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Running Number
6,712,429
HEX
#666C6D
RGB
102, 108, 109
HSL
189°,3%,41%
HSV
189°,6%,43%
CMYK
6%,1%,0%,57%
Brightness
42%
Type
Dark
AA Normal Text: ≥ 4.5:1
AA Large Text: ≥ 3.0:1
AAA Normal Text: ≥ 7.0:1
AAA Large Text: ≥ 4.5:1
#666C6D sits at 189° on the color wheel, placing it in the cyan family of the cool half of the spectrum. With 3% saturation and 41% lightness, it reads as a effectively achromatic, shadowed tone — a quiet, restrained presence that recedes rather than competes. Its RGB mix of 102, 108, 109 produces a 5.34:1 contrast ratio against white, which clears WCAG AA for body text in that pairing.
In RGB space #666C6D is essentially indistinguishable from CSS dim gray at this fidelity — about 6 units away from #696969. Designers reach for cyan hues at this saturation when the brief calls for restraint and atmosphere, and at this lightness when they want a present, comfortable mid-canvas voice. On screen the cool cast tends to pair best with warm neutrals in the 25°-45° range to add life.
See how this color appears in real UI elements
Button (filled)
Badge
Progress Bar
Link Hover
Input Focus Ring
Checkbox Active
Toggle Switch On
Slider Thumb
Card Border
Icon Highlight
Tooltip Background
Modal Header
Tab Active
Alert Box
Timeline Dot
Loading Spinner
Dropdown Selected
Table Row Highlight
Calendar Date
Mobile Device
See how to use #666C6D in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#666c6d";💡 Click any tab to see how to use #666c6d in different programming languages