#666CBC#666CBC

#666CBC is a mid, vivid blue. Relative luminance 0.172; OKLCH L 56.3% C 0.123 H 278.4°. Best body text is #FFFFFF at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#666CBC
RGB	rgb(102, 108, 188)
HSL	hsl(236, 39%, 57%)
HSV	hsv(236, 46%, 74%)
CMYK	cmyk(45.7%, 42.6%, 0%, 26.3%)
CIE-LAB	lab(48.49, 19.02, -42.95)
CIE-LCH	lch(48.49, 46.97, 293.89°)
OKLab	oklab(56.32% 0.018 -0.1215)
OKLCH	oklch(56.32% 0.123 278.4)
XYZ	xyz(19.9164, 17.1797, 49.8338)
Luminance	0.1718 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CBC #BCB666

analogous

#6697BC #666CBC #8B66BC

triadic

#666CBC #BC666C #6CBC66

tetradic

#666CBC #BC6697 #BCB666 #66BC8B

square

#666CBC #BC6697 #BCB666 #66BC8B

split-complementary

#666CBC #BC8B66 #97BC66

monochromatic

#333875 #464C9F #666CBC #9195CF #BBBEE1

Accessibility & contrast

On white

4.73

#666CBC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.44

#666CBC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CBC

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CBC	#FFFFFF	#000000	##FFFFFF
##666CBC	1.00	4.73	4.44	4.73
#FFFFFF	4.73	1.00	21.00	1.00
#000000	4.44	21.00	1.00	21.00
##FFFFFF	4.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D77BF

Deuteranopia (green-blind)

#4770BA

Tritanopia (blue-blind)

#487D8B

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666cbc;
/* rgb */ color: rgb(102, 108, 188);
/* oklch */ color: oklch(56.3% 0.123 278.4);

Tailwind

colors: {
  custom: {
    50: '#9696d0',
    500: '#666cbc',
    950: '#000000',
  },
}

SCSS

$custom: #666cbc;
$custom-light: #9696d0;
$custom-dark: #000000;

JSON

{
  "hex": "#666cbc",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 188
  },
  "hsl": {
    "h": 235.814,
    "s": 39.091,
    "l": 56.863
  },
  "oklch": {
    "l": 0.56317,
    "c": 0.12279,
    "h": 278.4
  },
  "luminance": 0.17181
}

Semantic roles & 50–950 ramp

primary

#666CBC

secondary

#D0CEAD

accent

#C759CF

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666CBC

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

Preview Lab → · Contrast checker → · Palette generator →