#666DDF#666DDF

#666DDF is a mid, vivid blue. Relative luminance 0.191; OKLCH L 58.7% C 0.171 H 277.1°. Best body text is #000000 at 4.82:1 contrast (WCAG AA passes).

Color values

HEX	#666DDF
RGB	rgb(102, 109, 223)
HSL	hsl(237, 65%, 64%)
HSV	hsv(237, 54%, 87%)
CMYK	cmyk(54.3%, 51.1%, 0%, 12.5%)
CIE-LAB	lab(50.79, 29.29, -59.25)
CIE-LCH	lch(50.79, 66.10, 296.31°)
OKLab	oklab(58.72% 0.0212 -0.1693)
OKLCH	oklch(58.72% 0.171 277.1)
XYZ	xyz(24.2632, 19.0882, 72.2036)
Luminance	0.1909 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DDF #DFD866

analogous

#66A9DF #666DDF #9B66DF

triadic

#666DDF #DF666D #6DDF66

tetradic

#666DDF #DF66A9 #DFD866 #66DF9B

square

#666DDF #DF66A9 #DFD866 #66DF9B

split-complementary

#666DDF #DF9B66 #A9DF66

monochromatic

#232BA8 #333DD4 #666DDF #999DEA #CBCEF4

Accessibility & contrast

On white

4.36

#666DDF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.82

#666DDF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DDF

4.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DDF	#FFFFFF	#000000	##000000
##666DDF	1.00	4.36	4.82	4.82
#FFFFFF	4.36	1.00	21.00	21.00
#000000	4.82	21.00	1.00	1.00
##000000	4.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#307EE3

Deuteranopia (green-blind)

#1D74DD

Tritanopia (blue-blind)

#2A879C

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #666ddf;
/* rgb */ color: rgb(102, 109, 223);
/* oklch */ color: oklch(58.7% 0.171 277.1);

Tailwind

colors: {
  custom: {
    50: '#9a96ea',
    500: '#666ddf',
    950: '#000000',
  },
}

SCSS

$custom: #666ddf;
$custom-light: #9a96ea;
$custom-dark: #000000;

JSON

{
  "hex": "#666ddf",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 223
  },
  "hsl": {
    "h": 236.529,
    "s": 65.405,
    "l": 63.725
  },
  "oklch": {
    "l": 0.58723,
    "c": 0.17062,
    "h": 277.1
  },
  "luminance": 0.1909
}

Semantic roles & 50–950 ramp

primary

#666DDF

secondary

#E6E3BB

accent

#C318CD

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666DDF

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

Preview Lab → · Contrast checker → · Palette generator →