Etar is a free and open-source calendar app for Android. It helps you create and check events, appointments, birthdays, reminders, and other plans from your phone. Google Play lists it as an open-source calendar with month, week, day, and agenda views.
The app uses Android’s calendar storage, so it can show calendars that are already synced to the phone. It can work with services such as Google Calendar and Exchange when those calendars are available through Android’s calendar system.
Etar also supports offline calendar use. This is useful when you want to check your saved events without keeping an internet connection active.
Size, Storage, and Competitors
The current F-Droid build, version 1.0.56, has an 8.4 MiB APK download size. The actual storage used after installation can be higher because Android keeps app data and calendar information on the phone.
Etar can work offline and does not need a separate cloud account just to display local calendar data. Its main competitors include Google Calendar and Fossify Calendar. Google Calendar offers wider links with Google’s services, while Fossify Calendar is also free and open source and adds tools such as customizable widgets and different calendar views.
Etar is a good fit for users who want a simple calendar without ads. It also supports importing and exporting calendars through ICS files, which gives users a way to move calendar data.
Useful Features
- Month View: Etar gives you a full month view for checking upcoming events. This makes it easy to see busy and free days at a glance.
- Week and Day Views: You can switch from the month view to week or day views. These views help when you need to check the exact time of an event.
- Agenda View: The agenda view shows your events in a list. It is useful when you want to read your upcoming plans one after another.
- Calendar Import and Export: Etar supports sharing calendars through ICS files and importing or exporting them from storage. This can help when moving calendar information between apps.
- Home Screen Widget: Etar includes an agenda widget for the Android home screen. You can check upcoming events without opening the full calendar app.
Testing Experience
For a Redmi Android test, the useful checks are opening the calendar, changing between month and week views, scrolling through dates, and opening saved events. The current public information confirms recent bug fixes, but it does not provide measured Redmi results for touch response, battery loss, heating, or crashes.
The latest F-Droid release was added on June 9, 2026. Version 1.0.56 includes bug fixes and changes to how external storage permissions are handled.
Because exact battery and temperature figures depend on the phone, Android version, number of events, and sync settings, I would not give made-up numbers for a two-day test. The available version information does show that the project is still receiving maintenance.
Permissions & Safety
Etar’s current F-Droid permission list includes access to calendar events, contacts, accounts, notifications, network information, startup, sync settings, vibration, and scheduled actions. It can also ask to ignore battery optimizations and can add or modify calendar events.
The latest version uses Android’s Storage Access Framework to avoid external storage permissions. This is a change noted in version 1.0.56.
Google Play lists Etar as free and open source, with no ads. Its Play Store page currently shows 50K+ downloads and a 3.8-star rating from 873 reviews.
Pros & Cons
Pros
- Free and open source.
- No ads.
- Supports offline calendars.
- Several calendar views.
- Supports ICS import and export.
Cons
- Some permissions may look broad to new users.
- It has fewer online features than Google Calendar.
- The Play Store has a smaller user base.
- Advanced calendar services may need another sync tool.
Target Audience
Who Should Download:
- People who want a free, open-source calendar.
- Users who need a simple offline calendar with several views.
Who Should Avoid:
- People who depend heavily on Google’s connected calendar services.
- Users who want a calendar with many built-in productivity tools.
FAQs
Can Etar work without internet?
Yes, Etar supports offline calendar use. You can view calendar information stored on the device without keeping an internet connection active.
Is Etar free?
Yes, Etar is free and open-source software. The Google Play listing also says it has no ads.
Can Etar show my Google Calendar events?
Yes, Etar uses Android calendar storage and can show synchronized calendars available through the phone. Google Calendar and Exchange calendars can therefore appear when they are synced to Android’s calendar system.
Offzack Verdict
Etar is a small calendar app with useful daily views, offline support, an agenda widget, and ICS import and export. It is a good option for Android users who want a free, open-source calendar without ads.
Download Etar App from Google Playstore
Final Scorecard
- Ease of Use: ★★★★☆ (4/5) — The month, week, day, and agenda views make basic calendar work easy.
- Performance: ★★★★☆ (4/5) — The app has a small 8.4 MiB package and continues to receive bug fixes.
- Features: ★★★★☆ (4/5) — It includes multiple views, offline use, widgets, and ICS tools.
- Privacy & Safety: ★★★★☆ (4/5) — It is open source, free of ads, and uses Android calendar storage, though it needs several calendar-related permissions.
- Value for Money: ★★★★★ (5/5) — The app is free and provides the main calendar tools without a paid plan.
- Overall Rating: ★★★★☆ (4/5) — Etar is a practical choice for people who want a simple and open-source Android calendar.