Before revision: Cell phone alerts Mobile apps As of 2022 , there are three mobile apps licensed to work with ShakeAlert: QuakeAlertUSA, developed by Early Warning Labs, LLC, MyShake, developed by UC Berkeley, and SD Emergency, developed by San Diego County.
After revision: Cell phone alerts Mobile apps As of 2023 , there are two mobile apps licensed to work with ShakeAlert: MyShake, developed by UC Berkeley, and SD Emergency, developed by San Diego County.