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

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