#666BBB#666BBB

#666BBB is a mid, vivid blue. Relative luminance 0.169; OKLCH L 56.1% C 0.123 H 278.9°. Best body text is #FFFFFF at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#666BBB
RGB	rgb(102, 107, 187)
HSL	hsl(236, 38%, 57%)
HSV	hsv(236, 45%, 73%)
CMYK	cmyk(45.5%, 42.8%, 0%, 26.7%)
CIE-LAB	lab(48.17, 19.33, -42.87)
CIE-LCH	lch(48.17, 47.03, 294.27°)
OKLab	oklab(56.06% 0.0191 -0.1212)
OKLCH	oklch(56.06% 0.123 278.9)
XYZ	xyz(19.7041, 16.9271, 49.2331)
Luminance	0.1693 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BBB #BBB666

analogous

#6696BB #666BBB #8C66BB

triadic

#666BBB #BB666B #6BBB66

tetradic

#666BBB #BB6696 #BBB666 #66BB8C

square

#666BBB #BB6696 #BBB666 #66BB8C

split-complementary

#666BBB #BB8C66 #96BB66

monochromatic

#333773 #464B9E #666BBB #9094CE #BBBDE1

Accessibility & contrast

On white

4.79

#666BBB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#666BBB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BBB

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BBB	#FFFFFF	#000000	##FFFFFF
##666BBB	1.00	4.79	4.39	4.79
#FFFFFF	4.79	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C76BE

Deuteranopia (green-blind)

#466FB9

Tritanopia (blue-blind)

#497B8A

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666bbb;
/* rgb */ color: rgb(102, 107, 187);
/* oklch */ color: oklch(56.1% 0.123 278.9);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#666bbb",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 187
  },
  "hsl": {
    "h": 236.471,
    "s": 38.462,
    "l": 56.667
  },
  "oklch": {
    "l": 0.56057,
    "c": 0.12273,
    "h": 278.9
  },
  "luminance": 0.16928
}

Semantic roles & 50–950 ramp

primary

#666BBB

secondary

#D0CEAD

accent

#C859CE

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666BBB

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

Preview Lab → · Contrast checker → · Palette generator →