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StoneAge MessengerDelta Chat
Free

Free and open source under GPL-3.0-only.

 Free

Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…

Android Windows, macOS, Linux, Android, iOS
  • End-to-end encrypted messaging over user-provided storage
  • Supports direct messages and private groups
  • Works with any email account, or with a provided chatmail relay
  • Reaches people who do not use Delta Chat at all
  • Requires an S3 bucket or an invite to someone else's
  • No voice or video calls
  • 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-only License: GPL-3.0
No account needed No account needed
Needs internet Works offline

Checked October 8, 2026

Checked September 21, 2026

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