What is Etar?
Etar is a free, open-source calendar app for Android, built as an enhanced version of the calendar from the Android Open Source Project. It uses Android's calendar storage, so it shows any calendar that another app or account syncs to the phone, and it can also keep an offline calendar that stays on the device. The app offers month, week, day and agenda views in light and dark themes. It is licensed under the GPLv3 and distributed through F-Droid.
Etar is free to use. See every plan
Good for
- Android users who want a plain calendar with open source code
- People who sync a self-hosted CalDAV server through DAVx5
- Keeping an offline calendar that stays on the phone
Worth knowing
- Android only; the F-Droid build of version 1.0.57 requires Android 6.0 or newer.
- No CalDAV client is included. Syncing a calendar with a server needs another app, such as DAVx5.
- The project describes its ICS import as unstable and advises caution if your provider sends invitation emails automatically.
- The Google Play link in the project's README returned a Not Found page on the check date; F-Droid carries the current version.
Key features
- Month, week, day and agenda views
- Four views in a Material Design interface with dark and light themes. Recent versions let the week start on any day and can stagger overlapping events.
- Works with any Android calendar provider
- Etar reads Android's calendar storage, so it shows every calendar synced to the phone. You choose which ones are displayed and which one new events go to.
- Offline calendars
- A calendar can be created that is stored on the phone only and never synced to a server.
- ICS sharing, import and export
- Calendars can be shared as ICS files and imported or exported from storage, including invitations received by email. The project warns that import has known bugs.
- Agenda widget
- A home screen widget lists upcoming events in agenda form. The interface is translated into many languages by volunteers.
Etar pricing
- Starts at
- Free
- Free plan
- Free and open source under the GPLv3. The app is installed from F-Droid or built from the source on GitHub, and the project lists no paid version.
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Etar | $0 | The complete app, built and signed by F-Droid from the public source code. Version 1.0.57 requires Android 6.0 or newer. |
Read from github.com on Oct 9, 2026. Prices change, so confirm with Etar before you buy.
Works with
- DAVx5
- Google Calendar
Etar alternatives
- Etar vs Google Calendar
Free plan · from $7/mo
- Etar vs aCalendar
Free plan · from $2.49 one-time
- Etar vs Proton Calendar
Free plan · from $3.99/mo
- Etar vs Tuta Calendar
Free plan · from €3/mo
Common questions
Is Etar free?
Yes. Etar is free to use. Free and open source under the GPLv3. The app is installed from F-Droid or built from the source on GitHub, and the project lists no paid version.
How much does Etar cost?
Etar lists one plan. Etar: $0. Prices were read from github.com on Oct 9, 2026.
What platforms does Etar work on?
Etar is available on Android.
Does Etar have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Etar is listed for Android.
Does Etar have a Windows app?
No Windows app was listed when its pages were read on Oct 9, 2026. Etar is listed for Android.
Is Etar open source?
Yes. Etar is open source, according to its own site.
Does Etar work offline?
Yes, according to its own site. What works without a connection differs by plan and platform, so check the vendor's page for the detail.
What does Etar integrate with?
Etar's listing names DAVx5 and Google Calendar. A listing names up to eight integrations, so it may connect to more.
Who makes Etar?
Etar is made by The Etar Project.
What are the alternatives to Etar?
The closest alternatives to Etar in our directory are Fossify Calendar, Google Calendar, aCalendar, Proton Calendar and Tuta Calendar. Each one has a side-by-side comparison with Etar.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 9, 2026.