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Olvid vs Session: catalog facts
Olvid	Session
Free The homepage presents Olvid as free messaging for everyone and does not list prices.	Free Free and open source under the GPL 3.0, run by the Session Technology Foundation.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
No phone number, email or personal details needed to use it Never requests access to the address book	No phone number or email needed; the account is a random ID Onion routing hides your address from recipients and from the network
Contacts must also install Olvid to chat with you Pricing and licensing details are not stated on the homepage	Losing your recovery phrase means losing the account with no reset Delivery can be slower than a centralised messenger
Downloadable app	Downloadable app
Closed 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 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.