Compare software

InboxPagerK-9 Mail
Free

Free and open source under GPL-3.0.

 Free

Free and open source.

Android Android
  • Supports IMAP, POP and SMTP over SSL/TLS
  • Handles attachments and unread-message tracking
  • Open source with a long track record on Android
  • Now the foundation for Thunderbird's official mobile app
  • Requires an email server that supports SSL/TLS.
  • 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-only 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 8, 2026

Checked September 22, 2026

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