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Best Proton Calendar Alternatives in 2026

12 apps from calendar apps ranked against Proton Calendar on the same published basis.

  1. 1
    EGroupware Free trial Open sourceWebLinuxWinMac €21.90/mo9.2
    Proton Calendar vs EGroupware
  2. 2
    Mozilla Thunderbird Free plan Open sourceAndroidLinuxMacWin Free9.0
    Proton Calendar vs Mozilla Thunderbird
  3. 3
    Microsoft Outlook Calendar Free plan AndroidiOSMacWeb $1.67/mo8.2
    Proton Calendar vs Microsoft Outlook Calendar
  4. 4
    Lark Free plan AndroidapiiOSLinuxMac 8.2
    Proton Calendar vs Lark
  5. 5
    Google Calendar AndroidiOS $7/mo8.1
    Proton Calendar vs Google Calendar
  6. 7
    Teamup Free plan AndroidapiiOSWeb $12/mo8.0
    Proton Calendar vs Teamup
  7. 8
    Calendar.com Free plan AndroidapiextensioniOSWeb $20/mo8.0
    Proton Calendar vs Calendar.com
  8. 9
    Zoho Calendar AndroidiOS 7.9
    Proton Calendar vs Zoho Calendar
  9. 10
    Notion Calendar Free plan AndroidiOS Free7.9
    Proton Calendar vs Notion Calendar
  10. 11
    Nextcloud Calendar AndroidiOS €3.50/mo7.9
    Proton Calendar vs Nextcloud Calendar
  11. 12
    Doodle Free plan Web $11/mo7.8
    Proton Calendar vs Doodle
  12. 13
    Tuta Calendar Free plan AndroidiOS €3/mo7.8
    Proton Calendar vs Tuta Calendar
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