#666FC8#666FC8

#666FC8 is a mid, vivid blue. Relative luminance 0.184; OKLCH L 57.6% C 0.136 H 276.9°. Best body text is #000000 at 4.67:1 contrast (WCAG AA passes).

Color values

HEX	#666FC8
RGB	rgb(102, 111, 200)
HSL	hsl(234, 47%, 59%)
HSV	hsv(234, 49%, 78%)
CMYK	cmyk(49%, 44.5%, 0%, 21.6%)
CIE-LAB	lab(49.93, 20.86, -47.55)
CIE-LCH	lch(49.93, 51.92, 293.69°)
OKLab	oklab(57.63% 0.0163 -0.1349)
OKLCH	oklch(57.63% 0.136 276.9)
XYZ	xyz(21.5860, 18.3626, 57.0393)
Luminance	0.1836 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FC8 #C8BF66

analogous

#66A0C8 #666FC8 #8E66C8

triadic

#666FC8 #C8666F #6FC866

tetradic

#666FC8 #C866A0 #C8BF66 #66C88E

square

#666FC8 #C866A0 #C8BF66 #66C88E

split-complementary

#666FC8 #C88E66 #A0C866

monochromatic

#2F3784 #404AB1 #666FC8 #9399D8 #C0C4E8

Accessibility & contrast

On white

4.49

#666FC8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.67

#666FC8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FC8

4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FC8	#FFFFFF	#000000	##000000
##666FC8	1.00	4.49	4.67	4.67
#FFFFFF	4.49	1.00	21.00	21.00
#000000	4.67	21.00	1.00	1.00
##000000	4.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A7BCB

Deuteranopia (green-blind)

#4273C6

Tritanopia (blue-blind)

#408292

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666fc8;
/* rgb */ color: rgb(102, 111, 200);
/* oklch */ color: oklch(57.6% 0.136 276.9);

Tailwind

colors: {
  custom: {
    50: '#9798d9',
    500: '#666fc8',
    950: '#000000',
  },
}

SCSS

$custom: #666fc8;
$custom-light: #9798d9;
$custom-dark: #000000;

JSON

{
  "hex": "#666fc8",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 200
  },
  "hsl": {
    "h": 234.49,
    "s": 47.115,
    "l": 59.216
  },
  "oklch": {
    "l": 0.57634,
    "c": 0.13589,
    "h": 276.9
  },
  "luminance": 0.18364
}

Semantic roles & 50–950 ramp

primary

#666FC8

secondary

#D8D5B2

accent

#CA51D7

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FC8

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

Preview Lab → · Contrast checker → · Palette generator →