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💡 Click on any color value below to copy it to clipboard
Running Number
2,227,547
HEX
#21FD5B
RGB
33, 253, 91
HSL
136°,98%,56%
HSV
136°,87%,99%
CMYK
87%,0%,64%,1%
Brightness
66%
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
#21FD5B sits at 136° on the color wheel, placing it in the spring green family of the cool half of the spectrum. With 98% saturation and 56% lightness, it reads as a fully saturated, light tone — an immediate, signal-grade voice that demands attention. Its RGB mix of 33, 253, 91 produces a 15.27:1 contrast ratio against black, which clears WCAG AAA for body text in that pairing.
In RGB space #21FD5B is a distant relative of CSS medium spring green — about 71 units away from #00FA9A. Designers reach for spring green 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 #21FD5B in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#21fd5b";💡 Click any tab to see how to use #21fd5b in different programming languages