#646E66#646E66

#646E66 is a mid, near-neutral grey. Relative luminance 0.148; OKLCH L 52.7% C 0.017 H 151.5°. Best body text is #FFFFFF at 5.30:1 contrast (WCAG AA passes).

Color values

HEX	#646E66
RGB	rgb(100, 110, 102)
HSL	hsl(132, 5%, 41%)
HSV	hsv(132, 9%, 43%)
CMYK	cmyk(9.1%, 0%, 7.3%, 56.9%)
CIE-LAB	lab(45.39, -5.48, 3.17)
CIE-LCH	lch(45.39, 6.33, 149.98°)
OKLab	oklab(52.72% -0.0152 0.0083)
OKLCH	oklch(52.72% 0.017 151.5)
XYZ	xyz(13.2292, 14.8203, 14.7314)
Luminance	0.1482 (WCAG relative)
Temperature	neutral
Family	grey

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#646E66 #6E646C

analogous

#676E64 #646E66 #646E6B

triadic

#646E66 #66646E #6E6664

tetradic

#646E66 #64676E #6E646C #6E6B64

square

#646E66 #64676E #6E646C #6E6B64

split-complementary

#646E66 #6B646E #6E6467

monochromatic

#2A2E2B #474E48 #646E66 #828D84 #A2AAA4

Accessibility & contrast

On white

5.30

#646E66 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.96

#646E66 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #646E66

5.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##646E66	#FFFFFF	#000000	##FFFFFF
##646E66	1.00	5.30	3.96	5.30
#FFFFFF	5.30	1.00	21.00	1.00
#000000	3.96	21.00	1.00	21.00
##FFFFFF	5.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#6E6C66

Deuteranopia (green-blind)

#6C6B66

Tritanopia (blue-blind)

#636E6C

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #646e66;
/* rgb */ color: rgb(100, 110, 102);
/* oklch */ color: oklch(52.7% 0.017 151.5);

Tailwind

colors: {
  custom: {
    50: '#909791',
    500: '#646e66',
    950: '#000000',
  },
}

SCSS

$custom: #646e66;
$custom-light: #909791;
$custom-dark: #000000;

JSON

{
  "hex": "#646e66",
  "rgb": {
    "r": 100,
    "g": 110,
    "b": 102
  },
  "hsl": {
    "h": 132,
    "s": 4.762,
    "l": 41.176
  },
  "oklch": {
    "l": 0.52718,
    "c": 0.01732,
    "h": 151.5
  },
  "luminance": 0.1482
}

Semantic roles & 50–950 ramp

primary

#646E66

secondary

#9A9399

accent

#7AA4AE

background

#F8F9F8

surface

#F0F2F0

border

#CBCCCB

text

#0C0D0C

muted

#7D7E7D

Preview Lab

Preview with #646E66

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

Preview Lab → · Contrast checker → · Palette generator →