#666FCF#666FCF

#666FCF is a mid, vivid blue. Relative luminance 0.187; OKLCH L 58.1% C 0.146 H 276.8°. Best body text is #000000 at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#666FCF
RGB	rgb(102, 111, 207)
HSL	hsl(235, 52%, 61%)
HSV	hsv(235, 51%, 81%)
CMYK	cmyk(50.7%, 46.4%, 0%, 18.8%)
CIE-LAB	lab(50.33, 23.04, -50.91)
CIE-LCH	lch(50.33, 55.88, 294.35°)
OKLab	oklab(58.07% 0.0173 -0.1448)
OKLCH	oklch(58.07% 0.146 276.8)
XYZ	xyz(22.4229, 18.6973, 61.4468)
Luminance	0.1870 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FCF #CFC666

analogous

#66A3CF #666FCF #9166CF

triadic

#666FCF #CF666F #6FCF66

tetradic

#666FCF #CF66A3 #CFC666 #66CF91

square

#666FCF #CF66A3 #CFC666 #66CF91

split-complementary

#666FCF #CF9166 #A3CF66

monochromatic

#2D358E #3B46BD #666FCF #959BDE #C3C7EC

Accessibility & contrast

On white

4.43

#666FCF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.74

#666FCF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FCF

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FCF	#FFFFFF	#000000	##000000
##666FCF	1.00	4.43	4.74	4.74
#FFFFFF	4.43	1.00	21.00	21.00
#000000	4.74	21.00	1.00	1.00
##000000	4.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#457CD3

Deuteranopia (green-blind)

#3B74CD

Tritanopia (blue-blind)

#3B8495

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666fcf;
/* rgb */ color: rgb(102, 111, 207);
/* oklch */ color: oklch(58.1% 0.146 276.8);

Tailwind

colors: {
  custom: {
    50: '#9898de',
    500: '#666fcf',
    950: '#000000',
  },
}

SCSS

$custom: #666fcf;
$custom-light: #9898de;
$custom-dark: #000000;

JSON

{
  "hex": "#666fcf",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 207
  },
  "hsl": {
    "h": 234.857,
    "s": 52.239,
    "l": 60.588
  },
  "oklch": {
    "l": 0.58065,
    "c": 0.14581,
    "h": 276.8
  },
  "luminance": 0.18699
}

Semantic roles & 50–950 ramp

primary

#666FCF

secondary

#DCD9B4

accent

#B226C0

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FCF

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

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