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Fossify Calendar vs Linwood Flow: catalog facts
Fossify Calendar	Linwood Flow
Free Free and open source with no ads.	Free Free and open source under the AGPL 3.0.
Android	Windows, Linux, Android, Web
No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars	You decide where your data is stored Manages events, groups, places and people in one app
Android only Sync relies on accounts already set up on the device	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-only	License: AGPL-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 2, 2026	Official website Full listing and sources Checked October 2, 2026

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