#21ACD3 Hex Color
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With its cool cyan cast and softened saturation, #21acd3 feels refreshing and open without becoming neon. The hex code #21acd3 suits communication tools, children’s products, technology, and aerospace branding where trust and forward motion matter. Use it as a supporting tone or bold interface accent; black text reaches about 7.9:1 contrast for readable small text.
Questions about #21acd3
What is #21acd3 in RGB, HSL and CMYK?
In RGB, #21acd3 is rgb(33, 172, 211), in HSL hsl(193, 73%, 48%) and in CMYK 84%, 18%, 0%, 17%. Browse more shades of blue with names and hex codes.
How should designers use #21acd3 in a palette?
#21acd3 works best as a supporting color or focused accent in interfaces, communication branding, and technology layouts, where its cool brightness can guide attention without taking over the whole composition. Pair it with dark navy or charcoal for stronger structure.
Does #21acd3 read as warm or cool?
#21acd3 reads as a cool cyan because its hue leans blue-green, while its softened saturation keeps the effect clear rather than fluorescent in most digital palettes and common interface settings. The medium lightness adds lift, so it feels more refreshing and active than dense or subdued.
Is #21acd3 readable on white or black?
#21acd3 has a 2.65:1 contrast ratio on white and 7.90:1 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.