Best Calendar.online Alternatives in 2026

Updated October 2026

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

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

Calendar.online alternatives compared

#	Tool	Score	Free plan	From	Runs on
1	Lark	9.2	Free plan	—	Android, API, iOS, Linux, Mac, Web, Windows
2	Calendar.com	9.1	Free plan	$20/mo	Android, API, Browser, iOS, Web
3	Microsoft Outlook Calendar	9.0	Free plan	$1.67/mo	Android, iOS, Mac, Web
4	Teamup	8.9	Free plan	$12/mo	Android, API, iOS, Web
5	Cozi	8.9	Free plan	$3.25/mo	Android, iOS, Web
6	TimeTree	8.9	Free plan	$3.75/mo	Android, iOS, Web
7	FlowSavvy	8.7	Free plan	—	Android, iOS, Web
8	Proton Calendar	8.6	Free plan	Free	Android, iOS
9	Reclaim AI	8.6	Free plan	$10/mo	Browser, Web
10	Trevor AI	8.4	Free plan	$0.42/mo	Web
11	TimeFinder	8.4	Free plan	Free	Android, iOS, Mac, Web, Windows
12	EGroupware	8.4	No	€21.90/mo	Web, Linux, Windows, Mac
13	FamilyWall	8.4	Free plan	$3.75/mo	Android, iOS, Web
14	Google Calendar	8.3	No	$7/mo	Android, iOS
15	Fantastical	8.3	Free plan	Free	iOS
16	Rise Calendar	8.3	Free plan	€10/mo	Android, iOS, Mac, Windows
17	Notion Calendar	8.2	Free plan	Free	Android, iOS
18	Mozilla Thunderbird	8.2	Free plan	Free	Android, Linux, Mac, Windows
19	Ellie Planner	8.2	Free plan	$9.99/mo	iOS, Mac, Web, Windows
20	Sorted³	8.2	Free plan	$14.99/mo	iOS, Mac

Make your tool an alternative to Calendar.online

The sponsored alternative slot on this page is labelled Sponsored.

See the price

Questions about Calendar.online alternatives

What is the best alternative to Calendar.online?

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 Calendar.online?

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 Calendar.online?

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.