Compare software

Sterna MailK-9 Mail
Free

Free and open source under the GPL-3.0-or-later licence, with no ads.

 Free

Free and open source.

Android Android
  • Native JMAP support as well as IMAP/SMTP
  • No tracking, ads or Google services
  • Open source with a long track record on Android
  • Now the foundation for Thunderbird's official mobile app
  • Android only
  • Young project still changing its interface often
  • Android only, no iOS version
  • Interface is more utilitarian than modern polished mail apps
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0-or-later License: Apache-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

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