Best Duet Alternatives in 2026
Updated
20 apps from calendar apps ranked against Duet on the same published basis.
- 1Duet vs Mozilla Thunderbird
- 2Duet vs Microsoft Outlook Calendar
- 3Duet vs Lark
- 4Duet vs EGroupware
- 5Duet vs Proton Calendar
- 6Duet vs Teamup
- 7Duet vs Cozi
- 8Duet vs Calendar.com
- 9Duet vs TimeFinder
- 10Duet vs Notion Calendar
- 11Duet vs TimeTree
- 12Duet vs Fantastical
- 13Duet vs Doodle
- 14Duet vs Tuta Calendar
- 15Duet vs Reclaim AI
- 16Duet vs FlowSavvy
- 17Duet vs Musubi
- 18Duet vs Samsung Calendar
- 19Duet vs Trevor AI
- 20Duet vs Calendars by Readdle
Duet alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Mozilla Thunderbird | 9.0 | Free plan | Free | Android, Linux, Mac, Windows |
| 2 | Microsoft Outlook Calendar | 8.2 | Free plan | $1.67/mo | Android, iOS, Mac, Web |
| 3 | Lark | 8.2 | Free plan | Android, API, iOS, Linux, Mac, Web, Windows | |
| 4 | EGroupware | 8.2 | €21.90/mo | Web, Linux, Windows, Mac | |
| 5 | Proton Calendar | 8.0 | Free plan | Free | Android, iOS |
| 6 | Teamup | 8.0 | Free plan | $12/mo | Android, API, iOS, Web |
| 7 | Cozi | 8.0 | Free plan | $3.25/mo | Android, iOS, Web |
| 8 | Calendar.com | 8.0 | Free plan | $20/mo | Android, API, Browser, iOS, Web |
| 9 | TimeFinder | 8.0 | Free plan | Free | Android, iOS, Mac, Web, Windows |
| 10 | Notion Calendar | 7.9 | Free plan | Free | Android, iOS |
| 11 | TimeTree | 7.9 | Free plan | $3.75/mo | Android, iOS, Web |
| 12 | Fantastical | 7.9 | Free plan | Free | iOS, Mac, Windows |
| 13 | Doodle | 7.8 | Free plan | $11/mo | Web |
| 14 | Tuta Calendar | 7.8 | Free plan | €3/mo | Android, iOS |
| 15 | Reclaim AI | 7.8 | Free plan | $10/mo | Browser, Web |
| 16 | FlowSavvy | 7.8 | Free plan | Android, iOS, Web | |
| 17 | Musubi | 7.8 | Free plan | Free | Android, iOS, self-hosted, Web |
| 18 | Samsung Calendar | 7.7 | Free plan | Free | Android |
| 19 | Trevor AI | 7.7 | Free plan | $0.42/mo | Web |
| 20 | Calendars by Readdle | 7.7 | Free plan | $1.67/mo | iOS, Mac |
Make your app an alternative to Duet
See the priceThe sponsored alternative slot on this page is labelled Sponsored.
Questions about Duet alternatives
What is the best alternative to Duet?
Mozilla Thunderbird, number 1 in calendar apps with a score of 9.0 out of 10. The others here: Microsoft Outlook Calendar, Lark, EGroupware and 16 more.
What is the best free alternative to Duet?
Mozilla Thunderbird is the best-ranked alternative with a free plan. 19 of the 20 alternatives here publish a free plan on their own pricing pages.
Is there an open-source alternative to Duet?
Yes: Mozilla Thunderbird, EGroupware.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.