Google Now

Probably Siri’s closest competitor, Google offers this free app services to both Android users and iPhone users.  Like all virtual PAs, it responds to your questions, but it also predicts what you need before you know you need it. For example, it’ll let you know about traffic for your morning commute or record your parking location automatically. And, with its ability to communicate directly with many of your apps, it makes your phone an even more powerful and easy-to-use tool.

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