#666BDD#666BDD

#666BDD is a mid, vivid blue. Relative luminance 0.186; OKLCH L 58.2% C 0.171 H 277.8°. Best body text is #000000 at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#666BDD
RGB	rgb(102, 107, 221)
HSL	hsl(237, 64%, 63%)
HSV	hsv(237, 54%, 87%)
CMYK	cmyk(53.8%, 51.6%, 0%, 13.3%)
CIE-LAB	lab(50.17, 29.88, -59.12)
CIE-LCH	lch(50.17, 66.24, 296.81°)
OKLab	oklab(58.22% 0.0232 -0.1689)
OKLCH	oklch(58.22% 0.171 277.8)
XYZ	xyz(23.7842, 18.5591, 70.7216)
Luminance	0.1856 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BDD #DDD866

analogous

#66A6DD #666BDD #9C66DD

triadic

#666BDD #DD666B #6BDD66

tetradic

#666BDD #DD66A6 #DDD866 #66DD9C

square

#666BDD #DD66A6 #DDD866 #66DD9C

split-complementary

#666BDD #DD9C66 #A6DD66

monochromatic

#242AA4 #343BD2 #666BDD #989BE8 #CACCF3

Accessibility & contrast

On white

4.46

#666BDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.71

#666BDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666BDD

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BDD	#FFFFFF	#000000	##000000
##666BDD	1.00	4.46	4.71	4.71
#FFFFFF	4.46	1.00	21.00	21.00
#000000	4.71	21.00	1.00	1.00
##000000	4.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E7CE1

Deuteranopia (green-blind)

#1A73DB

Tritanopia (blue-blind)

#2D859A

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666bdd;
/* rgb */ color: rgb(102, 107, 221);
/* oklch */ color: oklch(58.2% 0.171 277.8);

Tailwind

colors: {
  custom: {
    50: '#9a95e8',
    500: '#666bdd',
    950: '#000000',
  },
}

SCSS

$custom: #666bdd;
$custom-light: #9a95e8;
$custom-dark: #000000;

JSON

{
  "hex": "#666bdd",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 221
  },
  "hsl": {
    "h": 237.479,
    "s": 63.636,
    "l": 63.333
  },
  "oklch": {
    "l": 0.58215,
    "c": 0.17052,
    "h": 277.8
  },
  "luminance": 0.18561
}

Semantic roles & 50–950 ramp

primary

#666BDD

secondary

#E5E3BA

accent

#C41ACB

background

#FAF9FE

surface

#F3F1FD

border

#CDCBD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666BDD

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

Preview Lab → · Contrast checker → · Palette generator →