The app saw a surge in users this week with nearly 2 million downloads from Los Angeles area residents, nearly doubling its user base.

This week, as wildfires erupted across Los Angeles, residents anxious for real-time information about the rapidly-shifting perimeters of the fires passed around a tip: download Watch Duty.

Watch Duty has added 750,000 users in the last 12 hours, as L.A. residents rely on it for real-time information to track the wildfires around them. Early on Wednesday morning, as the Eaton fire quickly grew northeast of Los Angeles,