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💡 Click on any color value below to copy it to clipboard
Running Number
6,520,203
HEX
#637D8B
RGB
99, 125, 139
HSL
201°,17%,47%
HSV
201°,29%,55%
CMYK
29%,10%,0%,45%
Brightness
47%
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
#637D8B sits at 201° on the color wheel, placing it in the azure family of the cool half of the spectrum. With 17% saturation and 47% lightness, it reads as a heavily muted, balanced tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 99, 125, 139 produces a 4.84:1 contrast ratio against black, which clears WCAG AA for body text in that pairing.
In RGB space #637D8B is a clear variant of CSS gray — about 31 units away from #808080. Designers reach for azure hues at this saturation when the brief calls for restraint and atmosphere, 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 #637D8B in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#637d8b";💡 Click any tab to see how to use #637d8b in different programming languages