Everything You Need To Know About AI Assistants, From Siri To Ozlo

An army of nonhuman helpers are here—or on their way—to make life easier. Here's how they compare.

In the latest attempt to fulfill sci-fi movie fantasies, tech firms have been lining up to provide you with a virtual assistant. From well-known voice-powered AIs such as Apple's Siri to upstarts like Viv, the goal is to quicken the actions you already take on your phone and other devices, growing ever-more efficient at the job by learning from your behavior.

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