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ThunderbirdBlueMail
Free

Free forever, funded by donations.

 Freemium

The client is free to download. Some features are reserved for paid plans.

Windows, macOS, Linux, Android Windows, macOS, Linux, iOS
  • Unified inbox across every account, or each account kept separate, your choice
  • Mail, calendar, contacts and tasks in one application rather than four
  • One inbox covers many accounts across Windows, macOS, Linux, Android and iOS with a consistent interface and shared…
  • 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
  • It is closed source, some features need a paid plan, and its handling of account credentials has drawn…
Downloadable app Downloadable app
Open source Closed source
License: MPL-2.0 License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 20, 2026

Checked September 22, 2026

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