Etar Calendar
Etar Calendar: A focused, free Android calendar for offline use and open-source flexibility. Ranked #174 of 193 in Calendar Apps by our editors (3.0/10); pricing: Free plan; best for android users wanting a free open-source calendar.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forAndroid users wanting a free open-source calendar
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
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
Our verdict on Etar Calendar
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).
Your product? Our editors can test Etar Calendar in depth and publish a review, labelled as paid · from $149/mo →
Etar Calendar pricing
Etar Calendar fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Shared calendars | Yes |
| Time blocking | Not verified |
| Scheduling links | Not verified |
| Calendar sync | Not verified |
| Mobile apps | Android |
| Video meeting support | Not verified |
| Deployment | Mobile |
| Platforms | Android |
| Support | Email, Community |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: Google Calendar, Exchange, CalDAV servers |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Etar Calendar integrations
Etar Calendar lists 3 integrations on its own site.
- Google Calendar
- Exchange
- CalDAV servers
Alternatives to Etar Calendar
- Google CalendarA versatile calendar for personal schedules and Google Workspace collaboration.9.4
- Microsoft OutlookA flexible calendar choice for people and teams already working in Microsoft’s ecosystem.9.2
- Zoho CalendarA low-cost calendar with booking, sync, room reservations, and broad integrations.9.1
See all Etar Calendar alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
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