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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/mo9.3
    Mozilla Thunderbird vs Calendar.com
  2. 2
    Teamup Free plan AndroidapiiOSWeb $12/mo9.2
    Mozilla Thunderbird vs Teamup
  3. 3
    Microsoft Outlook Calendar AndroidiOSMacWeb $1.67/mo9.0
    Mozilla Thunderbird vs Microsoft Outlook Calendar
  4. 4
    Reclaim AI Free plan extensionWeb $0.83/mo9.0
    Mozilla Thunderbird vs Reclaim AI
  5. 5
    FlowSavvy Free plan AndroidiOSWeb 9.0
    Mozilla Thunderbird vs FlowSavvy
  6. 6
    EGroupware Free trial Open sourceWebLinuxWinMac €21.90/mo9.0
    Mozilla Thunderbird vs EGroupware
  7. 7
    Google Calendar AndroidiOS $7/mo8.8
    Mozilla Thunderbird vs Google Calendar
  8. 8
    Lark Free plan AndroidapiiOSLinuxMac 8.8
    Mozilla Thunderbird vs Lark
  9. 9
    Fantastical Free plan iOS Free8.8
    Mozilla Thunderbird vs Fantastical
  10. 10
    CalendarBridge AI Scheduling Assistant Free trial AndroidiOSWeb $4/mo8.7
    Mozilla Thunderbird vs CalendarBridge AI Scheduling Assistant
  11. 11
    Proton Calendar Free plan AndroidiOS Free8.6
    Mozilla Thunderbird vs Proton Calendar
  12. 12
    Informant Free plan AndroidiOS 8.5
    Mozilla Thunderbird vs Informant
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