Build subscriber lists to create an effective emergency mass notification program. Any opt-in message sent will automatically notify potential AlertU subscribers to confirm their registration.

There are several ways to collect subscribers:

- mobile opt-in (subscriber texts in)
- web widget (subscribes from web page)
- AlertU webpage (exposed filters)
- bulk upload of numbers

Advanced data collection features provide subscriber information that can be categorized and quickly accessed in case of an emergency.

In addition to the standard way of building a subscriber base, AlertU also provides each client with specific marketing materials designed to increase subscription rates.