The Best Open Source Google Calendar AlternativesTop Calendar Apps like Google Calendar

The best open source alternative to Google Calendar is Etar. If that doesn't suit you, our users have ranked more than 100 alternatives to Google Calendar and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Calendar are Fossify Calendar, Calendar Lock PEA, Tuta Calendar and Nextcloud Calendar.

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Google Calendar alternatives are mainly Calendar Apps, but if you're looking for Todo List Managers or Email Clients you can filter on that. Other popular filters include Open Source, Self-Hosted, Android, Android + Open Source, Linux, iPhone and Free. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Google Calendar.
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Alternatives list

  1. Etar icon

    Etar

     84 likes

    Material design open source calendar for Android.

    49 Etar alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Etar screenshot 1
     
    |
    5
    56
    Comments about Etar as an Alternative to Google Calendar
    Top Positive Comment
    Guest
    6

    Nice, clean, and to the point calendar!

    Review by a new / low-activity user.
    Top Negative Comment
    paddling583
    4

    It has a terrible interface and the description lied about it being a material design. It also lacks export and sync.

    Guest
    Negative
    0

    does not conform to UNIX principles (let the application be one, but it will work well and cooperate with other functions and applications in the system); The interface is hideous. Nothing is anywhere, it's hard to figure out; It is not practical. Notion Calendar or Apple Calendar for example have a lot of common handy features that Etar doesn't have;

    Review by a new / low-activity user.
    3 of 5 comments
    Google Calendar Icon
    Etar icon

    • Almost everyone thinks Etar is a great Google Calendar alternative.

    • Etar is the most popular Android & Android Tablet alternative to Google Calendar.

    • Etar is the most popular Open Source & free alternative to Google Calendar.

    • Etar is Free and Open SourceGoogle Calendar is Free Personal and Proprietary
    • Etar is Lightweight and Privacy focusedGoogle Calendar is not according to our users
  2. Fossify Calendar icon

    Fossify Calendar

     52 likes

    Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.

    51 Fossify Calendar alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Fossify Calendar screenshot 1
    Fossify Calendar screenshot 2
    Fossify Calendar screenshot 3
     
    |
    1
    9
    Comments about Fossify Calendar as an Alternative to Google Calendar
    Guest
    Positive
    0

    Customizable and you have control over your data.

    Review by a new / low-activity user.
    Google Calendar Icon
    Fossify Calendar icon

    • Almost everyone thinks Fossify Calendar is a great Google Calendar alternative.

    • Fossify Calendar is Free and Open SourceGoogle Calendar is Free Personal and Proprietary
    • Fossify Calendar is Privacy focused, Customizable and LightweightGoogle Calendar is not according to our users
  4. Calendar Lock PEA icon

    Calendar Lock PEA

     17 likes

    Calendar encryption: View calendars and stores them encrypted on your device or in the cloud.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    week view
     
    |
    50

    • Almost everyone thinks Calendar Lock PEA is a great Google Calendar alternative.

    • Calendar Lock PEA is the most popular Windows, Mac & Linux alternative to Google Calendar.

    • Calendar Lock PEA is Free and Open SourceGoogle Calendar is Free Personal and Proprietary
    • Calendar Lock PEA is Privacy focusedGoogle Calendar is not according to our users
  5. Tuta Calendar icon

    Tuta Calendar

     35 likes

    Tuta Calendar offers secure event organization with end-to-end encryption and no ads or tracking. Enjoy multi-device sync, multiple calendar views, and offline access. Fully compliant with strict German data protection laws. Manage recurring events, unlimited calendars, and seamlessly integrate with Tuta Mail.

    32 Tuta Calendar alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source (GPL-3.0)

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Tuta Calendar screenshot 1
     
    |
    1
    Comments about Tuta Calendar as an Alternative to Google Calendar
    JOPloume
    Positive
    0

    End-to-end encryption and works across all platforms: for me, on Android, Mac, and Windows (and even via Browser)!

    Review by a new / low-activity user.
    Google Calendar Icon
    Tuta Calendar icon
    • Tuta Calendar is Freemium and Open SourceGoogle Calendar is Free Personal and Proprietary
    • Tuta Calendar is Privacy focused and CustomizableGoogle Calendar is not according to our users
  6. Nextcloud Calendar icon

    Nextcloud Calendar

     30 likes

    Calendar interface for CalDAV enabling cross-device event sync, web-based editing, recurring events, Nextcloud Contacts integration, WebCal subscriptions, attendee invites, color coding, event notifications, privacy-focused hosting, and import/export support.

    32 Nextcloud Calendar alternatives

    Cost / License

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Nextcloud
    Nextcloud Calendar screenshot 1
     
    |
    1
    15
    Comments about Nextcloud Calendar as an Alternative to Google Calendar
    Guest
    Positive
    3

    Free (and open source) alternative. Your data is yours !

    Review by a new / low-activity user.
    Google Calendar Icon
    Nextcloud Calendar icon

    • Almost everyone thinks Nextcloud Calendar is a great Google Calendar alternative.

    • Nextcloud Calendar is the most popular Self-Hosted alternative to Google Calendar.

    • Nextcloud Calendar is Free and Open SourceGoogle Calendar is Free Personal and Proprietary
    • Nextcloud Calendar is Privacy focusedGoogle Calendar is not according to our users
  7. fruux icon

    fruux

     36 likes

    fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!

    57 fruux alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Blackberry
    • Windows Phone
    • iPad
    • Blackberry 10
    • Sailfish OS
    • Software as a Service (SaaS)
    fruux screenshot 1
     

    • Most users think fruux is a great Google Calendar alternative.

    • fruux is the most popular SaaS alternative to Google Calendar.

    • fruux is Freemium and Open SourceGoogle Calendar is Free Personal and Proprietary
  9. Right Calendar icon

    Right Calendar

     9 likes

    Right Calendar app is a versatile scheduling tool that offers unparalleled flexibility to its users. One of its standout features is that it is built on an open-source platform. This not only ensures transparency but also allows for constant updates and bug fixes from a...

    Cost / License

    Application type

    Platforms

    • Android
    Right Calendar screenshot 1
    Right Calendar screenshot 2
    Right Calendar screenshot 3
     
  10. Kolab icon

    Kolab

     43 likes

    Kolab provides a FOSS communication & collaboration solution that can be completely self-hosted. Take back control of your data and access it via the webinterface, or existing mobile & desktop clients.

    48 Kolab alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Linux
    • Online
    • Self-Hosted
     
  11. Merkuro Calendar icon

    Merkuro Calendar

     11 likes

    Merkuro is a calendar and contact application that allows you to manage your tasks, events and contacts. Merkuro supports both local calendars as well as a multitude of online calendars: Nextcloud, Google® Calendar, Outlook®, Caldav, and many more.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Linux
    • Flathub
    • Flatpak
    Merkuro Calendar screenshot 1
     
  13. KOrganizer icon

    KOrganizer

     18 likes

    It provides management of events and tasks, alarm notification, web export, network transparent handling of data, group scheduling, import and export of calendar files and more. It is able to work together with a wide variety of calendaring services, including NextCloud, Kolab...

    43 KOrganizer alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Linux
    • KDE Plasma
    KOrganizer screenshot 1
     
  14. KashCal icon

    KashCal

     2 likes

    A privacy-first calendar that works offline and looks beautiful. Connect to iCloud — or don't. Your schedule, your choice.

    49 KashCal alternatives

    Cost / License

    • Free
    • Open Source

    Platforms

    • Android
    • F-Droid
    KashCal screenshot 1
    KashCal screenshot 2
    KashCal screenshot 3
     
12 of 26 Google Calendar alternatives