#666DDD#666DDD

#666DDD is a mid, vivid blue. Relative luminance 0.190; OKLCH L 58.6% C 0.168 H 277.2°. Best body text is #000000 at 4.80:1 contrast (WCAG AA passes).

Color values

HEX	#666DDD
RGB	rgb(102, 109, 221)
HSL	hsl(236, 64%, 63%)
HSV	hsv(236, 54%, 87%)
CMYK	cmyk(53.8%, 50.7%, 0%, 13.3%)
CIE-LAB	lab(50.66, 28.66, -58.32)
CIE-LCH	lch(50.66, 64.98, 296.17°)
OKLab	oklab(58.59% 0.021 -0.1666)
OKLCH	oklch(58.59% 0.168 277.2)
XYZ	xyz(23.9951, 18.9809, 70.7919)
Luminance	0.1898 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DDD #DDD666

analogous

#66A8DD #666DDD #9A66DD

triadic

#666DDD #DD666D #6DDD66

tetradic

#666DDD #DD66A8 #DDD666 #66DD9A

square

#666DDD #DD66A8 #DDD666 #66DD9A

split-complementary

#666DDD #DD9A66 #A8DD66

monochromatic

#242CA4 #343DD2 #666DDD #989DE8 #CACDF3

Accessibility & contrast

On white

4.38

#666DDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.80

#666DDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DDD

4.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DDD	#FFFFFF	#000000	##000000
##666DDD	1.00	4.38	4.80	4.80
#FFFFFF	4.38	1.00	21.00	21.00
#000000	4.80	21.00	1.00	1.00
##000000	4.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#337EE1

Deuteranopia (green-blind)

#2174DB

Tritanopia (blue-blind)

#2D869B

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #666ddd;
/* rgb */ color: rgb(102, 109, 221);
/* oklch */ color: oklch(58.6% 0.168 277.2);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#666ddd",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 221
  },
  "hsl": {
    "h": 236.471,
    "s": 63.636,
    "l": 63.333
  },
  "oklch": {
    "l": 0.58588,
    "c": 0.16789,
    "h": 277.2
  },
  "luminance": 0.18983
}

Semantic roles & 50–950 ramp

primary

#666DDD

secondary

#E5E2BA

accent

#C11ACB

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666DDD

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

Preview Lab → · Contrast checker → · Palette generator →