#666DC6#666DC6

#666DC6 is a mid, vivid blue. Relative luminance 0.178; OKLCH L 57.1% C 0.136 H 277.8°. Best body text is #FFFFFF at 4.60:1 contrast (WCAG AA passes).

Color values

HEX	#666DC6
RGB	rgb(102, 109, 198)
HSL	hsl(236, 46%, 59%)
HSV	hsv(236, 48%, 78%)
CMYK	cmyk(48.5%, 44.9%, 0%, 22.4%)
CIE-LAB	lab(49.30, 21.47, -47.41)
CIE-LCH	lch(49.30, 52.05, 294.36°)
OKLab	oklab(57.12% 0.0184 -0.1345)
OKLCH	oklch(57.12% 0.136 277.8)
XYZ	xyz(21.1380, 17.8381, 55.7444)
Luminance	0.1784 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DC6 #C6BF66

analogous

#669DC6 #666DC6 #8F66C6

triadic

#666DC6 #C6666D #6DC666

tetradic

#666DC6 #C6669D #C6BF66 #66C68F

square

#666DC6 #C6669D #C6BF66 #66C68F

split-complementary

#666DC6 #C68F66 #9DC666

monochromatic

#303681 #4149AE #666DC6 #9398D7 #BFC2E7

Accessibility & contrast

On white

4.60

#666DC6 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#666DC6 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666DC6

4.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DC6	#FFFFFF	#000000	##FFFFFF
##666DC6	1.00	4.60	4.57	4.60
#FFFFFF	4.60	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4879C9

Deuteranopia (green-blind)

#4072C4

Tritanopia (blue-blind)

#428090

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666dc6;
/* rgb */ color: rgb(102, 109, 198);
/* oklch */ color: oklch(57.1% 0.136 277.8);

Tailwind

colors: {
  custom: {
    50: '#9796d8',
    500: '#666dc6',
    950: '#000000',
  },
}

SCSS

$custom: #666dc6;
$custom-light: #9796d8;
$custom-dark: #000000;

JSON

{
  "hex": "#666dc6",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 198
  },
  "hsl": {
    "h": 235.625,
    "s": 45.714,
    "l": 58.824
  },
  "oklch": {
    "l": 0.57115,
    "c": 0.13577,
    "h": 277.8
  },
  "luminance": 0.17839
}

Semantic roles & 50–950 ramp

primary

#666DC6

secondary

#D7D4B1

accent

#CC52D5

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666DC6

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

Preview Lab → · Contrast checker → · Palette generator →