#666BBC#666BBC

#666BBC is a mid, vivid blue. Relative luminance 0.170; OKLCH L 56.1% C 0.124 H 278.9°. Best body text is #FFFFFF at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#666BBC
RGB	rgb(102, 107, 188)
HSL	hsl(237, 39%, 57%)
HSV	hsv(237, 46%, 74%)
CMYK	cmyk(45.7%, 43.1%, 0%, 26.3%)
CIE-LAB	lab(48.22, 19.64, -43.37)
CIE-LCH	lch(48.22, 47.60, 294.36°)
OKLab	oklab(56.12% 0.0193 -0.1227)
OKLCH	oklch(56.12% 0.124 278.9)
XYZ	xyz(19.8115, 16.9700, 49.7988)
Luminance	0.1697 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BBC #BCB766

analogous

#6696BC #666BBC #8C66BC

triadic

#666BBC #BC666B #6BBC66

tetradic

#666BBC #BC6696 #BCB766 #66BC8C

square

#666BBC #BC6696 #BCB766 #66BC8C

split-complementary

#666BBC #BC8C66 #96BC66

monochromatic

#333775 #464B9F #666BBC #9194CF #BBBDE1

Accessibility & contrast

On white

4.78

#666BBC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#666BBC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BBC

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BBC	#FFFFFF	#000000	##FFFFFF
##666BBC	1.00	4.78	4.39	4.78
#FFFFFF	4.78	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C76BF

Deuteranopia (green-blind)

#466FBA

Tritanopia (blue-blind)

#487C8A

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666bbc;
/* rgb */ color: rgb(102, 107, 188);
/* oklch */ color: oklch(56.1% 0.124 278.9);

Tailwind

colors: {
  custom: {
    50: '#9695d0',
    500: '#666bbc',
    950: '#000000',
  },
}

SCSS

$custom: #666bbc;
$custom-light: #9695d0;
$custom-dark: #000000;

JSON

{
  "hex": "#666bbc",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 188
  },
  "hsl": {
    "h": 236.512,
    "s": 39.091,
    "l": 56.863
  },
  "oklch": {
    "l": 0.56116,
    "c": 0.12418,
    "h": 278.9
  },
  "luminance": 0.16971
}

Semantic roles & 50–950 ramp

primary

#666BBC

secondary

#D0CEAD

accent

#C859CF

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666BBC

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

Preview Lab → · Contrast checker → · Palette generator →