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Delta Chat vs ArcaneChat: catalog facts
Delta Chat	ArcaneChat
Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…	Free Free and open source, with no ads, funded by donations.
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	No phone number needed to sign up End-to-end encryption and consent-based contact
Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers	Android only; other platforms must use Delta Chat Maintained mainly by one developer
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 October 2, 2026

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