Sky Blue #87CEEB

A clear sky is blue because air scatters short blue wavelengths of sunlight more than longer red ones. The color named after it carries the obvious associations: good weather, open space, a free afternoon.

Sky blue suggests freedom and optimism more than authority. It is gentler than royal blue and less serious than navy, so it rarely feels corporate. Airlines, weather apps, and travel brands use it because it says 'outside' without any words. It also feels honest and uncomplicated, which helps family and outdoor brands.

Some national identities lean on it. Argentina's flag and the shirts of its national football team are a light sky blue, often called celeste in Spanish. In many places it is also tied to baby boys, though that convention varies by country and generation.

Sky blue makes a friendly background for kids' apps, onboarding screens, and summer promotions. It needs dark text: navy or charcoal reads clearly, and white text on it is too faint for anything but huge display type.

Pair it with a deeper blue for buttons so the interface still has a clear hierarchy. In interiors, it suits nurseries, porch ceilings, and bathrooms, and in fashion it is a reliable spring and summer shirt color that works with tan, white, or navy.