#666BC5#666BC5

#666BC5 is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.7% C 0.137 H 278.7°. Best body text is #FFFFFF at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#666BC5
RGB	rgb(102, 107, 197)
HSL	hsl(237, 45%, 59%)
HSV	hsv(237, 48%, 77%)
CMYK	cmyk(48.2%, 45.7%, 0%, 22.7%)
CIE-LAB	lab(48.72, 22.39, -47.76)
CIE-LCH	lch(48.72, 52.74, 295.12°)
OKLab	oklab(56.66% 0.0207 -0.1355)
OKLCH	oklch(56.66% 0.137 278.7)
XYZ	xyz(20.8121, 17.3703, 55.0686)
Luminance	0.1737 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BC5 #C5C066

analogous

#669AC5 #666BC5 #9066C5

triadic

#666BC5 #C5666B #6BC566

tetradic

#666BC5 #C5669A #C5C066 #66C590

square

#666BC5 #C5669A #C5C066 #66C590

split-complementary

#666BC5 #C59066 #9AC566

monochromatic

#313580 #4147AC #666BC5 #9296D6 #BFC1E7

Accessibility & contrast

On white

4.69

#666BC5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.47

#666BC5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BC5

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BC5	#FFFFFF	#000000	##FFFFFF
##666BC5	1.00	4.69	4.47	4.69
#FFFFFF	4.69	1.00	21.00	1.00
#000000	4.47	21.00	1.00	21.00
##FFFFFF	4.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4678C8

Deuteranopia (green-blind)

#3E70C3

Tritanopia (blue-blind)

#437E8E

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666bc5;
/* rgb */ color: rgb(102, 107, 197);
/* oklch */ color: oklch(56.7% 0.137 278.7);

Tailwind

colors: {
  custom: {
    50: '#9795d7',
    500: '#666bc5',
    950: '#000000',
  },
}

SCSS

$custom: #666bc5;
$custom-light: #9795d7;
$custom-dark: #000000;

JSON

{
  "hex": "#666bc5",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 197
  },
  "hsl": {
    "h": 236.842,
    "s": 45.024,
    "l": 58.627
  },
  "oklch": {
    "l": 0.56659,
    "c": 0.1371,
    "h": 278.7
  },
  "luminance": 0.17371
}

Semantic roles & 50–950 ramp

primary

#666BC5

secondary

#D6D4B1

accent

#CE53D5

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666BC5

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

Preview Lab → · Contrast checker → · Palette generator →