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Session vs StoneAge Messenger: catalog facts
Session	StoneAge Messenger
Free Free and open source under the GPL 3.0, run by the Session Technology Foundation.	Free Free and open source under GPL-3.0-only.
Windows, macOS, Linux, Android, iOS	Android
No phone number or email needed; the account is a random ID Onion routing hides your address from recipients and from the network	End-to-end encrypted messaging over user-provided storage Supports direct messages and private groups
Losing your recovery phrase means losing the account with no reset Delivery can be slower than a centralised messenger	Requires an S3 bucket or an invite to someone else's No voice or video calls
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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