#666BD0#666BD0

#666BD0 is a mid, vivid blue. Relative luminance 0.179; OKLCH L 57.4% C 0.153 H 278.3°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#666BD0
RGB	rgb(102, 107, 208)
HSL	hsl(237, 53%, 61%)
HSV	hsv(237, 51%, 82%)
CMYK	cmyk(51%, 48.6%, 0%, 18.4%)
CIE-LAB	lab(49.37, 25.80, -53.03)
CIE-LCH	lch(49.37, 58.97, 295.94°)
OKLab	oklab(57.35% 0.022 -0.151)
OKLCH	oklch(57.35% 0.153 278.3)
XYZ	xyz(22.1188, 17.8929, 61.9504)
Luminance	0.1789 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BD0 #D0CB66

analogous

#66A0D0 #666BD0 #9666D0

triadic

#666BD0 #D0666B #6BD066

tetradic

#666BD0 #D066A0 #D0CB66 #66D096

square

#666BD0 #D066A0 #D0CB66 #66D096

split-complementary

#666BD0 #D09666 #A0D066

monochromatic

#2C3190 #3A41BE #666BD0 #9598DE #C4C6ED

Accessibility & contrast

On white

4.59

#666BD0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.58

#666BD0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666BD0

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BD0	#FFFFFF	#000000	##FFFFFF
##666BD0	1.00	4.59	4.58	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.58	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C7AD4

Deuteranopia (green-blind)

#3271CE

Tritanopia (blue-blind)

#3A8194

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666bd0;
/* rgb */ color: rgb(102, 107, 208);
/* oklch */ color: oklch(57.4% 0.153 278.3);

Tailwind

colors: {
  custom: {
    50: '#9895df',
    500: '#666bd0',
    950: '#000000',
  },
}

SCSS

$custom: #666bd0;
$custom-light: #9895df;
$custom-dark: #000000;

JSON

{
  "hex": "#666bd0",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 208
  },
  "hsl": {
    "h": 237.17,
    "s": 53,
    "l": 60.784
  },
  "oklch": {
    "l": 0.57354,
    "c": 0.15262,
    "h": 278.3
  },
  "luminance": 0.17894
}

Semantic roles & 50–950 ramp

primary

#666BD0

secondary

#DDDBB5

accent

#B925C0

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666BD0

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

Preview Lab → · Contrast checker → · Palette generator →