Open Source Nextcloud Calendar AlternativesCalendar Apps like Nextcloud Calendar

The best open source alternative to Nextcloud Calendar is Tuta Mail. If that doesn't suit you, our users have ranked more than 25 alternatives to Nextcloud Calendar and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Nextcloud Calendar are Fossify Calendar, Tuta Calendar, Etar and Right Calendar.

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Alternatives list

  1. Tuta Mail icon

    Tuta Mail

     564 likes

    Offers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.

    109 Tuta Mail alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    • Android Tablet
    • Thunderbird
    Tuta Mail screenshot 1
     
  2. Fossify Calendar icon

    Fossify Calendar

     60 likes

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

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Fossify Calendar screenshot 1
     
  4. Tuta Calendar icon

    Tuta Calendar

     43 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.

    Cost / License

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    • Thunderbird
    Tuta Calendar screenshot 1
     
  5. Etar icon

    Etar

     86 likes

    Material design open source calendar for Android.

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Etar screenshot 1
     
  6. Right Calendar icon

    Right Calendar

     10 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 types

    Platforms

    • Android
    Right Calendar screenshot 1
     
  7. KashCal icon

    KashCal

     5 likes

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

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Android
    • F-Droid
    KashCal screenshot 1
     
  9. Baïkal icon

    Baïkal

     34 likes

    CalDAV and CardDAV server for calendar and contact data based on PHP, SQLite/MySQL, and SabreDAV

    13 Baïkal alternatives

    Cost / License

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • BSD
    • Windows Phone
    • iPad
    • MySQL Community Edition
    • Self-Hosted
    • NGINX
    • Apache HTTP Server
    • PHP
    • UberSpace
    • Cloudron
    • SQLite
    Dashboard
     
  10. Merkuro Calendar icon

    Merkuro Calendar

     13 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
    • Linux Mobile
    Merkuro Calendar screenshot 1
     
  11. 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
     
  12. 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!

    Cost / License

    • Freemium
    • 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
     
  13. hash-calendar icon

    hash-calendar

     1 like

    lightweight, client-only calendar web application. All data persists in the URL hash for instant sharing, No backend required. Optional AES-GCM password protection keeps shared links locked without a server.

    Cost / License

    • Freemium
    • Open Source (MIT)

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Docker
    • YunoHost
    hash-calendar screenshot 1
     
  14. muCalendar icon

    muCalendar

     1 like

    muCalendar is a lightweight, open-source desktop calendar application built for users who value privacy and simplicity. It brings your remote calendars — whether self-hosted or cloud-based — into a clean, native desktop experience.

    9 muCalendar alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Linux
    • Windows
    View events by week
     
12 of 14 Nextcloud Calendar alternatives