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Instead of Microsoft Outlook Calendar

Microsoft Outlook Calendar alternatives

Microsoft Outlook Calendar brings scheduling together with email across web, desktop, and mobile, with apps for iOS and Android. Shared calendars and video meetings support coordination, while connections to Gmail, Yahoo!, iCloud, and other mail services let it sit alongside more than Outlook.com. Outlook Free includes 15 GB of mailbox storage, 5 GB of cloud storage, and core security features. Microsoft 365 plans add access to Office files and ongoing support; paid plans start at $9.99 per user per month, and some subscriptions offer a one-month trial.

  1. 1

    Mozilla Thunderbird

    by Mozilla Thunderbird
    Free plan Open source AndroidLinuxMac+1

    Free, open-source calendar and email across desktop platforms — Thunderbird adds an open-source unified inbox, offline access, and scheduled sending, while Outlook combines calendar with Microsoft services and supports mobile apps.

    9.1 Free plan Visit site
  2. 2

    Tuta Calendar

    by Tuta Calendar
    Free plan AndroidiPhoneLinux+3

    Appointments, meetings, and repeating tasks across platforms — Tuta Calendar focuses on appointments, business meetings, and repeating tasks, with Linux support beyond Outlook Calendar's platform set.

    7.7 Free plan · paid from €3/user/mo Visit site
  3. 3

    Lark

    by Lark
    Free plan AndroidAPIiPhone+4

    Teams combining chat, calendar, documents, and cloud storage — Lark bundles chat, calendar, document creation, and cloud storage, and meetings let participants edit shared Docs during calls.

    7.7 Free plan Visit site
  4. 4

    EGroupware

    by EGroupware
    Free plan Open source AndroidAPIiPhone+5

    Open-source shared calendars with two-way sync — EGroupware offers open-source shared calendars with two-way sync, while Outlook Calendar's sync is one-way; it has no mobile apps.

    9.1 Free plan · paid from €21.90/mo · 30-day trial Visit site
  5. 5

    Zoho Calendar

    by Zoho Calendar
    Free plan AndroidiPhoneWeb

    Scheduling links and time blocking on mobile or web — Zoho Calendar adds time blocking, scheduling links, and two-way sync, unlike Outlook Calendar's one-way sync.

    7.5 Free plan Visit site
  6. 6

    Proton Calendar

    by Proton Calendar
    Free plan AndroidiPhone

    Mobile calendar with shared calendars and scheduling links — Proton Calendar offers shared calendars and scheduling links on iOS and Android, while Outlook Calendar also covers web and desktop.

    Free plan Visit site
  7. 7

    Teamup

    by TeamUp
    Free plan AndroidAPIiPhone+4

    Shared calendars with time blocking and web or mobile access — Teamup combines shared calendars and time blocking with web and mobile access, while Outlook Calendar supports video meetings and desktop platforms.

    7.7 Free plan · paid from $12/mo (annual) · 3-day trial Visit site
  8. 8

    Twake Calendar

    by Twake Calendar
    Free plan Open source AndroidAPIiPhone+5
    9.1 Free plan · paid from €4/mo Visit site
  9. 9

    Calendar.com

    by Calendar.com
    Free plan AndroidAPIExtension+2
    7.6 Free plan · paid from $20/mo · 14-day trial Visit site
  10. 10

    TimeFinder

    by TimeFinder
    Free plan AndroidiPhoneMac+2
    7.6 Free plan · 7-day trial Visit site
  11. 11

    Structured

    Free plan AndroidiPhoneMac+1
    7.6 Free plan · 3-day trial Visit site
  12. 12

    Musubi

    by Musubi
    Free plan AndroidiPhoneSelf-hosted+1
    7.6 Free plan Visit site
  13. 13

    Daybridge

    by Daybridge
    Free plan AndroidiPhoneMac+1
    7.6 Free plan · 7-day trial Visit site
  14. 14

    Cozi

    by Cozi
    Free plan AndroidiPhoneWeb
    7.5 Free plan · paid from $39/yr · 14-day trial Visit site
  15. 15

    TimeTree

    by TimeTree
    Free plan AndroidiPhoneWeb
    7.5 Free plan · paid from $4.49/mo Visit site
  16. 16

    Fantastical

    Free plan iPhoneMacWindows
    7.5 Free plan · 14-day trial Visit site
  17. 17

    FlowSavvy

    Free plan AndroidiPhoneWeb
    7.5 Free plan · paid from $10/user/mo (annual) · 7-day trial Visit site
  18. 18

    Amie

    Free plan APIExtensioniPhone+3
    7.5 Free plan · 7-day trial Visit site
  19. 19

    Vimcal

    Free plan iPhoneMacWeb+1
    7.5 Free plan · paid from $35/mo Visit site
  20. 20

    Tweek

    by Tweek
    Free plan AndroidiPhoneMac+1
    7.5 Free plan · paid from $5.99/user/mo · 14-day trial Visit site
  21. 21

    WebCalendar

    by WebCalendar
    Free plan APILinuxSelf-hosted+1
    7.5 Free plan Visit site
  22. 22

    OnTime Group Calendar

    by OnTime Group Calendar
    Free plan AndroidAPIiPhone+4
    7.5 Free plan · 60-day trial Visit site
  23. 23

    Rise Calendar

    by Rise Calendar
    Free plan AndroidiPhoneMac+1
    7.5 Free plan · paid from €10/user/mo (annual) Visit site
  24. 24

    CalenGoo

    by CalenGoo
    Free plan AndroidiPhoneLinux+3
    7.5 3-day trial Visit site
  25. 25

    Informant

    Free plan AndroidExtensioniPhone+2
    7.5 Free plan · paid from $3.99/user/mo · 7-day trial Visit site

A different calendar may be a better fit if you want two-way sync, scheduling links, or planning features such as time blocking. Options also differ in platform coverage: several support Linux, while Proton Calendar is limited to iOS and Android. Some bundle calendars with workplace chat, documents, or cloud storage; others offer free access or open-source software. Before switching, weigh the devices you use, whether you need shared calendars or video meetings, and how much you value calendar-only tools versus a wider work suite.

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