#666FBB#666FBB

#666FBB is a mid, moderate blue. Relative luminance 0.178; OKLCH L 56.9% C 0.117 H 276.9°. Best body text is #FFFFFF at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#666FBB
RGB	rgb(102, 111, 187)
HSL	hsl(234, 38%, 57%)
HSV	hsv(234, 45%, 73%)
CMYK	cmyk(45.5%, 40.6%, 0%, 26.7%)
CIE-LAB	lab(49.23, 16.88, -41.19)
CIE-LCH	lch(49.23, 44.52, 292.29°)
OKLab	oklab(56.87% 0.014 -0.1163)
OKLCH	oklch(56.87% 0.117 276.9)
XYZ	xyz(20.1308, 17.7805, 49.3753)
Luminance	0.1778 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FBB #BBB266

analogous

#669ABB #666FBB #8866BB

triadic

#666FBB #BB666F #6FBB66

tetradic

#666FBB #BB669A #BBB266 #66BB88

square

#666FBB #BB669A #BBB266 #66BB88

split-complementary

#666FBB #BB8866 #9ABB66

monochromatic

#333A73 #464F9E #666FBB #9097CE #BBBFE1

Accessibility & contrast

On white

4.61

#666FBB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.56

#666FBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666FBB

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FBB	#FFFFFF	#000000	##FFFFFF
##666FBB	1.00	4.61	4.56	4.61
#FFFFFF	4.61	1.00	21.00	1.00
#000000	4.56	21.00	1.00	21.00
##FFFFFF	4.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5378BE

Deuteranopia (green-blind)

#4C72B9

Tritanopia (blue-blind)

#497F8C

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666fbb;
/* rgb */ color: rgb(102, 111, 187);
/* oklch */ color: oklch(56.9% 0.117 276.9);

Tailwind

colors: {
  custom: {
    50: '#9698d0',
    500: '#666fbb',
    950: '#000000',
  },
}

SCSS

$custom: #666fbb;
$custom-light: #9698d0;
$custom-dark: #000000;

JSON

{
  "hex": "#666fbb",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 187
  },
  "hsl": {
    "h": 233.647,
    "s": 38.462,
    "l": 56.667
  },
  "oklch": {
    "l": 0.56867,
    "c": 0.11715,
    "h": 276.9
  },
  "luminance": 0.17782
}

Semantic roles & 50–950 ramp

primary

#666FBB

secondary

#D0CCAD

accent

#C259CE

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666FBB

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

Preview Lab → · Contrast checker → · Palette generator →