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 Tuta, Calendar Lock PEA, Fossify Calendar and Nextcloud Calendar.

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Google Calendar alternatives are mainly Calendar Apps but may also be Email Clients or Appointment Schedulers. Other popular filters includes Android + Open Source. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Google Calendar.

Google Calendar

929

Calendar App
Free • Proprietary

With Google Calendar, its easy to keep track of all your lifes important events in one place. You can add events and send invitations effortlessly, share your schedule with friends and family, and search for events you...

More about Google Calendar

Google Calendar alternatives page was last updated Jul 2, 2024

Etar
Material design open source calendar for Android.
48 Etar alternatives
License model
- Free • Open Source
Application type
- Calendar App
Platforms
- Android
- Android Tablet
- F-Droid
+8
Etar Features
1. Material design
2. Lightweight
3. Ad-free
4. Privacy focused
5. No Tracking
6. Works Offline
7. Dark Mode
8. Multiple Account support
9. GPS Location Tracking
Show all NaN Etar features ▾
Etar VS Google Calendar
Is Etar a good alternative to Google Calendar?
Comments about Etar as an Alternative to Google Calendar

Guest
Nice, clean, and to the point calendar!
Positive comment •Nov 23, 2019
6
Third Opinion
Import and export function is listed but it didnt work for me at all. Worse, on my latest phone I could not even import an ICS file with all my stuff.
Negative comment •Apr 12, 2022
1
paddling583
It has a terrible interface and the description lied about it being a material design. It also lacks export and sync.
Negative comment •Jul 2, 2024
1
Guest
Open source and works well !!
Positive comment •Apr 2, 2018
-1
- 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 and Proprietary
- Etar is Lightweight and Privacy focusedGoogle Calendar is not according to our users

Tuta
Tuta is an all-in-one email, calendar and contacts app which protects your data with full end-to-end encryption and it requires zero personal information. Tuta is built with open source software so you can inspect every piece of code running on your devices so you can be sure...
93 Tuta alternatives
License model
- Freemium • Open Source
Application types
- WebMail Provider
- Calendar App
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- iPad
- Self-Hosted
- Flathub
- F-Droid
+6
Top Tuta Features
1. Privacy focused
2. Encrypted Email
3. End-to-End Encryption
4. Dark Mode
5. Custom Domain
6. Encrypted calendar
7. Contacts
8. Integrated File Sharing
9. No Tracking
10. Multiple Account support
11. Lightweight
12. Email Organizer
Show all NaN Tuta features ▾
Tuta VS Google Calendar
Is Tuta a good alternative to Google Calendar?
- Tuta is the most popular Web-based, Windows, Mac, iPhone, Linux, iPad & Self-Hosted alternative to Google Calendar.
- Tuta is Freemium and Open SourceGoogle Calendar is Free and Proprietary
- Tuta is Privacy focused and LightweightGoogle Calendar is not according to our users

Calendar Lock PEA
Calendar encryption: View calendars and stores them encrypted on your device or in the cloud.
63 Calendar Lock PEA alternatives
License model
- Free • Open Source
Application type
- Calendar App
Platforms
- Mac
- Windows
- Linux
Calendar Lock PEA Features
Privacy focused
Password encryption
Authenticated encryption
Encrypted Notes
Show all NaN Calendar Lock PEA features ▾
Calendar Lock PEA VS Google Calendar
Is Calendar Lock PEA a good alternative to Google Calendar?

Fossify Calendar
Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.
49 Fossify Calendar alternatives
+5
License model
- Free • Open Source
Application type
- Calendar App
Platforms
- Android
- F-Droid
- Android Tablet
Top Fossify Calendar Features
1. Ad-free
2. No registration required
3. No Tracking
4. Privacy focused
5. Works Offline
6. Calendar View
7. Dark Mode
8. Reminders
9. Calendar Integration
10. Support for Themes
11. Multiple Account support
12. Sync with Google Calendar
Show all NaN Fossify Calendar features ▾
Fossify Calendar VS Google Calendar
Is Fossify Calendar a good alternative to Google Calendar?

Nextcloud Calendar
The Calendar app is a user interface for Nextcloud's CalDAV server. Easily sync events from various devices with your Nextcloud and edit them online.
27 Nextcloud Calendar alternatives
License model
- Free • Open Source
Application type
- Calendar App
Platforms
- Online
- Self-Hosted
Top Nextcloud Calendar Features
1. Cloud Sync
2. Privacy focused
3. Calendar Integration
4. Full-Text Search
5. Calendar View
6. No Tracking
7. Reminders
8. Dark Mode
9. Subtasks
10. Support for @mentions
11. Two-factor Authentication
12. Ad-free
Show all NaN Nextcloud Calendar features ▾
Nextcloud Calendar VS Google Calendar
Is Nextcloud Calendar a good alternative to Google Calendar?
Comments about Nextcloud Calendar as an Alternative to Google Calendar

Guest
Free (and open source) alternative. Your data is yours !
Positive comment •Nov 30, 2019
3
- Almost everyone thinks Nextcloud Calendar is a great Google Calendar alternative.
- Nextcloud Calendar is Free and Open SourceGoogle Calendar is Free and Proprietary
- Nextcloud Calendar is Privacy focusedGoogle Calendar is not according to our users

Kontact
Personal Information Manager (Mail, Contact, Calendar and more).
114 Kontact alternatives
License model
- Free • Open Source
Application types
- Calendar App
- Email Client
Platforms
- Linux
Kontact Features
1. Google integration
2. Convert Email to Task
3. KDE
4. Feed Reader
5. Personal Information Manager (PIM)
6. Contacts
Show all NaN Kontact features ▾
Kontact VS Google Calendar
Is Kontact a good alternative to Google Calendar?

fruux
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!
50 fruux alternatives
License model
- Freemium • Open Source
Application type
- Calendar App
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Blackberry
- Windows Phone
- iPad
- Blackberry 10
- Sailfish OS
- Software as a Service (SaaS)
fruux Features
1. CardDAV Support
2. Contacts
3. CalDAV Support
4. Sync Contacts
5. Calendar Sync
6. CalDAV Server
Show all NaN fruux features ▾
fruux VS Google Calendar
Is fruux a good alternative to Google Calendar?
- 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 and Proprietary

Kolab Community
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
44 Kolab Community alternatives
License model
- Freemium • Open Source
Platforms
- Linux
- Online
- Self-Hosted
Kolab Community Features
1. Real time collaboration
2. CalDAV Support
3. WebDAV Support
4. IMAP Support
5. CardDAV Support
Show all NaN Kolab Community features ▾
Kolab Community VS Google Calendar
Is Kolab Community a good alternative to Google Calendar?

Kalendar
Kalendar is a Kirigami-based calendar application that uses Akonadi. It lets you add, edit and delete events from local and remote accounts of your choice, while keeping changes syncronised across your Plasma desktop or phone.
107 Kalendar alternatives
License model
- Free • Open Source
Application type
- Calendar App
Platforms
- Linux
+5
Kalendar Features
1. KDE Plasma integration
2. KDE
3. Dark Mode
4. Ad-free
5. Sync with Google Calendar
6. Calendar Sync
Show all NaN Kalendar features ▾
Kalendar VS Google Calendar
Is Kalendar a good alternative to Google Calendar?

Kontact - KOrganizer
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...
42 Kontact - KOrganizer alternatives
License model
- Free • Open Source
Application types
- Calendar App
- Todo List Manager
Platforms
- Linux
- KDE
Kontact - KOrganizer Features
Scheduling
Personal Information Manager (PIM)
Show all NaN Kontact - KOrganizer features ▾
Kontact - KOrganizer VS Google Calendar
Is Kontact - KOrganizer a good alternative to Google Calendar?