#666DCC#666DCC

#666DCC is a mid, vivid blue. Relative luminance 0.181; OKLCH L 57.5% C 0.144 H 277.7°. Best body text is #000000 at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#666DCC
RGB	rgb(102, 109, 204)
HSL	hsl(236, 50%, 60%)
HSV	hsv(236, 50%, 80%)
CMYK	cmyk(50%, 46.6%, 0%, 20%)
CIE-LAB	lab(49.64, 23.33, -50.30)
CIE-LCH	lch(49.64, 55.45, 294.88°)
OKLab	oklab(57.49% 0.0192 -0.143)
OKLCH	oklch(57.49% 0.144 277.7)
XYZ	xyz(21.8438, 18.1204, 59.4616)
Luminance	0.1812 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DCC #CCC566

analogous

#66A0CC #666DCC #9266CC

triadic

#666DCC #CC666D #6DCC66

tetradic

#666DCC #CC66A0 #CCC566 #66CC92

square

#666DCC #CC66A0 #CCC566 #66CC92

split-complementary

#666DCC #CC9266 #A0CC66

monochromatic

#2E348A #3D46B8 #666DCC #9499DB #C2C5EB

Accessibility & contrast

On white

4.54

#666DCC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.62

#666DCC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DCC

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DCC	#FFFFFF	#000000	##000000
##666DCC	1.00	4.54	4.62	4.62
#FFFFFF	4.54	1.00	21.00	21.00
#000000	4.62	21.00	1.00	1.00
##000000	4.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#447ACF

Deuteranopia (green-blind)

#3A72CA

Tritanopia (blue-blind)

#3D8193

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666dcc;
/* rgb */ color: rgb(102, 109, 204);
/* oklch */ color: oklch(57.5% 0.144 277.7);

Tailwind

colors: {
  custom: {
    50: '#9896dc',
    500: '#666dcc',
    950: '#000000',
  },
}

SCSS

$custom: #666dcc;
$custom-light: #9896dc;
$custom-dark: #000000;

JSON

{
  "hex": "#666dcc",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 204
  },
  "hsl": {
    "h": 235.882,
    "s": 50,
    "l": 60
  },
  "oklch": {
    "l": 0.57486,
    "c": 0.14429,
    "h": 277.7
  },
  "luminance": 0.18122
}

Semantic roles & 50–950 ramp

primary

#666DCC

secondary

#DBD8B3

accent

#D04EDA

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666DCC

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

Preview Lab → · Contrast checker → · Palette generator →