Best Merkuro Calendar Alternatives in 2026

Updated October 2026

20 platforms from calendar apps ranked against Merkuro Calendar on the same published basis.

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

Merkuro Calendar alternatives compared

#	Platform	Score	Free plan	From	Runs on
1	Lark	8.8	Free plan		Android, API, iOS, Linux, Mac, Web, Windows
2	Calendar.com	8.8	Free plan	$20/mo	Android, API, Browser, iOS, Web
3	Teamup	8.7	Free plan	$12/mo	Android, API, iOS, Web
4	Calendar.online	8.3	Free plan	$6.90/mo	Android, API, iOS, Web
5	7shifts	8.1	Free plan	Free	Android, API, iOS, Web
6	Slotly	7.9	Free plan	$0.83/mo	Android, API, Web
7	Tandem	7.9	Free plan	$20/mo	Android, API, iOS, Web
8	Mozilla Thunderbird	7.6	Free plan	Free	Android, Linux, Mac, Windows
9	Microsoft Outlook Calendar	7.5	Free plan	$1.67/mo	Android, iOS, Mac, Web
10	Proton Calendar	7.4	Free plan	Free	Android, iOS
11	Reclaim AI	7.4	Free plan	$10/mo	Browser, Web
12	EGroupware	7.4		€21.90/mo	Web, Linux, Windows, Mac
13	Rallly	7.4	Free plan	$0.50/mo	API, self-hosted, Web
14	Notion Calendar	7.3	Free plan	Free	Android, iOS
15	Doodle	7.3	Free plan	$11/mo	Web
16	Cozi	7.3	Free plan	$3.25/mo	Android, iOS, Web
17	TimeTree	7.3	Free plan	$3.75/mo	Android, iOS, Web
18	Fantastical	7.3	Free plan	Free	iOS, Mac, Windows
19	Google Calendar	7.2		$7/mo	Android, iOS
20	Tuta Calendar	7.2	Free plan	€3/mo	Android, iOS, Linux, Mac, Web, Windows

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Questions about Merkuro Calendar alternatives

What is the best alternative to Merkuro Calendar?

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?

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?

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.