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Etar - OpenSource Calendar

Etar is a material designed open source calendar, for everyone!
New in version 1.0.57
- Add option for staggered display of overlapping events
- Allow any day of the week as the week start day
- Bugfixes
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: https://github.com/Etar-Group/Etar-Calendar/issues
Source code: https://github.com/Etar-Group/Etar-Calendar
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 1.0.57 (57) suggested Added on Jul 31, 2026

    This version requires Android 6.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "systemExempted"
      Allows the app to make use of foreground services with the type "systemExempted"
    • find accounts on the device
      Allows the app to get the list of accounts known by the phone. This may include any accounts created by applications you have installed.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read sync settings
      Allows the app to read the sync settings for an account. For example, this can determine whether the People app is synced with an account.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • ws.xsoh.etar.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 8.8 MiB PGP Signature | Build Log

    • New in version 1.0.56
    - Use SAF to avoid external storage permissions
    - Prevent Etar from overriding external calendar sync settings
    - Add missing channel_ID
    - Bugfixes
  • Version 1.0.56 (56) - Added on Jun 09, 2026

    This version requires Android 6.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "systemExempted"
      Allows the app to make use of foreground services with the type "systemExempted"
    • find accounts on the device
      Allows the app to get the list of accounts known by the phone. This may include any accounts created by applications you have installed.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read sync settings
      Allows the app to read the sync settings for an account. For example, this can determine whether the People app is synced with an account.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • ws.xsoh.etar.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 8.4 MiB PGP Signature | Build Log

    • New in version 1.0.55
    - Revert Load events when scrolling in month view
    - Revert Add stacked events
    - Bugfixes
  • Version 1.0.55 (55) - Added on Apr 21, 2026

    This version requires Android 6.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "systemExempted"
      Allows the app to make use of foreground services with the type "systemExempted"
    • find accounts on the device
      Allows the app to get the list of accounts known by the phone. This may include any accounts created by applications you have installed.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read sync settings
      Allows the app to read the sync settings for an account. For example, this can determine whether the People app is synced with an account.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • toggle sync on and off
      Allows an app to modify the sync settings for an account. For example, this can be used to enable sync of the People app with an account.
    • ws.xsoh.etar.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 8.4 MiB PGP Signature | Build Log

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