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Best Mozilla Thunderbird Alternatives in 2026

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

  1. 1
    Google Calendar AndroidiOS $7/mo9.8
    Mozilla Thunderbird vs Google Calendar
  2. 2
    Microsoft Outlook Calendar Free plan AndroidiOSMacWeb $1.67/mo9.7
    Mozilla Thunderbird vs Microsoft Outlook Calendar
  3. 3
    Proton Calendar Free plan AndroidiOS Free9.6
    Mozilla Thunderbird vs Proton Calendar
  4. 4
    Calendar.com Free plan AndroidapiextensioniOSWeb $20/mo9.6
    Mozilla Thunderbird vs Calendar.com
  5. 5
    Nextcloud Calendar AndroidiOS €3.50/mo9.5
    Mozilla Thunderbird vs Nextcloud Calendar
  6. 6
    Teamup Free plan AndroidapiiOSWeb $12/mo9.5
    Mozilla Thunderbird vs Teamup
  7. 7
    Zoho Calendar AndroidiOS 9.4
    Mozilla Thunderbird vs Zoho Calendar
  8. 8
    Notion Calendar Free plan AndroidiOS Free9.4
    Mozilla Thunderbird vs Notion Calendar
  9. 9
    Lark Free plan AndroidapiiOSLinuxMac 9.4
    Mozilla Thunderbird vs Lark
  10. 10
    Tuta Calendar Free plan AndroidiOS €3/mo9.3
    Mozilla Thunderbird vs Tuta Calendar
  11. 11
    Cozi Free plan AndroidiOS $3.25/mo9.3
    Mozilla Thunderbird vs Cozi
  12. 12
    Fantastical Free plan iOS Free9.3
    Mozilla Thunderbird vs Fantastical
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