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💡 Click on any color value below to copy it to clipboard
Running Number
2,052,581
HEX
#1F51E5
RGB
31, 81, 229
HSL
225°,79%,51%
HSV
225°,86%,90%
CMYK
86%,65%,0%,10%
Brightness
33%
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
#1F51E5 sits at 225° on the color wheel, placing it in the blue family of the cool half of the spectrum. With 79% saturation and 51% lightness, it reads as a richly saturated, balanced tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 31, 81, 229 produces a 6.24:1 contrast ratio against white, which clears WCAG AA for body text in that pairing.
In RGB space #1F51E5 is a clear variant of CSS royal blue — about 42 units away from #4169E1. 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 #1F51E5 in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#1f51e5";💡 Click any tab to see how to use #1f51e5 in different programming languages