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

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