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Cwtch vs Session: catalog facts
Cwtch	Session
Free The open-source application is available without a license fee.	Free Free and open source under the GPL 3.0, run by the Session Technology Foundation.
Windows, macOS, Linux, Android	Windows, macOS, Linux, Android, iOS
Designed specifically to resist metadata collection, not just message reading No account, phone number or email required	No phone number or email needed; the account is a random ID Onion routing hides your address from recipients and from the network
Tor routing makes delivery slow and requires both parties online Small project with a limited feature set	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
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 21, 2026

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