Analyst firm Gartner has reported that tablet sales growth is slowing and that, while Android is doing well in overall device sales, the same cannot be said for iOS and Windows.
Android sales across all three hardware categories - PCs, tablets and mobile phones - in mature markets are expected to be 314 million in 2014, and 338 million in 2015. Sales in 2013 were 267 million.
Apple's growth over the same period is less impressive. Sales of iOS were 157 million in 2013, and an anticipated 168 million in 2014 and 183 million in 2015.
Microsoft is set to shift 149 million Windows devices next year, compared to 142 million this year and 138 million in 2013.
Overall tablet sales are expected to reach 229 million units this year, around 10 percent more than last year. In 2013 the market increased by over 55 percent on the previous year.
Gartner explained that tablet users have traditionally updated with like-for-like hardware, but that many are now choosing to take on a hybrid alternative.
Overall device shipments, including smartphones, PCs, hybrids, tablets and clamshells, will hit 2.4 billion this year, according to the analyst.
"The device market continues to evolve, with the relationship between traditional PCs, different form-factor ultramobiles (clamshells, hybrids and tablets) and mobile phones becoming increasingly complex," said Ranjit Atwal, research director at Gartner.
"Some tablet users are not replacing a tablet with a tablet, they are favouring hybrid or two-in-one devices, increasing the share of the ultramobile premium market to 22 percent in 2014, and 32 percent by 2018."
Smartphone shipments are likely to increase, and Gartner said that Chinese hardware providers, many of which will offer the Google Android OS on their handsets, saw gains this year.
Sales of 'basic' smartphone handsets and sales in emerging markets are also rising. Gartner said that these devices will dominate by 2018, and it is likely that Android will remain the dominant force.
"The market is clearly favouring those vendors offering value in lower-priced smartphones," said Roberta Cozza, research director at Gartner.
"This trend has become more apparent, especially in the second quarter of 2014 when most of the top Chinese smartphone vendors grew volume and market share. As smartphones reach lower prices, Gartner expects nine out of 10 phones to be smartphones by 2018."
While premium ultramobiles are taking sales from tablets, they are not close to their rivals in numbers. Tablet shipments for 2014 are predicted at 229 million. Ultramobiles weigh in at 37 million and traditional desktop PCs and notebooks add up to 277 million.
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