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Delta Chat vs StoneAge Messenger: catalog facts
Delta Chat	StoneAge Messenger
Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…	Free Free and open source under GPL-3.0-only.
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	End-to-end encrypted messaging over user-provided storage Supports direct messages and private groups
Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers	Requires an S3 bucket or an invite to someone else's No voice or video calls
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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