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

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