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Delta Chat vs Conversations: catalog facts
Delta Chat	Conversations
Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…	Freemium Free and open source. The Google Play build is a paid way to support development.
Windows, macOS, Linux, Android, iOS	Android
Works with any email account, or with a provided chatmail relay Reaches people who do not use Delta Chat at all	Federated protocol, so you choose or run the server OMEMO encryption with a mature, well-reviewed implementation
Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers	Feature availability depends on what the chosen server supports Paid on Google Play, though free builds exist on F-Droid
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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