

Zello users can create channels and give control to other Zello users to become moderators. The app allows to talk one-on-one to a single person or in a channel with a group of people, and offers additional features such as history, replay last message, notifications and Bluetooth device support. It simulates traditional two-way radios, with a walkie-talkie style of communication. Zello is an instant communication app to exchange short audio messages. House of Representatives select committee investigating the 2021 United States Capitol attack demanded records from Zello (alongside 14 other social media companies) going back to the spring of 2020. Once again in September 2018, while Hurricane Florence was causing unprecedented flooding in the Carolinas, rescuers used Zello to request information on street conditions and the locations of people needing help.


The app received over 6 million signups in one week as Florida residents prepared for Hurricane Irma. In August 2017 during relief efforts following Hurricane Harvey in Texas, Zello became a popular method for communications between volunteer rescuers - particularly members of the Cajun Navy - and people stranded by the widespread flooding. In July 2017, in Latvia, Zello was the main application which was used by thousands of volunteers and rescuers for communication purposes while looking for Ivans Berladins who went missing. It "has been one of the most downloaded applications in Ukraine and Venezuela." Zello issued workarounds and patches to overcome the blocks to support approximately 600,000 Venezuelans who have downloaded the application to communicate with each other amidst protests. In February 2014, it was blocked by CANTV in Venezuela. As a result, Zello was the top most downloaded application in Turkey during the first week of June 2013. Zello made the news in June 2013 when Turkish protesters used it to circumvent government censors. Moore founded and was CEO of TuneIn where Gavrilov and his team created popular TuneIn applications. Bill Moore is the CEO and Gavrilov is CTO. Zello acquired the Loudtalks technology, rebranded, moved the development team to Austin, added apps and announced June 20, 2012. Alexey Gavrilov developed the product originally called Loudtalks which was announced at the TechCrunch 40 Mobile and Communications Conference on September 17, 2007.
