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Best Mozilla Thunderbird Alternatives in 2026

12 platforms from calendar apps ranked against Mozilla Thunderbird on the same published basis.

  1. 1
    Calendar.com Free plan AndroidapiextensioniOSWeb $20/mo8.8
    Mozilla Thunderbird vs Calendar.com
  2. 2
    Teamup Free plan AndroidapiiOSWeb $12/mo8.7
    Mozilla Thunderbird vs Teamup
  3. 3
    7shifts Free plan AndroidapiiOSWeb Free8.1
    Mozilla Thunderbird vs 7shifts
  4. 4
    EGroupware Free trial Open sourceWebLinuxWinMac €21.90/mo7.8
    Mozilla Thunderbird vs EGroupware
  5. 5
    Google Calendar AndroidiOS $7/mo7.6
    Mozilla Thunderbird vs Google Calendar
  6. 7
    Microsoft Outlook Calendar Free plan AndroidiOSMacWeb $1.67/mo7.5
    Mozilla Thunderbird vs Microsoft Outlook Calendar
  7. 8
    Proton Calendar Free plan AndroidiOS Free7.4
    Mozilla Thunderbird vs Proton Calendar
  8. 9
    Reclaim AI Free plan extensionWeb $0.83/mo7.4
    Mozilla Thunderbird vs Reclaim AI
  9. 10
    Notion Calendar Free plan AndroidiOS Free7.3
    Mozilla Thunderbird vs Notion Calendar
  10. 11
    Nextcloud Calendar AndroidiOS €3.50/mo7.3
    Mozilla Thunderbird vs Nextcloud Calendar
  11. 12
    Doodle Free plan Web $11/mo7.3
    Mozilla Thunderbird vs Doodle
  12. 13
    MagicINFO Cloud api 7.3
    Mozilla Thunderbird vs MagicINFO Cloud
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