Apple Inc CEO Tim Cook speaks about the new iPad Air and the iPad mini with Retnia display during an Apple event in San Francisco, California October 22, 2013. [Photo/Agencies]

Apple Inc. is refreshing its iPad lineup and slashing the price of its Mac computers ahead of the holiday shopping season, as it faces an eroding tablet market share and growing competition from rival gadget makers.

Apple unveiled a new, thinner, lighter tablet called the "iPad Air" along with a slew of new Macs Tuesday at an event in San Francisco. The iPad Air weighs just 1 pound, compared with 1.4 pounds for the previous version. Apple marketing chief Phil Schiller called the tablet a "screaming fast iPad." He said it is eight times faster than the original iPad that came out in 2010.

The iPad Air will go on sale Nov. 1 and start at $499 for a model with 16 gigabytes of memory. Apple plans to phase out its third and fourth generation iPads while the iPad 2, which launched in 2011, continues selling at $399. A new iPad Mini, meanwhile, will be available later in November starting at $399 for a 16-gigabyte model. It has a retina display designed to give it a clearer, sharper picture and the same 64-bit chip that powers the iPad Air.

The iPad's market share has been eroding compared with cheaper rivals running Google Inc.'s Android operating system. Research firm Gartner Inc. estimates that Android tablets will end 2013 with a 50 percent share of the worldwide market versus 49 percent for the iPad. Just two years ago, the iPad commanded a 65 percent market share compared to 30 percent for Android tablets.

Apple sold 14.6 million iPads in the June quarter, down 14 percent from the same time last year. It was the first year-over-year decline in iPad sales. Nonetheless, Apple CEO Tim Cook touted that Apple has sold 170 million iPads since the tablets launched three years ago.