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Best Clustra Calendar Alternatives in 2026

Updated

20 tools from calendar apps ranked against Clustra Calendar on the same published basis.

  1. 1
    Lark Free plan AndroidapiiOSLinuxMac 9.2
    Clustra Calendar vs Lark
  2. 2
    Calendar.com Free plan AndroidapiextensioniOSWeb $20/mo9.1
    Clustra Calendar vs Calendar.com
  3. 3
    Microsoft Outlook Calendar Free plan AndroidiOSMacWeb $1.67/mo9.0
    Clustra Calendar vs Microsoft Outlook Calendar
  4. 4
    Teamup Free plan AndroidapiiOSWeb $12/mo8.9
    Clustra Calendar vs Teamup
  5. 5
    Cozi Free plan AndroidiOSWeb $3.25/mo8.9
    Clustra Calendar vs Cozi
  6. 6
    TimeTree Free plan AndroidiOSWeb $3.75/mo8.9
    Clustra Calendar vs TimeTree
  7. 7
    FlowSavvy Free plan AndroidiOSWeb 8.7
    Clustra Calendar vs FlowSavvy
  8. 8
    Proton Calendar Free plan AndroidiOS Free8.6
    Clustra Calendar vs Proton Calendar
  9. 9
    Reclaim AI Free plan extensionWeb $10/mo8.6
    Clustra Calendar vs Reclaim AI
  10. 10
    Trevor AI Free plan Web $0.42/mo8.4
    Clustra Calendar vs Trevor AI
  11. 11
    TimeFinder Free plan AndroidiOSMacWebWin Free8.4
    Clustra Calendar vs TimeFinder
  12. 12
    EGroupware Free trial Open sourceWebLinuxWinMac €21.90/mo8.4
    Clustra Calendar vs EGroupware
  13. 13
    FamilyWall Free plan AndroidiOSWeb $3.75/mo8.4
    Clustra Calendar vs FamilyWall
  14. 14
    Google Calendar AndroidiOS $7/mo8.3
    Clustra Calendar vs Google Calendar
  15. 15
    Fantastical Free plan iOS Free8.3
    Clustra Calendar vs Fantastical
  16. 16
    Rise Calendar Free plan AndroidiOSMacWin €10/mo8.3
    Clustra Calendar vs Rise Calendar
  17. 17
    Notion Calendar Free plan AndroidiOS Free8.2
    Clustra Calendar vs Notion Calendar
  18. 18
    Mozilla Thunderbird Free plan Open sourceAndroidLinuxMacWin Free8.2
    Clustra Calendar vs Mozilla Thunderbird
  19. 19
    Ellie Planner Free plan iOSMacWebWin $9.99/mo8.2
    Clustra Calendar vs Ellie Planner
  20. 20
    Sorted³ Free plan iOSMac $14.99/mo8.2
    Clustra Calendar vs Sorted³

Clustra Calendar alternatives compared

#ToolScoreFree planFromRuns on
1Lark9.2Free plan—Android, API, iOS, Linux, Mac, Web, Windows
2Calendar.com9.1Free plan$20/moAndroid, API, Browser, iOS, Web
3Microsoft Outlook Calendar9.0Free plan$1.67/moAndroid, iOS, Mac, Web
4Teamup8.9Free plan$12/moAndroid, API, iOS, Web
5Cozi8.9Free plan$3.25/moAndroid, iOS, Web
6TimeTree8.9Free plan$3.75/moAndroid, iOS, Web
7FlowSavvy8.7Free plan—Android, iOS, Web
8Proton Calendar8.6Free planFreeAndroid, iOS
9Reclaim AI8.6Free plan$10/moBrowser, Web
10Trevor AI8.4Free plan$0.42/moWeb
11TimeFinder8.4Free planFreeAndroid, iOS, Mac, Web, Windows
12EGroupware8.4No€21.90/moWeb, Linux, Windows, Mac
13FamilyWall8.4Free plan$3.75/moAndroid, iOS, Web
14Google Calendar8.3No$7/moAndroid, iOS
15Fantastical8.3Free planFreeiOS
16Rise Calendar8.3Free plan€10/moAndroid, iOS, Mac, Windows
17Notion Calendar8.2Free planFreeAndroid, iOS
18Mozilla Thunderbird8.2Free planFreeAndroid, Linux, Mac, Windows
19Ellie Planner8.2Free plan$9.99/moiOS, Mac, Web, Windows
20Sorted³8.2Free plan$14.99/moiOS, Mac
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Questions about Clustra Calendar alternatives

What is the best alternative to Clustra Calendar?

Lark, number 1 in calendar apps with a score of 9.2 out of 10. The others here: Calendar.com, Microsoft Outlook Calendar, Teamup and 16 more.

What is the best free alternative to Clustra Calendar?

Lark is the best-ranked alternative with a free plan. 18 of the 20 alternatives here publish a free plan on their own pricing pages.

Is there an open-source alternative to Clustra Calendar?

Yes: EGroupware, Mozilla Thunderbird.

How are these alternatives ranked?

Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.