smartphone app

You're on vacation. You come across a landmark: the Eiffel Tower, the Empire State Building, the Pyramids of Giza—or the world's largest rubber-band ball. You wonder, how tall is it really? But you didn't get the audio guide. Well, whip out your phone and use the Smart Measure app, and the knowledge will be yours in just a few seconds.

A new study by the San Francisco-based non-profit group Common Sense Media found that affluent parents download apps specifically for their young children more than parents of lesser financial means do. Deemed the “app gap,” researchers found almost half of families with incomes above $75,000 had downloaded such apps, compared with only one in eight families earning less than $30,000. Lower-income

Android users can now download a free app that immediately alerts their family, friends and attorneys when they’re getting arrested. Quadrant 2 developed the I’m Getting Arrested app based on actual events during the Occupy Wall Street movement...