#666FD9#666FD9

#666FD9 is a mid, vivid blue. Relative luminance 0.192; OKLCH L 58.7% C 0.160 H 276.6°. Best body text is #000000 at 4.84:1 contrast (WCAG AA passes).

Color values

HEX	#666FD9
RGB	rgb(102, 111, 217)
HSL	hsl(235, 60%, 63%)
HSV	hsv(235, 53%, 85%)
CMYK	cmyk(53%, 48.8%, 0%, 14.9%)
CIE-LAB	lab(50.92, 26.18, -55.65)
CIE-LCH	lch(50.92, 61.50, 295.19°)
OKLab	oklab(58.7% 0.0185 -0.1587)
OKLCH	oklch(58.7% 0.16 276.6)
XYZ	xyz(23.6843, 19.2019, 68.0905)
Luminance	0.1920 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FD9 #D9D066

analogous

#66A9D9 #666FD9 #9666D9

triadic

#666FD9 #D9666F #6FD966

tetradic

#666FD9 #D966A9 #D9D066 #66D996

square

#666FD9 #D966A9 #D9D066 #66D996

split-complementary

#666FD9 #D99666 #A9D966

monochromatic

#27309D #3541CD #666FD9 #979DE5 #C8CBF1

Accessibility & contrast

On white

4.34

#666FD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.84

#666FD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FD9

4.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FD9	#FFFFFF	#000000	##000000
##666FD9	1.00	4.34	4.84	4.84
#FFFFFF	4.34	1.00	21.00	21.00
#000000	4.84	21.00	1.00	1.00
##000000	4.84	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C7EDD

Deuteranopia (green-blind)

#2E75D7

Tritanopia (blue-blind)

#31869A

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #666fd9;
/* rgb */ color: rgb(102, 111, 217);
/* oklch */ color: oklch(58.7% 0.160 276.6);

Tailwind

colors: {
  custom: {
    50: '#9998e5',
    500: '#666fd9',
    950: '#000000',
  },
}

SCSS

$custom: #666fd9;
$custom-light: #9998e5;
$custom-dark: #000000;

JSON

{
  "hex": "#666fd9",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 217
  },
  "hsl": {
    "h": 235.304,
    "s": 60.209,
    "l": 62.549
  },
  "oklch": {
    "l": 0.58704,
    "c": 0.15975,
    "h": 276.6
  },
  "luminance": 0.19203
}

Semantic roles & 50–950 ramp

primary

#666FD9

secondary

#E2DFB8

accent

#BB1EC8

background

#F9F9FE

surface

#F2F2FC

border

#CCCCD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666FD9

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

Preview Lab → · Contrast checker → · Palette generator →