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💡 Click on any color value below to copy it to clipboard
Running Number
6,710,136
HEX
#666378
RGB
102, 99, 120
HSL
249°,10%,43%
HSV
249°,17%,47%
CMYK
15%,18%,0%,53%
Brightness
40%
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
#666378 sits at 249° on the color wheel, placing it in the blue family of the cool half of the spectrum. With 10% saturation and 43% lightness, it reads as a heavily muted, shadowed tone — a quiet, restrained presence that recedes rather than competes. Its RGB mix of 102, 99, 120 produces a 5.80:1 contrast ratio against white, which clears WCAG AA for body text in that pairing.
In RGB space #666378 is a close cousin of CSS dim gray — about 16 units away from #696969. Designers reach for blue 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 #666378 in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#666378";💡 Click any tab to see how to use #666378 in different programming languages