7 self-hosted options
Open-source alternatives to Google Calendar
The best open-source alternatives to Google Calendar are Radicale, Baïkal and Nextcloud.
About Google Calendar: Google's online calendar with sharing and event invites.
Every option below is free to self-host and ranked by GitHub stars, so you can move off Google Calendar without giving up the features you rely on.
Top picks
- Rank 1:
Radicale
Kozea/Radicale
Simple calendar and contact server with extremely low administrative overhead.
Groupware & CalendarsPython - Rank 2:
Baïkal
sabre-io/Baikal
Lightweight CalDAV and CardDAV server based on sabre/dav.
Groupware & CalendarsPHP - Rank 3:
Nextcloud
nextcloud/server
Access and share your files, calendars, contacts, mail and more from any device, on your terms.
FeaturedFile Sync & StoragePHP
Why switch
Why teams move off Google Calendar
Self-hosting is not only about saving money. These are the reasons people make the switch.
Own your data
Your data lives on a server you control, not on Google Calendar's infrastructure. No surprise policy changes and no lock-in.
No per-seat pricing
Open-source alternatives to Google Calendar are free to run for as many users as your server can handle. A small VPS often costs less than a single subscription.
Customize and extend
Read the code, add plugins, connect it to your own tools and automate it through open APIs. When you need a feature, you can build it or fund it.
Full ranking
All 7 Google Calendar alternatives
Ranked by GitHub stars. Open any app for live stats, license details and a deploy option.
- 1
Radicale
Simple calendar and contact server with extremely low administrative overhead.
Groupware & Calendars - 2
Baïkal
Lightweight CalDAV and CardDAV server based on sabre/dav.
Groupware & Calendars - 3
NextcloudFeatured
Access and share your files, calendars, contacts, mail and more from any device, on your terms.
File Sync & Storage - 4
Davis
A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal.
Groupware & Calendars - 5
SabreDAV
Open source CardDAV, CalDAV, and WebDAV framework and server.
Groupware & Calendars - 6
SOGo
SOGo offers multiple ways to access the calendaring and messaging data. CalDAV, CardDAV, GroupDAV, as well as ActiveSync, including native Outlook compatibility and Web interface.
Groupware & Calendars - 7
Xandikos
Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository.
Groupware & Calendars
What is the best open-source alternative to Google Calendar?
Radicale is the most popular open-source alternative to Google Calendar, with 5,087 GitHub stars. Baïkal and Nextcloud are also strong choices. Compare features, license and recent activity to find the best fit for your team.
Is there a free alternative to Google Calendar?
Yes. All 7 apps on this page are open source and free to self-host, so you can run a Google Calendar replacement without per-user fees. You only pay for the server, and a small VPS is usually enough for personal use or a small team.
Can I self-host an alternative to Google Calendar?
Yes. Each app here runs on your own server. Follow the install steps in the project's README, which usually take a few minutes on a fresh Linux VPS.
How do I migrate from Google Calendar?
Start by exporting your data from Google Calendar, then check the import options of the app you pick, since many projects ship importers for popular formats. Run both side by side for a week before you switch so nothing is lost.