Life360′s Family Safety App Embraces The Check-In, Then Surges

For the last two and a half years we've been tracking the progress of Life360 , a startup that looks to help you keep your family safer by offering a variety of tools, like protection against identify theft and an alert system to monitor for sex offenders in your neighborhood. It's not the sort of thing you'd expect to go viral. Except that's what just happened. Recently, Life360 has been adding over 10,000 families per day — it just set a new record last week, with 72,000 family signups. In total, it is approaching 1 million registered families, 363,000 of whom were active last month. And these are families we're talking about — the absolute number of downloads is higher. So what's driving the growth?