Etar
Etar is a free, open-source calendar and contacts app for Android. Etar is a material designed open source calendar, for everyone. It has 2,630 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid and Google Play.
github.com/Etar-Group/Etar-Calendar (opens in a new tab)
Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error
About Etar
Features: - Month view. - Week, day and agenda view. - Uses Android calendar storage to show all synchronized calendars. - Material Design. - Dark and light theme. - Support offline calendar. - Agenda widget. - Support sharing calendars via ICS and the ability to import/export from SD card. - Multilingual UI. Bugs and feedback: Source code:
Privacy and F-Droid
F-Droid builds Etar from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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Is Etar free and open source?
Yes. Etar's source code is public on GitHub under the GPL-3.0-only license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Etar?
You can install Etar from F-Droid (package ws.xsoh.etar) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: v1.0.57).
Is Etar still maintained?
The repository's most recent commit was on Oct 26, 2026. Its F-Droid listing was last updated on Jul 31, 2026. appsgit only lists apps whose repository had a commit in the last six months.