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Fossify Calendar vs Google Calendar: catalog facts
Fossify Calendar	Google Calendar
Free Free and open source with no ads.	Free Free with a Google account.
Android	Web
No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars	Free to use Syncs across devices
Android only Sync relies on accounts already set up on the device	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-only	License not stated
No account needed	Account 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 23, 2026

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