Frank N. Magid Associates reports that iPad ownership has decreased among smartphone owners from 72 percent last year to 50 percent now. The Amazon Kindle Fire has made up that marketshare difference, increasing from a market share of zero to 22 percent.

“We expect to see the iPad as the leader, but with the Surface, Kindle Fire, and Nexus as three solid competitors with significant market share,” said Magid executive director of mobile strategy Tom Godfrey. “What is interesting now is that many people, including a lot of publishers, think the tablet market is just the iPad, but these figures show people need to consider other platforms as well.”

Magid expects the number of tablet owners to soon double from 51 million to 106 million users.