Palettes / Colors / #666D64

#666D64 — Stone Grey

#666D64 is a gray color we call Stone Grey, closest to the named color DimGray (#696969). It belongs to the gray family.

#666D64 is a neutral gray color associated with neutrality and professionalism. It sits comfortably in the middle: usable for large areas in soft schemes, or as a supporting color beside something stronger.

Its strongest partner is its complement #6B646D; it also sits naturally between #6A6D64 and #646D67. In the palettes below you can see it working alongside real color combinations from our collection.

Copy HEX Copy RGB Copy HSL Download PNG swatch SVG

Color values

RGB & CMYK percentages

Red 40% · Green 43% · Blue 39%

Cyan 6% · Magenta 0% · Yellow 8% · Key 57%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #666D64

.text { color: #666D64; }
.background { background-color: #666D64; }
.border { border: 3px solid #666D64; }
.text-rgb { color: rgb(102, 109, 100); }
.text-hsl { color: hsl(107, 4%, 41%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #666D64; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(102, 109, 100, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #666D64; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(102, 109, 100, 0.8); }

HTML: <p style="color:#666D64">Text here</p> · <div style="background-color:#666D64">Div content here</div>

Shades of #666D64

Tints of #666D64

Tones of #666D64

Color harmonies

Complementary — #6B646D:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #666D64: #FFFFFF.

How #666D64 looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #666D64 rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #666D63  ·  #666D65 →

Frequently asked questions

What color is #666D64?

#666D64 is Stone Grey, a gray color (RGB 102, 109, 100). Its closest standard named color is DimGray.

What is the RGB and HSL of #666D64?

#666D64 is RGB 102, 109, 100 — HSL 107°, 4%, 41% — CMYK 6%, 0%, 8%, 57%.

What colors go with #666D64?

Its complement is #6B646D; analogous partners are #6A6D64 and #646D67. It also appears in 6+ palettes in our collection.

Can I use #666D64 for text?

White text on #666D64 has a contrast ratio of 5.33:1 (passes WCAG AA); black text gives 3.94:1.