#3666BE#3666BE

#3666BE is a mid, vivid blue. Relative luminance 0.140; OKLCH L 52.4% C 0.148 H 261.3°. Best body text is #FFFFFF at 5.52:1 contrast (WCAG AA passes).

Color values

HEX	#3666BE
RGB	rgb(54, 102, 190)
HSL	hsl(219, 56%, 48%)
HSV	hsv(219, 72%, 75%)
CMYK	cmyk(71.6%, 46.3%, 0%, 25.5%)
CIE-LAB	lab(44.24, 13.90, -51.05)
CIE-LCH	lch(44.24, 52.90, 285.23°)
OKLab	oklab(52.38% -0.0223 -0.1463)
OKLCH	oklch(52.38% 0.148 261.3)
XYZ	xyz(15.5636, 14.0031, 50.5878)
Luminance	0.1401 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666BE #BE8E36

analogous

#36AABE #3666BE #4A36BE

triadic

#3666BE #BE3666 #66BE36

tetradic

#3666BE #BE36AA #BE8E36 #36BE4A

square

#3666BE #BE36AA #BE8E36 #36BE4A

split-complementary

#3666BE #BE4A36 #AABE36

monochromatic

#1B335F #284C8E #3666BE #6088D2 #8FABDF

Accessibility & contrast

On white

5.52

#3666BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.80

#3666BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666BE

5.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666BE	#FFFFFF	#000000	##FFFFFF
##3666BE	1.00	5.52	3.80	5.52
#FFFFFF	5.52	1.00	21.00	1.00
#000000	3.80	21.00	1.00	21.00
##FFFFFF	5.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#386FC1

Deuteranopia (green-blind)

#1A63BC

Tritanopia (blue-blind)

#007B89

Achromatopsia (no color)

#696969

Design tokens & code

CSS

--color: #3666be;
/* rgb */ color: rgb(54, 102, 190);
/* oklch */ color: oklch(52.4% 0.148 261.3);

Tailwind

colors: {
  custom: {
    50: '#7e91d2',
    500: '#3666be',
    950: '#000000',
  },
}

SCSS

$custom: #3666be;
$custom-light: #7e91d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3666be",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 190
  },
  "hsl": {
    "h": 218.824,
    "s": 55.738,
    "l": 47.843
  },
  "oklch": {
    "l": 0.52381,
    "c": 0.14796,
    "h": 261.3
  },
  "luminance": 0.14005
}

Semantic roles & 50–950 ramp

primary

#3666BE

secondary

#CAB286

accent

#AA49DF

background

#F8F8FD

surface

#EFF0FA

border

#CACBD3

text

#0B0C14

muted

#7C7D83

Preview Lab

Preview with #3666BE

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

Preview Lab → · Contrast checker → · Palette generator →