Google today introduced Duo, a "one-to-one video messaging app" that looks a lot like Apple's FaceTime.

It's not yet available, but Google promises it's coming soon for both Android and iPhone.Select a contact or phone number, call them, and start a video conversation.

It's simple.Google is positioning its expertise at web video calling, drawn from Google Hangouts and the Chrome browser, as something that sets Duo apart.

But unlike Apple FaceTime, Duo works across both Google Android and Apple iPhone and iPad.

That gives it a much broader potential customer base — and a wider range of people you can call.

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