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Sideband vs Berty: catalog facts
Sideband	Berty
Free The open-source application is available without a license fee.	Free Free and open source, developed by a non-profit.
macOS, Linux, Android	Android, iOS
Messages travel over radio links with no internet or cellular service Store-and-forward delivery, so both parties need not be online at once	No central server; messages travel peer to peer Designed to work offline or on restricted networks
Requires a Reticulum network, and usually radio hardware, to be useful Small project with a niche user base	Developers say it is not yet ready for high-risk use Small team and a smaller user base than mainstream messengers
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.