Apple refreshes Macs and iOS, unveils iTunes Radio

 San Francisco (CNN) -- Calling it "the biggest change to iOS since the introduction of the iPhone," Apple CEO Tim Cook on Monday unveiled an operating system for iPhones and iPads that will radically overhaul how users' touchscreens look.

The new system, iOS 7, was part of a two-hour presentation that included refreshed MacBook Airs, the announcement of an iTunes Radio streaming-music service and a sneak peek at a new Mac Pro that will be the most powerful computer Apple has ever made.

The keynote, kicking off Apple's annual Worldwide Developer's Conference, marked Apple's first major product event in nine months. But it was short on blockbuster launches or surprises -- no TV, no smartwatch and no upgrades to marquee products like the iPhone and iPad.

Some pundits griped about a lack of groundbreaking hardware or features at a time when Apple is facing a stock-price slump, increasing competition from rivals like Samsung and a gnawing perception that the giant computer company is not as bold or as cool as it was under Steve Jobs, its late CEO and co-founder.

Instead, developers assembled for the weeklong conference got the first look at a major reworking of Apple's mobile operating system, due this fall. iOS is home to more than 900,000 apps that collectively have earned independent developers $10 billion, according to Apple.

The mobile design, overseen for the first time by new iOS boss Jony Ive, includes new typography, redesigned icons and a new color palette.

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