Best Calendar 366 Alternatives in 2026
Updated
20 tools from calendar apps ranked against Calendar 366 on the same published basis.
- 1Calendar 366 vs Lark
- 2Calendar 366 vs Calendar.com
- 3Calendar 366 vs Microsoft Outlook Calendar
- 4Calendar 366 vs TimeFinder
- 5Calendar 366 vs Teamup
- 6Calendar 366 vs Cozi
- 7Calendar 366 vs TimeTree
- 8Calendar 366 vs Fantastical
- 9Calendar 366 vs Tweek
- 10Calendar 366 vs FlowSavvy
- 11Calendar 366 vs Informant
- 12Calendar 366 vs Proton Calendar
- 13Calendar 366 vs Reclaim AI
- 14Calendar 366 vs Calendars by Readdle
- 15Calendar 366 vs Amie
- 16Calendar 366 vs Trevor AI
- 17Calendar 366 vs EGroupware
- 18Calendar 366 vs SkedPal
- 19Calendar 366 vs FamilyWall
- 20Calendar 366 vs Google Calendar
Calendar 366 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 | TimeFinder | 9.0 | Free plan | Free | Android, iOS, Mac, Web, Windows |
| 5 | Teamup | 8.9 | Free plan | $12/mo | Android, API, iOS, Web |
| 6 | Cozi | 8.9 | Free plan | $3.25/mo | Android, iOS, Web |
| 7 | TimeTree | 8.9 | Free plan | $3.75/mo | Android, iOS, Web |
| 8 | Fantastical | 8.9 | Free plan | Free | iOS, Mac, Windows |
| 9 | Tweek | 8.8 | Free plan | $4.17/mo | Android, iOS, Mac, Web |
| 10 | FlowSavvy | 8.7 | Free plan | Android, iOS, Web | |
| 11 | Informant | 8.7 | Free plan | Android, Browser, iOS, Mac, Web | |
| 12 | Proton Calendar | 8.6 | Free plan | Free | Android, iOS |
| 13 | Reclaim AI | 8.6 | Free plan | $10/mo | Browser, Web |
| 14 | Calendars by Readdle | 8.6 | Free plan | $1.67/mo | iOS, Mac |
| 15 | Amie | 8.6 | Free plan | Free | iOS, Mac, Windows |
| 16 | Trevor AI | 8.4 | Free plan | $0.42/mo | Web |
| 17 | EGroupware | 8.4 | €21.90/mo | Web, Linux, Windows, Mac | |
| 18 | SkedPal | 8.4 | No | $9.95/mo | Android, iOS, Linux, Mac, Web, Windows |
| 19 | FamilyWall | 8.4 | Free plan | $3.75/mo | Android, iOS, Web |
| 20 | Google Calendar | 8.3 | $7/mo | Android, iOS |
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Questions about Calendar 366 alternatives
What is the best alternative to Calendar 366?
Lark, number 1 in calendar apps with a score of 9.2 out of 10. The others here: Calendar.com, Microsoft Outlook Calendar, TimeFinder and 16 more.
What is the best free alternative to Calendar 366?
Lark is the best-ranked alternative with a free plan. 17 of the 20 alternatives here publish a free plan on their own pricing pages.
Is there an open-source alternative to Calendar 366?
Yes: EGroupware.
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.