatic

#1B325C #294C8C #3766BB #5F87D0 #8EABDE

Accessibility & contrast

On white

5.55

#3766BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.78

#3766BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3766BB

5.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3766BB	#FFFFFF	#000000	##FFFFFF
##3766BB	1.00	5.55	3.78	5.55
#FFFFFF	5.55	1.00	21.00	1.00
#000000	3.78	21.00	1.00	21.00
##FFFFFF	5.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B6FBE

Deuteranopia (green-blind)

#2163B9

Tritanopia (blue-blind)

#007A87

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3766bb;
/* rgb */ color: rgb(55, 102, 187);
/* oklch */ color: oklch(52.2% 0.144 261.2);

Tailwind

colors: {
  custom: {
    50: '#7e91d0',
    500: '#3766bb',
    950: '#000000',
  },
}

SCSS

$custom: #3766bb;
$custom-light: #7e91d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3766bb",
  "rgb": {
    "r": 55,
    "g": 102,
    "b": 187
  },
  "hsl": {
    "h": 218.636,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.52219,
    "c": 0.14351,
    "h": 261.2
  },
  "luminance": 0.13903
}

Semantic roles & 50–950 ramp

primary

#3766BB

secondary

#C9B185

accent

#A94ADE

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3766BB

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

Preview Lab → · Contrast checker → · Palette generator →