#666FCB#666FCB

#666FCB is a mid, vivid blue. Relative luminance 0.185; OKLCH L 57.8% C 0.140 H 276.9°. Best body text is #000000 at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#666FCB
RGB	rgb(102, 111, 203)
HSL	hsl(235, 49%, 60%)
HSV	hsv(235, 50%, 80%)
CMYK	cmyk(49.8%, 45.3%, 0%, 20.4%)
CIE-LAB	lab(50.10, 21.79, -48.99)
CIE-LCH	lch(50.10, 53.62, 293.98°)
OKLab	oklab(57.82% 0.0168 -0.1391)
OKLCH	oklch(57.82% 0.14 276.9)
XYZ	xyz(21.9401, 18.5042, 58.9039)
Luminance	0.1850 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FCB #CBC266

analogous

#66A2CB #666FCB #8F66CB

triadic

#666FCB #CB666F #6FCB66

tetradic

#666FCB #CB66A2 #CBC266 #66CB8F

square

#666FCB #CB66A2 #CBC266 #66CB8F

split-complementary

#666FCB #CB8F66 #A2CB66

monochromatic

#2E3688 #3E49B6 #666FCB #949ADB #C1C5EA

Accessibility & contrast

On white

4.47

#666FCB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.70

#666FCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FCB

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FCB	#FFFFFF	#000000	##000000
##666FCB	1.00	4.47	4.70	4.70
#FFFFFF	4.47	1.00	21.00	21.00
#000000	4.70	21.00	1.00	1.00
##000000	4.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#487BCE

Deuteranopia (green-blind)

#3F73C9

Tritanopia (blue-blind)

#3E8393

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666fcb;
/* rgb */ color: rgb(102, 111, 203);
/* oklch */ color: oklch(57.8% 0.140 276.9);

Tailwind

colors: {
  custom: {
    50: '#9898db',
    500: '#666fcb',
    950: '#000000',
  },
}

SCSS

$custom: #666fcb;
$custom-light: #9898db;
$custom-dark: #000000;

JSON

{
  "hex": "#666fcb",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 203
  },
  "hsl": {
    "h": 234.653,
    "s": 49.268,
    "l": 59.804
  },
  "oklch": {
    "l": 0.57817,
    "c": 0.14015,
    "h": 276.9
  },
  "luminance": 0.18505
}

Semantic roles & 50–950 ramp

primary

#666FCB

secondary

#DAD6B3

accent

#CD4FD9

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FCB

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

Preview Lab → · Contrast checker → · Palette generator →