Best CustodySplit Alternatives in 2026

Updated October 2026

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

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

CustodySplit 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

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Questions about CustodySplit alternatives

What is the best alternative to CustodySplit?

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 CustodySplit?

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 CustodySplit?

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.