Etar review

Etar is the answer for people who want a calendar app with nothing extra. It is free, open source under GPL-3.0, has no ads, and its Google Play data safety section says it collects and shares no data. It is also listed on F-Droid for people who avoid Google Play. Etar uses Android's calendar sync, so Google Calendar and Exchange accounts set up on the phone appear in its month, week, day and agenda views without another sign-in. You can keep an offline calendar, share calendars as ICS files and import or export from storage, and switch between dark and light themes. The limits follow from its simplicity. There are no tasks, weather, templates or heat maps, and it depends entirely on the phone's account sync, so an Outlook.com account must be synced to Android first. For a clean, private replacement for a manufacturer calendar, it does the job at no cost.

Who it is for

Privacy-minded users who want a plain calendar with no ads or tracking.

Price

Free and open source, no ads.

Free, open source and absolutely no Ads.
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Month, week, day and agenda views
• Uses Android calendar sync for Google Calendar and Exchange
• Offline calendar option
• Share calendars via ICS and import or export files
• Dark and light themes

Strengths and weaknesses

• Strength: Free with no ads and no paid tier
• Strength: GPL-3.0 licensed code on GitHub
• Strength: Play listing says no data is collected or shared
• Weakness: Fewer features than Business Calendar 2 or DigiCal
• Weakness: No built-in tasks or weather
• Weakness: Relies on the phone's account sync for Google and Exchange

Key facts

• Price: Free
• License: GPL-3.0
• Also on: F-Droid
• Ads: None

Where it ranks

Etar is No. 8 in our Best Calendar Apps for Android verdict.