#00FFF9 Hex Color
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This piercing neon cyan is electric and impossible to ignore. Because it is so vivid, the hex code #00fff9 works best as a sharp accent rather than a full background. It pops against dark, charcoal grays or deep navies, giving UI elements a futuristic, high-energy feel. Black text is highly legible over this color, making it a reliable choice for buttons or notification highlights.
Questions about #00fff9
What is #00fff9 in RGB, HSL and CMYK?
In RGB, #00fff9 is rgb(0, 255, 249), in HSL hsl(179, 100%, 50%) and in CMYK 100%, 0%, 2%, 0%.
How can I effectively use #00fff9 in a UI design?
#00fff9 works best as a surgical accent color rather than a background because of its extreme vibrancy. Use it to highlight call-to-action buttons or notification badges against dark mode interfaces where it offers the highest legibility and visual impact.
Is #00fff9 readable on white or black?
#00fff9 has a 1.25:1 contrast ratio on white and 16.67:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it is too faint for text and on black it works for body text. Try other pairs in the contrast checker.