Sentrycs is a security software company that offers integrated anti-drone solutions. It provides its solutions for airports, borders, prisons, critical infrastructures, and mass events. The company caters its services to law enforcement agencies, defense, and special forces. It was formerly known as Convexum and changed its name to Sentrycs in April 2023. The company was founded in 2015 and is based in Tel Aviv, Israel. In August 2022, Sentrycs was acquired by Berkeley Research Group.

These messages are dispatched via email, activated when the user is marked as deceased. The procedure encompasses two notification choices: the Friend's Check and the Self Check.

The Friend's Check requires sharing a confidential code with a trusted person who can confirm the user's passing, thus initiating the delivery of the posthumous messages. On the other hand, the Self Check allows users to set periodic check-ins, and if there is no response within the specified time, the messages are automatically sent.

Crafting posthumous messages on GoodByeMemo is a straightforward and intimate process. Users can employ their smartphones to compose messages, include photos, attach files, and even record videos, rendering each message distinct and profoundly meaningful.