#645C66#645C66

#645C66 is a mid, near-neutral grey. Relative luminance 0.113; OKLCH L 48.6% C 0.019 H 319.5°. Best body text is #FFFFFF at 6.43:1 contrast (WCAG AA passes).

Color values

HEX	#645C66
RGB	rgb(100, 92, 102)
HSL	hsl(288, 5%, 38%)
HSV	hsv(288, 10%, 40%)
CMYK	cmyk(2%, 9.8%, 0%, 60%)
CIE-LAB	lab(40.12, 5.27, -4.54)
CIE-LCH	lch(40.12, 6.96, 319.22°)
OKLab	oklab(48.58% 0.0142 -0.0121)
OKLCH	oklch(48.58% 0.019 319.5)
XYZ	xyz(11.4806, 11.3230, 14.1485)
Luminance	0.1132 (WCAG relative)
Temperature	neutral
Family	grey

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#645C66 #5E665C

analogous

#5F5C66 #645C66 #665C63

triadic

#645C66 #66645C #5C6664

tetradic

#645C66 #665F5C #5E665C #5C6366

square

#645C66 #665F5C #5E665C #5C6366

split-complementary

#645C66 #63665C #5C665F

monochromatic

#252226 #443F46 #645C66 #847986 #A199A3

Accessibility & contrast

On white

6.43

#645C66 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.26

#645C66 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #645C66

6.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##645C66	#FFFFFF	#000000	##FFFFFF
##645C66	1.00	6.43	3.26	6.43
#FFFFFF	6.43	1.00	21.00	1.00
#000000	3.26	21.00	1.00	21.00
##FFFFFF	6.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5B5E66

Deuteranopia (green-blind)

#5D5F66

Tritanopia (blue-blind)

#645D5F

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #645c66;
/* rgb */ color: rgb(100, 92, 102);
/* oklch */ color: oklch(48.6% 0.019 319.5);

Tailwind

colors: {
  custom: {
    50: '#908a91',
    500: '#645c66',
    950: '#000000',
  },
}

SCSS

$custom: #645c66;
$custom-light: #908a91;
$custom-dark: #000000;

JSON

{
  "hex": "#645c66",
  "rgb": {
    "r": 100,
    "g": 92,
    "b": 102
  },
  "hsl": {
    "h": 288,
    "s": 5.155,
    "l": 38.039
  },
  "oklch": {
    "l": 0.48578,
    "c": 0.01862,
    "h": 319.5
  },
  "luminance": 0.11323
}

Semantic roles & 50–950 ramp

primary

#645C66

secondary

#8C938B

accent

#AE7A84

background

#F8F8F8

surface

#F0F0F0

border

#CBCBCB

text

#0C0B0C

muted

#7D7C7D

Preview Lab

Preview with #645C66

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

Preview Lab → · Contrast checker → · Palette generator →