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MailMateThunderbird
Freemium

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

 Free

Free forever, funded by donations.

macOS Windows, macOS, Linux, Android
  • Extensive keyboard control
  • Markdown email composition
  • Unified inbox across every account, or each account kept separate, your choice
  • Mail, calendar, contacts and tasks in one application rather than four
  • macOS only
  • Current 2.0 version is still a beta
  • 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
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.