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FairEmailThunderbird
Free

Free to download from Google Play, F-Droid or GitHub releases.

 Free

Free forever, funded by donations.

Android Windows, macOS, Linux, Android
  • Works with nearly all IMAP providers and unlimited accounts
  • OpenPGP and S/MIME encryption built in
  • Unified inbox across every account, or each account kept separate, your choice
  • Mail, calendar, contacts and tasks in one application rather than four
  • No Microsoft Exchange Web Services or ActiveSync support
  • Android only
  • The interface carries a lot of history and can feel dense next to a webmail tab
  • Major ESR releases have historically been disruptive for add-ons and settings
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0 License: MPL-2.0
Not stated if an account is needed No account needed
Works offline Works offline

Checked September 23, 2026

Checked September 20, 2026

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