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Session vs Delta Chat: catalog facts
Session	Delta Chat
Free Free and open source under the GPL 3.0, run by the Session Technology Foundation.	Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, 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	Works with any email account, or with a provided chatmail relay Reaches people who do not use Delta Chat at all
Losing your recovery phrase means losing the account with no reset Delivery can be slower than a centralised messenger	Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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