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💡 Click on any color value below to copy it to clipboard
Running Number
4,168,159
HEX
#3F99DF
RGB
63, 153, 223
HSL
206°,71%,56%
HSV
206°,72%,87%
CMYK
72%,31%,0%,13%
Brightness
53%
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
#3F99DF sits at 206° on the color wheel, placing it in the azure family of the cool half of the spectrum. With 71% saturation and 56% lightness, it reads as a richly saturated, light tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 63, 153, 223 produces a 6.83:1 contrast ratio against black, which clears WCAG AA for body text in that pairing.
In RGB space #3F99DF is a clear variant of CSS royal blue — about 48 units away from #4169E1. Designers reach for azure hues at this saturation when the brief calls for bold, immediate signal, 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 #3F99DF in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#3f99df";💡 Click any tab to see how to use #3f99df in different programming languages