#21DDE0 Hex Color
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#21dde0 is a bright, vivid cyan with a glowing, almost electric finish. The hex code sits high in both saturation and lightness, so it reads fresh and cool instead of calm. It works best as a small accent in tech, entertainment, and children’s branding, and looks richer against deep navy than plain white. Black text on it hits about 12.5:1 contrast, well past WCAG AA.
Questions about #21dde0
What is #21dde0 in RGB, HSL and CMYK?
In RGB, #21dde0 is rgb(33, 221, 224), in HSL hsl(181, 75%, 50%) and in CMYK 85%, 1%, 0%, 12%.
What colors pair well with #21dde0?
Deep navy and charcoal make #21dde0 glow, while warm coral or magenta create punchy contrast. Skip soft pastels, which wash out its brightness.
Is #21dde0 readable on white or black?
#21dde0 has a 1.68:1 contrast ratio on white and 12.48:1 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.