QuakeAlertUSA is a utility app designed for iPhone users, providing real-time earthquake alerts. This application sends push notifications detailing the expected shaking intensity and the time until shaking occurs, allowing users to prepare accordingly. The alerts come with crucial safety instructions to drop, cover, and hold on, enhancing user readiness during seismic events.

The app's warning times vary based on the earthquake's characteristics, ranging from 10 to over 60 seconds. Additionally, it features a Bypass Do Not Disturb option, ensuring alerts sound even when the phone is silent. Utilizing data from the USGS and ShakeAlert, the QuakeAlertUSA app is an official pilot program focused on user safety in California, though it is currently in a beta phase without guarantees.