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Agenda Tech vs Etar: catalog facts
Agenda Tech	Etar
Free Free and open source under Apache-2.0.	Free Free and open source.
Android	Android
Encrypted local calendar database Exact reminders with recurring events	Open source with an active community Clean Material Design interface
No calendar sync, sharing or invitations No sync between devices	Android only Sync depends on the calendar accounts set up on the phone
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	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 8, 2026	Official website Full listing and sources Checked September 24, 2026

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