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Best Merkuro Calendar (formerly Kalendar) Alternatives in 2026

Updated

20 platforms from calendar apps ranked against Merkuro Calendar (formerly Kalendar) on the same published basis.

  1. 1
    Lark Free plan AndroidapiiOSLinuxMac 8.8
    Merkuro Calendar (formerly Kalendar) vs Lark
  2. 2
    Calendar.com Free plan AndroidapiextensioniOSWeb $20/mo8.8
    Merkuro Calendar (formerly Kalendar) vs Calendar.com
  3. 3
    Teamup Free plan AndroidapiiOSWeb $12/mo8.7
    Merkuro Calendar (formerly Kalendar) vs Teamup
  4. 4
    Calendar.online Free plan AndroidapiiOSWeb $6.90/mo8.3
    Merkuro Calendar (formerly Kalendar) vs Calendar.online
  5. 5
    7shifts Free plan AndroidapiiOSWeb Free8.1
    Merkuro Calendar (formerly Kalendar) vs 7shifts
  6. 6
    Slotly Free plan AndroidapiWeb $0.83/mo7.9
    Merkuro Calendar (formerly Kalendar) vs Slotly
  7. 7
    Tandem Free plan AndroidapiiOSWeb $20/mo7.9
    Merkuro Calendar (formerly Kalendar) vs Tandem
  8. 8
    Mozilla Thunderbird Free plan Open sourceAndroidLinuxMacWin Free7.6
    Merkuro Calendar (formerly Kalendar) vs Mozilla Thunderbird
  9. 9
    Microsoft Outlook Calendar Free plan AndroidiOSMacWeb $1.67/mo7.5
    Merkuro Calendar (formerly Kalendar) vs Microsoft Outlook Calendar
  10. 10
    Proton Calendar Free plan AndroidiOS Free7.4
    Merkuro Calendar (formerly Kalendar) vs Proton Calendar
  11. 11
    Reclaim AI Free plan extensionWeb $10/mo7.4
    Merkuro Calendar (formerly Kalendar) vs Reclaim AI
  12. 12
    EGroupware Free trial Open sourceWebLinuxWinMac €21.90/mo7.4
    Merkuro Calendar (formerly Kalendar) vs EGroupware
  13. 13
    Rallly Free plan apiself-hostedWeb $0.50/mo7.4
    Merkuro Calendar (formerly Kalendar) vs Rallly
  14. 14
    Notion Calendar Free plan AndroidiOS Free7.3
    Merkuro Calendar (formerly Kalendar) vs Notion Calendar
  15. 15
    Doodle Free plan Web $11/mo7.3
    Merkuro Calendar (formerly Kalendar) vs Doodle
  16. 16
    Cozi Free plan AndroidiOSWeb $3.25/mo7.3
    Merkuro Calendar (formerly Kalendar) vs Cozi
  17. 17
    TimeTree Free plan AndroidiOSWeb $3.75/mo7.3
    Merkuro Calendar (formerly Kalendar) vs TimeTree
  18. 18
    Fantastical Free plan iOSMacWin Free7.3
    Merkuro Calendar (formerly Kalendar) vs Fantastical
  19. 19
    Google Calendar AndroidiOS $7/mo7.2
    Merkuro Calendar (formerly Kalendar) vs Google Calendar
  20. 20
    Tuta Calendar Free plan AndroidiOSLinuxMacWeb €3/mo7.2
    Merkuro Calendar (formerly Kalendar) vs Tuta Calendar

Merkuro Calendar (formerly Kalendar) alternatives compared

#PlatformScoreFree planFromRuns on
1Lark8.8Free planAndroid, API, iOS, Linux, Mac, Web, Windows
2Calendar.com8.8Free plan$20/moAndroid, API, Browser, iOS, Web
3Teamup8.7Free plan$12/moAndroid, API, iOS, Web
4Calendar.online8.3Free plan$6.90/moAndroid, API, iOS, Web
57shifts8.1Free planFreeAndroid, API, iOS, Web
6Slotly7.9Free plan$0.83/moAndroid, API, Web
7Tandem7.9Free plan$20/moAndroid, API, iOS, Web
8Mozilla Thunderbird7.6Free planFreeAndroid, Linux, Mac, Windows
9Microsoft Outlook Calendar7.5Free plan$1.67/moAndroid, iOS, Mac, Web
10Proton Calendar7.4Free planFreeAndroid, iOS
11Reclaim AI7.4Free plan$10/moBrowser, Web
12EGroupware7.4€21.90/moWeb, Linux, Windows, Mac
13Rallly7.4Free plan$0.50/moAPI, self-hosted, Web
14Notion Calendar7.3Free planFreeAndroid, iOS
15Doodle7.3Free plan$11/moWeb
16Cozi7.3Free plan$3.25/moAndroid, iOS, Web
17TimeTree7.3Free plan$3.75/moAndroid, iOS, Web
18Fantastical7.3Free planFreeiOS, Mac, Windows
19Google Calendar7.2$7/moAndroid, iOS
20Tuta Calendar7.2Free plan€3/moAndroid, iOS, Linux, Mac, Web, Windows
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Questions about Merkuro Calendar (formerly Kalendar) alternatives

What is the best alternative to Merkuro Calendar (formerly Kalendar)?

Lark, number 1 in calendar apps with a score of 8.8 out of 10. The others here: Calendar.com, Teamup, Calendar.online and 16 more.

What is the best free alternative to Merkuro Calendar (formerly Kalendar)?

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 Merkuro Calendar (formerly Kalendar)?

Yes: Mozilla Thunderbird, EGroupware.

How are these alternatives ranked?

Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.