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Linwood Flow vs Fossify Calendar: catalog facts
Linwood Flow	Fossify Calendar
Free Free and open source under the AGPL 3.0.	Free Free and open source with no ads.
Windows, Linux, Android, Web	Android
You decide where your data is stored Manages events, groups, places and people in one app	No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars
Developers state it is not ready for production use Nightly builds can be unstable	Android only Sync relies on accounts already set up on the device
Downloadable app, Web application	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-only
Not stated if an account is needed	No account needed
Not stated if it works offline	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.