Zello is an application for push-to-talk (PTT) walkie-talkie for consumers and business and available for Android, iOS, Blackberry, Windows Phone, Windows PC, rugged mobile devices and two-way radios. Developed by Zello Inc.
License: Free Personal
Zello is primarily focused on real-time voice communication, making it ideal for walkie-talkie style interactions, while Google Allo was designed for enriched messaging experiences with smart features and media sharing but has been discontinued. This makes Zello more suitable for users needing instant communication, whereas Google Allo provided advanced messaging capabilities before its shutdown.