#666CDD#666CDD

#666CDD is a mid, vivid blue. Relative luminance 0.188; OKLCH L 58.4% C 0.169 H 277.5°. Best body text is #000000 at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#666CDD
RGB	rgb(102, 108, 221)
HSL	hsl(237, 64%, 63%)
HSV	hsv(237, 54%, 87%)
CMYK	cmyk(53.8%, 51.1%, 0%, 13.3%)
CIE-LAB	lab(50.42, 29.27, -58.72)
CIE-LCH	lch(50.42, 65.61, 296.49°)
OKLab	oklab(58.4% 0.0221 -0.1678)
OKLCH	oklch(58.4% 0.169 277.5)
XYZ	xyz(23.8891, 18.7688, 70.7565)
Luminance	0.1877 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CDD #DDD766

analogous

#66A7DD #666CDD #9B66DD

triadic

#666CDD #DD666C #6CDD66

tetradic

#666CDD #DD66A7 #DDD766 #66DD9B

square

#666CDD #DD66A7 #DDD766 #66DD9B

split-complementary

#666CDD #DD9B66 #A7DD66

monochromatic

#242BA4 #343CD2 #666CDD #989CE8 #CACCF3

Accessibility & contrast

On white

4.42

#666CDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.75

#666CDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CDD

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CDD	#FFFFFF	#000000	##000000
##666CDD	1.00	4.42	4.75	4.75
#FFFFFF	4.42	1.00	21.00	21.00
#000000	4.75	21.00	1.00	1.00
##000000	4.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#307DE1

Deuteranopia (green-blind)

#1E73DB

Tritanopia (blue-blind)

#2D859A

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666cdd;
/* rgb */ color: rgb(102, 108, 221);
/* oklch */ color: oklch(58.4% 0.169 277.5);

Tailwind

colors: {
  custom: {
    50: '#9a96e8',
    500: '#666cdd',
    950: '#000000',
  },
}

SCSS

$custom: #666cdd;
$custom-light: #9a96e8;
$custom-dark: #000000;

JSON

{
  "hex": "#666cdd",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 221
  },
  "hsl": {
    "h": 236.975,
    "s": 63.636,
    "l": 63.333
  },
  "oklch": {
    "l": 0.58401,
    "c": 0.16921,
    "h": 277.5
  },
  "luminance": 0.1877
}

Semantic roles & 50–950 ramp

primary

#666CDD

secondary

#E5E2BA

accent

#C21ACB

background

#FAF9FE

surface

#F3F1FD

border

#CDCBD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666CDD

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

Preview Lab → · Contrast checker → · Palette generator →