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Best Outlook Google Calendar Sync Alternatives in 2026

Updated

20 apps from calendar apps ranked against Outlook Google Calendar Sync on the same published basis.

  1. 1
    Mozilla Thunderbird Free plan Open sourceAndroidLinuxMacWin Free9.0
    Outlook Google Calendar Sync vs Mozilla Thunderbird
  2. 2
    Microsoft Outlook Calendar Free plan AndroidiOSMacWeb $1.67/mo8.2
    Outlook Google Calendar Sync vs Microsoft Outlook Calendar
  3. 3
    Lark Free plan AndroidapiiOSLinuxMac 8.2
    Outlook Google Calendar Sync vs Lark
  4. 4
    EGroupware Free trial Open sourceWebLinuxWinMac €21.90/mo8.2
    Outlook Google Calendar Sync vs EGroupware
  5. 5
    Proton Calendar Free plan AndroidiOS Free8.0
    Outlook Google Calendar Sync vs Proton Calendar
  6. 6
    Teamup Free plan AndroidapiiOSWeb $12/mo8.0
    Outlook Google Calendar Sync vs Teamup
  7. 7
    Cozi Free plan AndroidiOSWeb $3.25/mo8.0
    Outlook Google Calendar Sync vs Cozi
  8. 8
    Calendar.com Free plan AndroidapiextensioniOSWeb $20/mo8.0
    Outlook Google Calendar Sync vs Calendar.com
  9. 9
    TimeFinder Free plan AndroidiOSMacWebWin Free8.0
    Outlook Google Calendar Sync vs TimeFinder
  10. 10
    Notion Calendar Free plan AndroidiOS Free7.9
    Outlook Google Calendar Sync vs Notion Calendar
  11. 11
    TimeTree Free plan AndroidiOSWeb $3.75/mo7.9
    Outlook Google Calendar Sync vs TimeTree
  12. 12
    Fantastical Free plan iOSMacWin Free7.9
    Outlook Google Calendar Sync vs Fantastical
  13. 13
    Doodle Free plan Web $11/mo7.8
    Outlook Google Calendar Sync vs Doodle
  14. 14
    Tuta Calendar Free plan AndroidiOSLinuxMacWeb €3/mo7.8
    Outlook Google Calendar Sync vs Tuta Calendar
  15. 15
    Reclaim AI Free plan extensionWeb $10/mo7.8
    Outlook Google Calendar Sync vs Reclaim AI
  16. 16
    FlowSavvy Free plan AndroidiOSWeb 7.8
    Outlook Google Calendar Sync vs FlowSavvy
  17. 17
    Musubi Free plan AndroidiOSself-hostedWeb Free7.8
    Outlook Google Calendar Sync vs Musubi
  18. 18
    Samsung Calendar Free plan Android Free7.7
    Outlook Google Calendar Sync vs Samsung Calendar
  19. 19
    Trevor AI Free plan Web $0.42/mo7.7
    Outlook Google Calendar Sync vs Trevor AI
  20. 20
    Calendars by Readdle Free plan iOSMac $1.67/mo7.7
    Outlook Google Calendar Sync vs Calendars by Readdle

Outlook Google Calendar Sync alternatives compared

#AppScoreFree planFromRuns on
1Mozilla Thunderbird9.0Free planFreeAndroid, Linux, Mac, Windows
2Microsoft Outlook Calendar8.2Free plan$1.67/moAndroid, iOS, Mac, Web
3Lark8.2Free planAndroid, API, iOS, Linux, Mac, Web, Windows
4EGroupware8.2€21.90/moWeb, Linux, Windows, Mac
5Proton Calendar8.0Free planFreeAndroid, iOS
6Teamup8.0Free plan$12/moAndroid, API, iOS, Web
7Cozi8.0Free plan$3.25/moAndroid, iOS, Web
8Calendar.com8.0Free plan$20/moAndroid, API, Browser, iOS, Web
9TimeFinder8.0Free planFreeAndroid, iOS, Mac, Web, Windows
10Notion Calendar7.9Free planFreeAndroid, iOS
11TimeTree7.9Free plan$3.75/moAndroid, iOS, Web
12Fantastical7.9Free planFreeiOS, Mac, Windows
13Doodle7.8Free plan$11/moWeb
14Tuta Calendar7.8Free plan€3/moAndroid, iOS, Linux, Mac, Web, Windows
15Reclaim AI7.8Free plan$10/moBrowser, Web
16FlowSavvy7.8Free planAndroid, iOS, Web
17Musubi7.8Free planFreeAndroid, iOS, self-hosted, Web
18Samsung Calendar7.7Free planFreeAndroid
19Trevor AI7.7Free plan$0.42/moWeb
20Calendars by Readdle7.7Free plan$1.67/moiOS, Mac
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Questions about Outlook Google Calendar Sync alternatives

What is the best alternative to Outlook Google Calendar Sync?

Mozilla Thunderbird, number 1 in calendar apps with a score of 9.0 out of 10. The others here: Microsoft Outlook Calendar, Lark, EGroupware and 16 more.

What is the best free alternative to Outlook Google Calendar Sync?

Mozilla Thunderbird is the best-ranked alternative with a free plan. 19 of the 20 alternatives here publish a free plan on their own pricing pages.

Is there an open-source alternative to Outlook Google Calendar Sync?

Yes: Mozilla Thunderbird, EGroupware.

How are these alternatives ranked?

Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.