#3666AC#3666AC

#3666AC is a mid, vivid blue. Relative luminance 0.133; OKLCH L 51.2% C 0.123 H 257.9°. Best body text is #FFFFFF at 5.75:1 contrast (WCAG AA passes).

Color values

HEX	#3666AC
RGB	rgb(54, 102, 172)
HSL	hsl(216, 52%, 44%)
HSV	hsv(216, 69%, 67%)
CMYK	cmyk(68.6%, 40.7%, 0%, 32.5%)
CIE-LAB	lab(43.16, 7.27, -42.26)
CIE-LCH	lch(43.16, 42.88, 279.76°)
OKLab	oklab(51.2% -0.0258 -0.1205)
OKLCH	oklch(51.2% 0.123 257.9)
XYZ	xyz(13.7164, 13.2642, 40.8591)
Luminance	0.1327 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666AC #AC7C36

analogous

#36A1AC #3666AC #4136AC

triadic

#3666AC #AC3666 #66AC36

tetradic

#3666AC #AC36A1 #AC7C36 #36AC41

square

#3666AC #AC36A1 #AC7C36 #36AC41

split-complementary

#3666AC #AC4136 #A1AC36

monochromatic

#192F4F #274A7D #3666AC #5585CA #84A6D8

Accessibility & contrast

On white

5.75

#3666AC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.65

#3666AC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666AC

5.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666AC	#FFFFFF	#000000	##FFFFFF
##3666AC	1.00	5.75	3.65	5.75
#FFFFFF	5.75	1.00	21.00	1.00
#000000	3.65	21.00	1.00	21.00
##FFFFFF	5.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#466CAF

Deuteranopia (green-blind)

#3461AB

Tritanopia (blue-blind)

#007680

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3666ac;
/* rgb */ color: rgb(54, 102, 172);
/* oklch */ color: oklch(51.2% 0.123 257.9);

Tailwind

colors: {
  custom: {
    50: '#7a91c5',
    500: '#3666ac',
    950: '#000000',
  },
}

SCSS

$custom: #3666ac;
$custom-light: #7a91c5;
$custom-dark: #000000;

JSON

{
  "hex": "#3666ac",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 172
  },
  "hsl": {
    "h": 215.593,
    "s": 52.212,
    "l": 44.314
  },
  "oklch": {
    "l": 0.51199,
    "c": 0.12319,
    "h": 257.9
  },
  "luminance": 0.13266
}

Semantic roles & 50–950 ramp

primary

#3666AC

secondary

#C2A57C

accent

#A14CDC

background

#F7F8FC

surface

#EEF0F8

border

#C9CBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3666AC

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

Preview Lab → · Contrast checker → · Palette generator →