While these magazine apps are often free on the iPad and iPhone, purchasing the actual issues costs extra.

尽管在iPad和iPhone上这些电子杂志通常是免费的，购买真实期刊才额外收费。

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You can even read both books (thanks to free apps from Amazon) on your iPad, iPhone, Android, Mac or PC.

FORBES: The Risky Business School of Leadership

All Kindle books are "Buy Once, Read Everywhere"-customers can read their Kindle books on Kindle devices and on iPhone, iPad, iPod touch, Android and Windows phones and Android tablets using the free Kindle apps.

ENGADGET: Amazon's new Kindles now available in Canada, Paperwhite starting at CAD $139