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

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