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Etar vs Fossify Calendar: catalog facts
Etar	Fossify Calendar
Free Free and open source.	Free Free and open source with no ads.
Android	Android
Open source with an active community Clean Material Design interface	No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars
Android only Sync depends on the calendar accounts set up on the phone	Android only Sync relies on accounts already set up on the device
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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