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

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