#645A66#645A66

#645A66 is a mid, muted grey. Relative luminance 0.110; OKLCH L 48.1% C 0.023 H 320.6°. Best body text is #FFFFFF at 6.57:1 contrast (WCAG AA passes).

Color values

HEX	#645A66
RGB	rgb(100, 90, 102)
HSL	hsl(290, 6%, 38%)
HSV	hsv(290, 12%, 40%)
CMYK	cmyk(2%, 11.8%, 0%, 60%)
CIE-LAB	lab(39.55, 6.49, -5.39)
CIE-LCH	lch(39.55, 8.44, 320.30°)
OKLab	oklab(48.13% 0.0175 -0.0144)
OKLCH	oklch(48.13% 0.023 320.6)
XYZ	xyz(11.3096, 10.9811, 14.0916)
Luminance	0.1098 (WCAG relative)
Temperature	neutral
Family	grey

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#645A66 #5C665A

analogous

#5E5A66 #645A66 #665A62

triadic

#645A66 #66645A #5A6664

tetradic

#645A66 #665E5A #5C665A #5A6266

square

#645A66 #665E5A #5C665A #5A6266

split-complementary

#645A66 #62665A #5A665E

monochromatic

#242125 #443D45 #645A66 #847787 #A197A3

Accessibility & contrast

On white

6.57

#645A66 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.20

#645A66 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #645A66

6.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##645A66	#FFFFFF	#000000	##FFFFFF
##645A66	1.00	6.57	3.20	6.57
#FFFFFF	6.57	1.00	21.00	1.00
#000000	3.20	21.00	1.00	21.00
##FFFFFF	6.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#595C67

Deuteranopia (green-blind)

#5B5E66

Tritanopia (blue-blind)

#645B5E

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #645a66;
/* rgb */ color: rgb(100, 90, 102);
/* oklch */ color: oklch(48.1% 0.023 320.6);

Tailwind

colors: {
  custom: {
    50: '#908891',
    500: '#645a66',
    950: '#000000',
  },
}

SCSS

$custom: #645a66;
$custom-light: #908891;
$custom-dark: #000000;

JSON

{
  "hex": "#645a66",
  "rgb": {
    "r": 100,
    "g": 90,
    "b": 102
  },
  "hsl": {
    "h": 290,
    "s": 6.25,
    "l": 37.647
  },
  "oklch": {
    "l": 0.48133,
    "c": 0.02266,
    "h": 320.6
  },
  "luminance": 0.10981
}

Semantic roles & 50–950 ramp

primary

#645A66

secondary

#8B9389

accent

#AF7882

background

#F8F8F8

surface

#F0EFF0

border

#CBCACB

text

#0C0B0C

muted

#7D7C7D

Preview Lab

Preview with #645A66

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

Preview Lab → · Contrast checker → · Palette generator →