Etar vs Fossify Calendar

Etar

• 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

Fossify Calendar

• Android users who want a calendar without ads, tracking or sign-up
• People who prefer open-source apps installed from F-Droid
• Keeping a private, local calendar that never leaves the phone

Etar

• 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.

Fossify Calendar

• Android only; the Fossify project lists Android as its sole platform.
• The app has no sync service or cloud account of its own. Syncing depends on accounts or calendar providers configured on the device.
• Development is funded by donations, and help comes through a public issue tracker and community channels.
• Google Play and F-Droid publish releases on their own schedules, so versions can differ between stores.

Etar

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.

Fossify Calendar

Five calendar views

Day, week, month, year and event-list views, with event filters to narrow what is shown and controls for color, theme and display.

Recurring events and reminders

Events take times, durations, reminders and advanced repetition rules. Reminder sounds, looping audio and vibration can be customized.

Sync through device accounts

Calendar data can sync through accounts or calendar providers set up on the device, such as Google Calendar, Outlook, Nextcloud or Exchange. Fossify runs no sync service of its own.

Import and export

Calendars can be imported from and exported to files, which keeps the data portable and gives a way to back it up or move it to another app.

Holidays, birthdays and anniversaries

Holidays can be imported, and birthdays and anniversaries can be drawn from the phone's contacts if contacts access is granted.

No Internet permission

The app does not request Android's Internet permission, contains no advertising and sends no app data or usage records to Fossify.

Etar

• 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.

Fossify Calendar

• Fossify Calendar$0

  The complete app, installed from Google Play or F-Droid, with no ads or in-app purchases. Donations are optional.