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Running Number
6,712,515
HEX
#666CC3
RGB
102, 108, 195
HSL
236°,44%,58%
HSV
236°,48%,76%
CMYK
48%,45%,0%,24%
Brightness
46%
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
#666CC3 sits at 236° on the color wheel, placing it in the blue family of the cool half of the spectrum. With 44% saturation and 58% lightness, it reads as a moderately saturated, light tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 102, 108, 195 produces a 4.67:1 contrast ratio against white, which clears WCAG AA for body text in that pairing.
In RGB space #666CC3 is a close cousin of CSS #6A5ACD — about 21 units away from #6A5ACD. Designers reach for blue hues at this saturation when the brief calls for a conversational, mid-energy register, 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 #666CC3 in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#666cc3";💡 Click any tab to see how to use #666cc3 in different programming languages