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 Proton Calendar, Simple Calendar, Calendar Lock PEA and Lightning Calendar.

Google Calendar alternatives are mainly Calendar Apps but may also be Todo List Managers or Email Clients. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Google Calendar.

Google Calendar

926

Free • Proprietary
Calendar App

With Google Calendar, its easy to keep track of all your lifes important events in one place. You can add events and send...

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Etar
Is this is a good alternative?
Yes
No
Free • Open Source
Calendar App
Android
Android Tablet
F-Droid
43 Etar alternatives
Material design open source calendar for Android.
- - Etar is the most popular Android Tablet alternative to Google Calendar.
- - Etar is the most popular Open Source alternative to Google Calendar.
Suggest and vote on features
Etar Features
1. LightweightEtar consumes less device resources compared to similar apps.
2. Ad-freeEtar doesn't contain any form of external advertising.
3. Privacy focusedEtar is considered a privacy friendly alternative.
4. No TrackingEtar will not track you or use your personal data.
Material design
GPS Location Tracking
Comments about Etar as a Alternative to Google Calendar
Almost everyone thinks Etar is a great Google Calendar alternative.
Guest
Nice, clean, and to the point calendar!
Positive comment •
7

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 •
0

Guest
Open source and works well !!
Positive comment •
0
Proton Calendar
Is this is a good alternative?
Yes
No
Freemium • Open Source
Calendar App
Online
Android
iPhone
Android Tablet
Tor
28 Proton Calendar alternatives
Your calendar is a record of your life. Proton Calendar helps keep it private.
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Proton Calendar Features
1. Privacy focusedProton Calendar is considered a privacy friendly alternative.
2. End-to-End EncryptionProton Calendar has E2E Encryption, for entire or parts of the app.
3. Two-factor AuthenticationProton Calendar supports two-factor authentication (2FA).
4. RemindersProton Calendar allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
5. Dark ModeProton Calendar supports dark mode for comfortable usage in low light conditions.
6. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
7. Ad-freeProton Calendar doesn't contain any form of external advertising.
8. No TrackingProton Calendar will not track you or use your personal data.
9. Calendar IntegrationProton Calendar lets you sync your tasks and events with your calendar application.
Integrated Search
Sync with Google Calendar
Comments about Proton Calendar as a Alternative to Google Calendar
Almost everyone thinks Proton Calendar is a great Google Calendar alternative.
Deividas Losikov
ProtonCalendar may not be as feature-rich as Google Calendar, but their main focus is protecting user data with end-to-end encryption. The free plan is enough for basic calendar functionality, but paid subscriptions give extra benefits for supporting their business model, as that's their only source of income.
Positive comment •
1

newbread
ProtonCalendar is still missing the search feature.
Comment •
1
Simple Calendar
Is this is a good alternative?
Yes
No
Freemium • Open Source
Calendar App
Android
Android Tablet
F-Droid
98 Simple Calendar alternatives
A simple calendar with optional CalDAV synchronization. You can easily create recurring events and setup reminders, it can also display week numbers.
Suggest and vote on features
Simple Calendar Features
1. Dark ModeSimple Calendar supports dark mode for comfortable usage in low light conditions.
2. No TrackingSimple Calendar will not track you or use your personal data.
3. Works OfflineSimple Calendar can be used without the need to connect to the internet.
4. RemindersSimple Calendar allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
5. Privacy focusedSimple Calendar is considered a privacy friendly alternative.
6. Ad-freeSimple Calendar doesn't contain any form of external advertising.
Notifications
WebDAV Support
Customizable
Built-in Calendar
Comments about Simple Calendar as a Alternative to Google Calendar
Almost everyone thinks Simple Calendar is a great Google Calendar alternative.
Guest
Open source, has widgets and is quite configurable
Positive comment •
3

Malkhaz Nikolashvili
I really prefer Google Calendar
Positive comment •
-3
Calendar Lock PEA
Is this is a good alternative?
Yes
No
Free • Open Source
Calendar App
Mac
Windows
Linux
59 Calendar Lock PEA alternatives
Calendar encryption: View calendars and stores them encrypted on your device or in the cloud.
Suggest and vote on features
Calendar Lock PEA Features
1. Privacy focusedCalendar Lock PEA is considered a privacy friendly alternative.
Password encryption
Authenticated encryption
Encrypted Notes
Opinions about Calendar Lock PEA as a Alternative to Google Calendar
Almost everyone thinks Calendar Lock PEA is a great Google Calendar alternative.
Lightning Calendar
Is this is a good alternative?
Yes
No
Free • Open Source
Calendar App
Task Management Tool
Mac
Windows
Linux
Thunderbird
SeaMonkey
77 Lightning Calendar alternatives
Organize your schedule and life’s important events in a calendar that’s fully integrated with your Thunderbird or Seamonkey email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Suggest and vote on features
Lightning Calendar Features
1. Ad-freeLightning Calendar doesn't contain any form of external advertising.
2. Calendar IntegrationLightning Calendar lets you sync your tasks and events with your calendar application.
CardDAV Support
CalDAV Support
Opinions about Lightning Calendar as a Alternative to Google Calendar
Most users think Lightning Calendar is a great Google Calendar alternative.
Nextcloud Calendar
Is this is a good alternative?
Yes
No
Free • Open Source
Calendar App
Online
Self-Hosted
24 Nextcloud Calendar alternatives
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.
Suggest and vote on features
Nextcloud Calendar Features
1. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
2. Privacy focusedNextcloud Calendar is considered a privacy friendly alternative.
3. Calendar IntegrationNextcloud Calendar lets you sync your tasks and events with your calendar application.
4. Full-Text SearchNextcloud Calendar lets you search for specific words or phrases from inside a document or database.
5. No TrackingNextcloud Calendar will not track you or use your personal data.
6. Calendar ViewNextcloud Calendar has a built-in calendar view to have a clear overview of your content over time.
7. RemindersNextcloud Calendar allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
8. Dark ModeNextcloud Calendar supports dark mode for comfortable usage in low light conditions.
9. SubtasksNextcloud Calendar allows you to create and manage tasks inside of a parent-main task.
Nextcloud integration
CalDAV Support
Support for @mentions
Two-factor Authentication
Real time collaboration
Comments about Nextcloud Calendar as a Alternative to Google Calendar
Almost everyone thinks Nextcloud Calendar is a great Google Calendar alternative.
Guest
Free (and open source) alternative. Your data is yours !
Positive comment •
3
Kontact
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Calendar App
Contact Manager
Linux
113 Kontact alternatives
Personal Information Manager (Mail, Contact, Calendar and more).
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Kontact Features
Google integration
Convert Email to Task
KDE
Feed Reader
Personal Information Manager (PIM)
Contacts
Kolab Community
Is this is a good alternative?
Yes
No
Freemium • Open Source
Linux
Online
Self-Hosted
42 Kolab Community alternatives
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.
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Kolab Community Features
1. Real time collaborationMultiple users can work together in Kolab Community simultaneously.
CalDAV Support
WebDAV Support
IMAP Support
CardDAV Support
Add a screenshot

Opinions about Kolab Community as a Alternative to Google Calendar
Some users think Kolab Community is a great Google Calendar alternative, some don't.
Woelkli
Is this is a good alternative?
Yes
No
Freemium • Open Source
Cloud Storage Service
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
79 Woelkli alternatives
woelkli is a service that provides secure cloud storage hosted in Switzerland. Save, view, edit and share your files from anywhere in the world, from any device
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Woelkli Features
Built-in Calendar
Contacts
Comments about Woelkli as a Alternative to Google Calendar
This alternative is disputed. Woelkli is still a legitimate Google Calendar alternative, but it might have issues that some users think are important.
Guest
It's a cloud storage service...
Negative comment •
4
Kalendar
Is this is a good alternative?
Yes
No
Free • Open Source
Calendar App
Linux
99 Kalendar alternatives
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.
Suggest and vote on features
Kalendar Features
1. Sync with Google CalendarKalendar can be synchronized with Google Calendar
KDE Plasma integration
KDE
Calendar Sync