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💡 Click on any color value below to copy it to clipboard
Running Number
73,199
HEX
#011DEF
RGB
1, 29, 239
HSL
233°,99%,47%
HSV
233°,100%,94%
CMYK
100%,88%,0%,6%
Brightness
17%
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
#011DEF sits at 233° on the color wheel, placing it in the blue family of the cool half of the spectrum. With 99% saturation and 47% lightness, it reads as a fully saturated, balanced tone — an immediate, signal-grade voice that demands attention. Its RGB mix of 1, 29, 239 produces a 8.67:1 contrast ratio against white, which clears WCAG AAA for body text in that pairing.
In RGB space #011DEF is a clear variant of CSS blue — about 33 units away from #0000FF. Designers reach for blue 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 #011DEF in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#011def";💡 Click any tab to see how to use #011def in different programming languages