#3666BD#3666BD

#3666BD is a mid, vivid blue. Relative luminance 0.140; OKLCH L 52.3% C 0.147 H 261.2°. Best body text is #FFFFFF at 5.54:1 contrast (WCAG AA passes).

Color values

HEX	#3666BD
RGB	rgb(54, 102, 189)
HSL	hsl(219, 56%, 48%)
HSV	hsv(219, 71%, 74%)
CMYK	cmyk(71.4%, 46%, 0%, 25.9%)
CIE-LAB	lab(44.17, 13.53, -50.57)
CIE-LCH	lch(44.17, 52.34, 284.98°)
OKLab	oklab(52.31% -0.0225 -0.1449)
OKLCH	oklch(52.31% 0.147 261.2)
XYZ	xyz(15.4547, 13.9595, 50.0142)
Luminance	0.1396 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666BD #BD8D36

analogous

#36A9BD #3666BD #4A36BD

triadic

#3666BD #BD3666 #66BD36

tetradic

#3666BD #BD36A9 #BD8D36 #36BD4A

square

#3666BD #BD36A9 #BD8D36 #36BD4A

split-complementary

#3666BD #BD4A36 #A9BD36

monochromatic

#1B335E #284C8D #3666BD #5F88D1 #8FABDF

Accessibility & contrast

On white

5.54

#3666BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.79

#3666BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666BD

5.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666BD	#FFFFFF	#000000	##FFFFFF
##3666BD	1.00	5.54	3.79	5.54
#FFFFFF	5.54	1.00	21.00	1.00
#000000	3.79	21.00	1.00	21.00
##FFFFFF	5.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#396FC0

Deuteranopia (green-blind)

#1C63BB

Tritanopia (blue-blind)

#007A88

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3666bd;
/* rgb */ color: rgb(54, 102, 189);
/* oklch */ color: oklch(52.3% 0.147 261.2);

Tailwind

colors: {
  custom: {
    50: '#7e91d1',
    500: '#3666bd',
    950: '#000000',
  },
}

SCSS

$custom: #3666bd;
$custom-light: #7e91d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3666bd",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 189
  },
  "hsl": {
    "h": 218.667,
    "s": 55.556,
    "l": 47.647
  },
  "oklch": {
    "l": 0.52312,
    "c": 0.14659,
    "h": 261.2
  },
  "luminance": 0.13961
}

Semantic roles & 50–950 ramp

primary

#3666BD

secondary

#C9B185

accent

#AA49DF

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3666BD

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

Preview Lab → · Contrast checker → · Palette generator →