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Running Number
6,519,646
HEX
#637B5E
RGB
99, 123, 94
HSL
110°,13%,43%
HSV
110°,24%,48%
CMYK
20%,0%,24%,52%
Brightness
44%
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
#637B5E sits at 110° on the color wheel, placing it in the green family of the cool half of the spectrum. With 13% saturation and 43% lightness, it reads as a heavily muted, shadowed tone — a quiet, restrained presence that recedes rather than competes. Its RGB mix of 99, 123, 94 produces a 4.64:1 contrast ratio against white, which clears WCAG AA for body text in that pairing.
In RGB space #637B5E is a close cousin of CSS dim gray — about 22 units away from #696969. Designers reach for green 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 #637B5E in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#637b5e";💡 Click any tab to see how to use #637b5e in different programming languages