Best Microsoft Outlook Calendar Alternatives in 2026
Updated
20 platforms from calendar apps ranked against Microsoft Outlook Calendar on the same published basis.
- 1Microsoft Outlook Calendar vs Lark
- 2Microsoft Outlook Calendar vs Calendar.com
- 3Microsoft Outlook Calendar vs Teamup
- 4Microsoft Outlook Calendar vs 7shifts
- 5Microsoft Outlook Calendar vs Slotly
- 6Microsoft Outlook Calendar vs Mozilla Thunderbird
- 8Microsoft Outlook Calendar vs Proton Calendar
- 9Microsoft Outlook Calendar vs Reclaim AI
- 10Microsoft Outlook Calendar vs EGroupware
- 11Microsoft Outlook Calendar vs Notion Calendar
- 12Microsoft Outlook Calendar vs Doodle
- 13Microsoft Outlook Calendar vs Cozi
- 14Microsoft Outlook Calendar vs TimeTree
- 15Microsoft Outlook Calendar vs Google Calendar
- 16Microsoft Outlook Calendar vs Tuta Calendar
- 17Microsoft Outlook Calendar vs Fantastical
- 18Microsoft Outlook Calendar vs FlowSavvy
- 19Microsoft Outlook Calendar vs Trevor AI
- 20Microsoft Outlook Calendar vs Samsung Calendar
- 21Microsoft Outlook Calendar vs DayFront
Microsoft Outlook 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 | 7shifts | 8.1 | Free plan | Free | Android, API, iOS, Web |
| 5 | Slotly | 7.9 | Free plan | $0.83/mo | Android, API, Web |
| 6 | Mozilla Thunderbird | 7.6 | Free plan | Free | Android, Linux, Mac, Windows |
| 8 | Proton Calendar | 7.4 | Free plan | Free | Android, iOS |
| 9 | Reclaim AI | 7.4 | Free plan | $10/mo | Browser, Web |
| 10 | EGroupware | 7.4 | No | €21.90/mo | Web, Linux, Windows, Mac |
| 11 | Notion Calendar | 7.3 | Free plan | Free | Android, iOS |
| 12 | Doodle | 7.3 | Free plan | $11/mo | Web |
| 13 | Cozi | 7.3 | Free plan | $3.25/mo | Android, iOS, Web |
| 14 | TimeTree | 7.3 | Free plan | $3.75/mo | Android, iOS, Web |
| 15 | Google Calendar | 7.2 | No | $7/mo | Android, iOS |
| 16 | Tuta Calendar | 7.2 | Free plan | €3/mo | Android, iOS |
| 17 | Fantastical | 7.2 | Free plan | Free | iOS |
| 18 | FlowSavvy | 7.2 | Free plan | — | Android, iOS, Web |
| 19 | Trevor AI | 7.2 | Free plan | $0.42/mo | Web |
| 20 | Samsung Calendar | 7.1 | Free plan | Free | Android |
| 21 | DayFront | 7.1 | No | — | API, self-hosted, Web |
Make your platform an alternative to Microsoft Outlook Calendar
See the priceThe sponsored alternative slot on this page is labelled Sponsored.
Questions about Microsoft Outlook Calendar alternatives
What is the best alternative to Microsoft Outlook Calendar?
Lark, number 1 in calendar apps with a score of 8.8 out of 10. The others here: Calendar.com, Teamup, 7shifts and 16 more.
What is the best free alternative to Microsoft Outlook Calendar?
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 Microsoft Outlook 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.