#666BBD#666BBD

#666BBD is a mid, vivid blue. Relative luminance 0.170; OKLCH L 56.2% C 0.126 H 278.9°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#666BBD
RGB	rgb(102, 107, 189)
HSL	hsl(237, 40%, 57%)
HSV	hsv(237, 46%, 74%)
CMYK	cmyk(46%, 43.4%, 0%, 25.9%)
CIE-LAB	lab(48.28, 19.94, -43.86)
CIE-LCH	lch(48.28, 48.18, 294.45°)
OKLab	oklab(56.18% 0.0194 -0.1241)
OKLCH	oklch(56.18% 0.126 278.9)
XYZ	xyz(19.9197, 17.0133, 50.3685)
Luminance	0.1701 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BBD #BDB866

analogous

#6697BD #666BBD #8D66BD

triadic

#666BBD #BD666B #6BBD66

tetradic

#666BBD #BD6697 #BDB866 #66BD8D

square

#666BBD #BD6697 #BDB866 #66BD8D

split-complementary

#666BBD #BD8D66 #97BD66

monochromatic

#333776 #454BA1 #666BBD #9194CF #BCBEE2

Accessibility & contrast

On white

4.77

#666BBD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#666BBD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BBD

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BBD	#FFFFFF	#000000	##FFFFFF
##666BBD	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B76C0

Deuteranopia (green-blind)

#456FBB

Tritanopia (blue-blind)

#487C8B

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666bbd;
/* rgb */ color: rgb(102, 107, 189);
/* oklch */ color: oklch(56.2% 0.126 278.9);

Tailwind

colors: {
  custom: {
    50: '#9695d1',
    500: '#666bbd',
    950: '#000000',
  },
}

SCSS

$custom: #666bbd;
$custom-light: #9695d1;
$custom-dark: #000000;

JSON

{
  "hex": "#666bbd",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 189
  },
  "hsl": {
    "h": 236.552,
    "s": 39.726,
    "l": 57.059
  },
  "oklch": {
    "l": 0.56175,
    "c": 0.12563,
    "h": 278.9
  },
  "luminance": 0.17014
}

Semantic roles & 50–950 ramp

primary

#666BBD

secondary

#D1CFAE

accent

#C958D0

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666BBD

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

Preview Lab → · Contrast checker → · Palette generator →