Compare software

K-9 MailInboxPager
Free

Free and open source.

 Free

Free and open source under GPL-3.0.

Android Android
  • Open source with a long track record on Android
  • Now the foundation for Thunderbird's official mobile app
  • Supports IMAP, POP and SMTP over SSL/TLS
  • Handles attachments and unread-message tracking
  • Android only, no iOS version
  • Interface is more utilitarian than modern polished mail apps
  • Requires an email server that supports SSL/TLS.
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-3.0-only
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 September 22, 2026

Checked October 8, 2026

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