Sorry, Siri. You've Got Some Serious Competition

Screengrab via Tempo
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Another smart calendar keeper, Tempo has a seemingly endless number of abilities.

This app can send a pre-populated "running late" email or text and pull up relevant information--e-mails, documents, LinkedIn profiles--that pertain to a particular meeting or a call. It gets directions, estimates driving time, keeps track of flights, finds meeting locations, and connects to Foursquare and Yelp.

And best of all? Tempo simplifies dialing into conference calls by handling the passcode.