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Agenda Tech vs Fossify Calendar: catalog facts
Agenda Tech	Fossify Calendar
Free Free and open source under Apache-2.0.	Free Free and open source with no ads.
Android	Android
Encrypted local calendar database Exact reminders with recurring events	No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars
No calendar sync, sharing or invitations No sync between devices	Android only Sync relies on accounts already set up on the device
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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