#666ACC#666ACC

#666ACC is a mid, vivid blue. Relative luminance 0.175; OKLCH L 56.9% C 0.148 H 278.8°. Best body text is #FFFFFF at 4.67:1 contrast (WCAG AA passes).

Color values

HEX	#666ACC
RGB	rgb(102, 106, 204)
HSL	hsl(238, 50%, 60%)
HSV	hsv(238, 50%, 80%)
CMYK	cmyk(50%, 48%, 0%, 20%)
CIE-LAB	lab(48.87, 25.16, -51.53)
CIE-LCH	lch(48.87, 57.35, 296.03°)
OKLab	oklab(56.9% 0.0227 -0.1466)
OKLCH	oklch(56.9% 0.148 278.8)
XYZ	xyz(21.5292, 17.4913, 59.3567)
Luminance	0.1749 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666ACC #CCC866

analogous

#669DCC #666ACC #9566CC

triadic

#666ACC #CC666A #6ACC66

tetradic

#666ACC #CC669D #CCC866 #66CC95

square

#666ACC #CC669D #CCC866 #66CC95

split-complementary

#666ACC #CC9566 #9DCC66

monochromatic

#2E328A #3D42B8 #666ACC #9497DB #C2C3EB

Accessibility & contrast

On white

4.67

#666ACC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.50

#666ACC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666ACC

4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666ACC	#FFFFFF	#000000	##FFFFFF
##666ACC	1.00	4.67	4.50	4.67
#FFFFFF	4.67	1.00	21.00	1.00
#000000	4.50	21.00	1.00	21.00
##FFFFFF	4.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E78D0

Deuteranopia (green-blind)

#3570CA

Tritanopia (blue-blind)

#3E7F91

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666acc;
/* rgb */ color: rgb(102, 106, 204);
/* oklch */ color: oklch(56.9% 0.148 278.8);

Tailwind

colors: {
  custom: {
    50: '#9894dc',
    500: '#666acc',
    950: '#000000',
  },
}

SCSS

$custom: #666acc;
$custom-light: #9894dc;
$custom-dark: #000000;

JSON

{
  "hex": "#666acc",
  "rgb": {
    "r": 102,
    "g": 106,
    "b": 204
  },
  "hsl": {
    "h": 237.647,
    "s": 50,
    "l": 60
  },
  "oklch": {
    "l": 0.56905,
    "c": 0.14838,
    "h": 278.8
  },
  "luminance": 0.17492
}

Semantic roles & 50–950 ramp

primary

#666ACC

secondary

#DBD9B3

accent

#D44EDA

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666ACC

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

Preview Lab → · Contrast checker → · Palette generator →