#666FDD#666FDD

#666FDD is a mid, vivid blue. Relative luminance 0.194; OKLCH L 59.0% C 0.165 H 276.6°. Best body text is #000000 at 4.88:1 contrast (WCAG AA passes).

Color values

HEX	#666FDD
RGB	rgb(102, 111, 221)
HSL	hsl(235, 64%, 63%)
HSV	hsv(235, 54%, 87%)
CMYK	cmyk(53.8%, 49.8%, 0%, 13.3%)
CIE-LAB	lab(51.17, 27.44, -57.52)
CIE-LCH	lch(51.17, 63.73, 295.51°)
OKLab	oklab(58.97% 0.0189 -0.1642)
OKLCH	oklch(58.97% 0.165 276.6)
XYZ	xyz(24.2109, 19.4125, 70.8638)
Luminance	0.1941 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FDD #DDD466

analogous

#66AADD #666FDD #9866DD

triadic

#666FDD #DD666F #6FDD66

tetradic

#666FDD #DD66AA #DDD466 #66DD98

square

#666FDD #DD66AA #DDD466 #66DD98

split-complementary

#666FDD #DD9866 #AADD66

monochromatic

#242EA4 #3440D2 #666FDD #989EE8 #CACDF3

Accessibility & contrast

On white

4.30

#666FDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.88

#666FDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FDD

4.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FDD	#FFFFFF	#000000	##000000
##666FDD	1.00	4.30	4.88	4.88
#FFFFFF	4.30	1.00	21.00	21.00
#000000	4.88	21.00	1.00	1.00
##000000	4.88	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#387FE1

Deuteranopia (green-blind)

#2875DB

Tritanopia (blue-blind)

#2C889C

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #666fdd;
/* rgb */ color: rgb(102, 111, 221);
/* oklch */ color: oklch(59.0% 0.165 276.6);

Tailwind

colors: {
  custom: {
    50: '#9a98e8',
    500: '#666fdd',
    950: '#000000',
  },
}

SCSS

$custom: #666fdd;
$custom-light: #9a98e8;
$custom-dark: #000000;

JSON

{
  "hex": "#666fdd",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 221
  },
  "hsl": {
    "h": 235.462,
    "s": 63.636,
    "l": 63.333
  },
  "oklch": {
    "l": 0.58966,
    "c": 0.16526,
    "h": 276.6
  },
  "luminance": 0.19414
}

Semantic roles & 50–950 ramp

primary

#666FDD

secondary

#E5E1BA

accent

#BE1ACB

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666FDD

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

Preview Lab → · Contrast checker → · Palette generator →