#666FDA#666FDA

#666FDA is a mid, vivid blue. Relative luminance 0.193; OKLCH L 58.8% C 0.161 H 276.6°. Best body text is #000000 at 4.85:1 contrast (WCAG AA passes).

Color values

HEX	#666FDA
RGB	rgb(102, 111, 218)
HSL	hsl(235, 61%, 63%)
HSV	hsv(235, 53%, 85%)
CMYK	cmyk(53.2%, 49.1%, 0%, 14.5%)
CIE-LAB	lab(50.98, 26.49, -56.12)
CIE-LCH	lch(50.98, 62.06, 295.27°)
OKLab	oklab(58.77% 0.0186 -0.1601)
OKLCH	oklch(58.77% 0.161 276.6)
XYZ	xyz(23.8148, 19.2541, 68.7776)
Luminance	0.1926 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FDA #DAD166

analogous

#66A9DA #666FDA #9766DA

triadic

#666FDA #DA666F #6FDA66

tetradic

#666FDA #DA66A9 #DAD166 #66DA97

square

#666FDA #DA66A9 #DAD166 #66DA97

split-complementary

#666FDA #DA9766 #A9DA66

monochromatic

#26309F #3541CE #666FDA #979DE6 #C9CCF2

Accessibility & contrast

On white

4.33

#666FDA on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.85

#666FDA on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FDA

4.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FDA	#FFFFFF	#000000	##000000
##666FDA	1.00	4.33	4.85	4.85
#FFFFFF	4.33	1.00	21.00	21.00
#000000	4.85	21.00	1.00	1.00
##000000	4.85	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B7EDE

Deuteranopia (green-blind)

#2D75D8

Tritanopia (blue-blind)

#30879A

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #666fda;
/* rgb */ color: rgb(102, 111, 218);
/* oklch */ color: oklch(58.8% 0.161 276.6);

Tailwind

colors: {
  custom: {
    50: '#9a98e6',
    500: '#666fda',
    950: '#000000',
  },
}

SCSS

$custom: #666fda;
$custom-light: #9a98e6;
$custom-dark: #000000;

JSON

{
  "hex": "#666fda",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 218
  },
  "hsl": {
    "h": 235.345,
    "s": 61.053,
    "l": 62.745
  },
  "oklch": {
    "l": 0.58769,
    "c": 0.16113,
    "h": 276.6
  },
  "luminance": 0.19256
}

Semantic roles & 50–950 ramp

primary

#666FDA

secondary

#E3E0B9

accent

#BB1DC9

background

#F9F9FE

surface

#F2F2FC

border

#CCCCD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666FDA

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

Preview Lab → · Contrast checker → · Palette generator →