Etar Calendar review
A focused, free Android calendar for offline use and open-source flexibility.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Etar Calendar is a free, open-source Android calendar application based on AOSP Calendar. It is designed for Android users who want core calendar views, offline calendar support, and control over how calendar data is handled. The app includes month, week, day, and agenda views, plus an agenda widget, dark and light themes, and a multilingual interface. Events are created through Android’s calendar provider system, while calendars can be shared through ICS files.
The published Free plan includes open-source software, no advertisements, Android calendar synchronization, and offline calendar support. Etar works with Android calendar providers and can synchronize with Google Calendar and Exchange through the Android calendar storage system. It also supports two-way calendar synchronization, while CalDAV connections can be handled through a separate Android application such as DAVx5. That makes Etar a practical fit for users whose calendars already connect through Android providers or who are comfortable adding a dedicated synchronization layer.
Etar’s focus is narrower than calendar products built around booking workflows, time blocking, or video meetings. Its Android-only availability also limits its fit for households or teams that need a shared experience across multiple operating systems. ICS sharing and import/export provide useful portability, but the documented instability of ICS import is a consideration for migration workflows. Choose Etar for a straightforward, open-source Android calendar with offline support and standard calendar synchronization. Consider an alternative if you need built-in CalDAV synchronization, broader platform coverage, or advanced scheduling features.
Questions about Etar Calendar
What does Etar Calendar run on? Android. It runs as a mobile app.
What does Etar Calendar integrate with? 3 integrations: Google Calendar, Exchange and CalDAV servers.
Who is Etar Calendar built for? Solo users and small businesses (our editorial estimate).
Etar Calendar pros and cons
- Where it wins
- Free, open-source app with no advertisements
- Month, week, day, and agenda views with an agenda widget
- Offline calendars, ICS sharing, and import/export support
- Where it doesn't
- Android-only platform coverage
- CalDAV requires a separate app such as DAVx5
- ICS import is documented as unstable
Etar Calendar fact sheet, pricing and score →
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