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MailMateBetterbird
Freemium

Uses a license key model, and the developer describes a Free Mode.

 Free

Free and open source, funded by donations.

macOS Windows, macOS, Linux
  • Extensive keyboard control
  • Markdown email composition
  • Fixes and features Thunderbird has not shipped, listed openly in a comparison table
  • Installs next to Thunderbird and runs on the same profile, so switching back is trivial
  • macOS only
  • Current 2.0 version is still a beta
  • A small volunteer project riding on someone else’s release train
  • The Mac build ships in English only and needs a language pack for anything else
Downloadable app Downloadable app
Closed source Open source
License not stated License: MPL-2.0
No account needed No account needed
Not stated if it 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.