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Etar vs Linwood Flow: catalog facts
Etar	Linwood Flow
Free Free and open source.	Free Free and open source under the AGPL 3.0.
Android	Windows, Linux, Android, Web
Open source with an active community Clean Material Design interface	You decide where your data is stored Manages events, groups, places and people in one app
Android only Sync depends on the calendar accounts set up on the phone	Developers state it is not ready for production use Nightly builds can be unstable
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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