Apple’s iOS-based iPad still rules the tablet market but not for want of trying by competitors like Google, Research in Motion, Motorola, Samsung, and, once-upon-a-time, Hewlett-Packard. But figuring out just how broad Apple’s lead in the market is can be difficult.
Apple itself is up front about its iPad and iPad 2 sales figures—for example, the company says it sold 9.25 million iPads in its fiscal third quarter, according to its most recent earnings report. It’s not nearly as easy to put a number on the amount of non-iOS tablets that have been sold in that or any other quarter.
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