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

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