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Conversations vs Delta Chat: catalog facts
Conversations	Delta Chat
Freemium Free and open source. The Google Play build is a paid way to support development.	Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…
Android	Windows, macOS, Linux, Android, iOS
Federated protocol, so you choose or run the server OMEMO encryption with a mature, well-reviewed implementation	Works with any email account, or with a provided chatmail relay Reaches people who do not use Delta Chat at all
Feature availability depends on what the chosen server supports Paid on Google Play, though free builds exist on F-Droid	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
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.