#666FC7#666FC7

#666FC7 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.6% C 0.134 H 276.9°. Best body text is #000000 at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#666FC7
RGB	rgb(102, 111, 199)
HSL	hsl(234, 46%, 59%)
HSV	hsv(234, 49%, 78%)
CMYK	cmyk(48.7%, 44.2%, 0%, 22%)
CIE-LAB	lab(49.88, 20.55, -47.06)
CIE-LCH	lch(49.88, 51.36, 293.59°)
OKLab	oklab(57.57% 0.0162 -0.1335)
OKLCH	oklch(57.57% 0.134 276.9)
XYZ	xyz(21.4695, 18.3160, 56.4258)
Luminance	0.1832 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FC7 #C7BE66

analogous

#66A0C7 #666FC7 #8E66C7

triadic

#666FC7 #C7666F #6FC766

tetradic

#666FC7 #C766A0 #C7BE66 #66C78E

square

#666FC7 #C766A0 #C7BE66 #66C78E

split-complementary

#666FC7 #C78E66 #A0C766

monochromatic

#303883 #404BB0 #666FC7 #9399D7 #C0C3E8

Accessibility & contrast

On white

4.50

#666FC7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.66

#666FC7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FC7

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FC7	#FFFFFF	#000000	##000000
##666FC7	1.00	4.50	4.66	4.66
#FFFFFF	4.50	1.00	21.00	21.00
#000000	4.66	21.00	1.00	1.00
##000000	4.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B7BCA

Deuteranopia (green-blind)

#4373C5

Tritanopia (blue-blind)

#418291

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666fc7;
/* rgb */ color: rgb(102, 111, 199);
/* oklch */ color: oklch(57.6% 0.134 276.9);

Tailwind

colors: {
  custom: {
    50: '#9798d8',
    500: '#666fc7',
    950: '#000000',
  },
}

SCSS

$custom: #666fc7;
$custom-light: #9798d8;
$custom-dark: #000000;

JSON

{
  "hex": "#666fc7",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 199
  },
  "hsl": {
    "h": 234.433,
    "s": 46.411,
    "l": 59.02
  },
  "oklch": {
    "l": 0.57573,
    "c": 0.13446,
    "h": 276.9
  },
  "luminance": 0.18317
}

Semantic roles & 50–950 ramp

primary

#666FC7

secondary

#D7D4B1

accent

#CA52D6

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666FC7

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

Preview Lab → · Contrast checker → · Palette generator →