#638A8E Hex Color
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Reach for #638a8e when you need a muted cyan that behaves like a supporting tone, not a hero. Its ashy, low saturation suits app backgrounds, dashboards, and tech branding where a plain sky blue would feel too loud. Black text passes WCAG AA on it at about 5.6:1 contrast. Pair it with warm terracotta or soft cream to lift the dusty gray undertone.
Questions about #638a8e
What is #638a8e in RGB, HSL and CMYK?
In RGB, #638a8e is rgb(99, 138, 142), in HSL hsl(186, 18%, 47%) and in CMYK 30%, 3%, 0%, 44%.
What colors pair well with #638a8e?
Warm accents like terracotta, coral, and soft cream balance the cool gray undertone of #638a8e. For a calmer palette, try deeper slate blues or muted sage greens alongside it.
Does #638a8e read warm or cool?
It reads cool, but only slightly. The heavy gray desaturation softens the cyan base, so it sits closer to neutral than a true sky blue and works with both warm and cool accents.
Is #638a8e readable on white or black?
#638a8e has a 3.77:1 contrast ratio on white and 5.55:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it works only for large text (24px, or 18.5px bold) and on black it works for body text. Try other pairs in the contrast checker.