San Francisco-based Life360 has announced that its family safety app is now being used by over 2 million families, 1 million of whom started using the service in the last 10 weeks. The app is growing by 100,000 to 120,000 users each week.

Life360’s iPhone and Android applications enables families to use their mobile phone as a safety device by offering check-in and panic capabilities, so parents can non-intrusively maintain communication with their kids. The app also shows registered sex offenders on the map.

The Android and iPhone apps are free, and the company is making money by selling a monthly subscription ($4.99) to locate non iPhone and Android phones, as well as a dedicated GPS tracker ($99 plus $9.99 monthly subscription).

The company won Google’s Android Developer challenge in 2008 and raised millions of dollars from Google, the Facebook Fund, Dave McClure’s 500 Startups, Founders Fund, LaunchCapital, Kapor Capital and others.

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