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Berty vs Session: catalog facts
Berty	Session
Free Free and open source, developed by a non-profit.	Free Free and open source under the GPL 3.0, run by the Session Technology Foundation.
Android, iOS	Windows, macOS, Linux, Android, iOS
No central server; messages travel peer to peer Designed to work offline or on restricted networks	No phone number or email needed; the account is a random ID Onion routing hides your address from recipients and from the network
Developers say it is not yet ready for high-risk use Small team and a smaller user base than mainstream messengers	Losing your recovery phrase means losing the account with no reset Delivery can be slower than a centralised messenger
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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