#666DD9#666DD9

#666DD9 is a mid, vivid blue. Relative luminance 0.188; OKLCH L 58.3% C 0.162 H 277.3°. Best body text is #000000 at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#666DD9
RGB	rgb(102, 109, 217)
HSL	hsl(236, 60%, 63%)
HSV	hsv(236, 53%, 85%)
CMYK	cmyk(53%, 49.8%, 0%, 14.9%)
CIE-LAB	lab(50.42, 27.40, -56.46)
CIE-LCH	lch(50.42, 62.75, 295.89°)
OKLab	oklab(58.32% 0.0207 -0.1611)
OKLCH	oklch(58.32% 0.162 277.3)
XYZ	xyz(23.4686, 18.7703, 68.0186)
Luminance	0.1877 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DD9 #D9D266

analogous

#66A6D9 #666DD9 #9966D9

triadic

#666DD9 #D9666D #6DD966

tetradic

#666DD9 #D966A6 #D9D266 #66D999

square

#666DD9 #D966A6 #D9D266 #66D999

split-complementary

#666DD9 #D99966 #A6D966

monochromatic

#272E9D #353ECD #666DD9 #979CE5 #C8CBF1

Accessibility & contrast

On white

4.42

#666DD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.75

#666DD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DD9

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DD9	#FFFFFF	#000000	##000000
##666DD9	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)

#387DDD

Deuteranopia (green-blind)

#2973D7

Tritanopia (blue-blind)

#318599

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666dd9;
/* rgb */ color: rgb(102, 109, 217);
/* oklch */ color: oklch(58.3% 0.162 277.3);

Tailwind

colors: {
  custom: {
    50: '#9a96e5',
    500: '#666dd9',
    950: '#000000',
  },
}

SCSS

$custom: #666dd9;
$custom-light: #9a96e5;
$custom-dark: #000000;

JSON

{
  "hex": "#666dd9",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 217
  },
  "hsl": {
    "h": 236.348,
    "s": 60.209,
    "l": 62.549
  },
  "oklch": {
    "l": 0.58323,
    "c": 0.1624,
    "h": 277.3
  },
  "luminance": 0.18772
}

Semantic roles & 50–950 ramp

primary

#666DD9

secondary

#E2E0B8

accent

#BE1EC8

background

#F9F9FE

surface

#F2F2FC

border

#CCCCD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666DD9

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

Preview Lab → · Contrast checker → · Palette generator →