#666FBC#666FBC

#666FBC is a mid, moderate blue. Relative luminance 0.178; OKLCH L 56.9% C 0.119 H 276.9°. Best body text is #FFFFFF at 4.60:1 contrast (WCAG AA passes).

Color values

HEX	#666FBC
RGB	rgb(102, 111, 188)
HSL	hsl(234, 39%, 57%)
HSV	hsv(234, 46%, 74%)
CMYK	cmyk(45.7%, 41%, 0%, 26.3%)
CIE-LAB	lab(49.28, 17.19, -41.69)
CIE-LCH	lch(49.28, 45.09, 292.41°)
OKLab	oklab(56.92% 0.0142 -0.1177)
OKLCH	oklch(56.92% 0.119 276.9)
XYZ	xyz(20.2383, 17.8235, 49.9411)
Luminance	0.1782 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FBC #BCB366

analogous

#669ABC #666FBC #8866BC

triadic

#666FBC #BC666F #6FBC66

tetradic

#666FBC #BC669A #BCB366 #66BC88

square

#666FBC #BC669A #BCB366 #66BC88

split-complementary

#666FBC #BC8866 #9ABC66

monochromatic

#333A75 #464F9F #666FBC #9197CF #BBBFE1

Accessibility & contrast

On white

4.60

#666FBC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.56

#666FBC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666FBC

4.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FBC	#FFFFFF	#000000	##FFFFFF
##666FBC	1.00	4.60	4.56	4.60
#FFFFFF	4.60	1.00	21.00	1.00
#000000	4.56	21.00	1.00	21.00
##FFFFFF	4.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5279BF

Deuteranopia (green-blind)

#4B72BA

Tritanopia (blue-blind)

#487F8C

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666fbc;
/* rgb */ color: rgb(102, 111, 188);
/* oklch */ color: oklch(56.9% 0.119 276.9);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#666fbc",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 188
  },
  "hsl": {
    "h": 233.721,
    "s": 39.091,
    "l": 56.863
  },
  "oklch": {
    "l": 0.56924,
    "c": 0.11861,
    "h": 276.9
  },
  "luminance": 0.17824
}

Semantic roles & 50–950 ramp

primary

#666FBC

secondary

#D0CDAD

accent

#C359CF

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666FBC

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

Preview Lab → · Contrast checker → · Palette generator →