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Running Number
6,728,112
HEX
#66A9B0
RGB
102, 169, 176
HSL
186°,32%,55%
HSV
186°,42%,69%
CMYK
42%,4%,0%,31%
Brightness
59%
Type
Light
AA Normal Text: ≥ 4.5:1
AA Large Text: ≥ 3.0:1
AAA Normal Text: ≥ 7.0:1
AAA Large Text: ≥ 4.5:1
#66A9B0 sits at 186° on the color wheel, placing it in the cyan family of the cool half of the spectrum. With 32% saturation and 55% lightness, it reads as a softly muted, light tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 102, 169, 176 produces a 7.87:1 contrast ratio against black, which clears WCAG AAA for body text in that pairing.
In RGB space #66A9B0 is a clear variant of CSS steel blue — about 51 units away from #4682B4. Designers reach for cyan 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 #66A9B0 in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#66a9b0";💡 Click any tab to see how to use #66a9b0 in different programming languages