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Etar vs Google Calendar: catalog facts
Etar	Google Calendar
Free Free and open source.	Free Free with a Google account.
Android	Web
Open source with an active community Clean Material Design interface	Free to use Syncs across devices
Android only Sync depends on the calendar accounts set up on the phone	Requires a Google account Data is stored on Google's servers
Downloadable app	Web application, Hosted service
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.