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Fossify Calendar vs TimeTree: catalog facts
Fossify Calendar	TimeTree
Free Free and open source with no ads.	Freemium Free with ads; Premium costs 4.49 USD per month or 44.99 USD per year, varying by region.
Android	Android, iOS
No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars	Multiple shared calendars for different groups Simple invite-based sharing
Android only Sync relies on accounts already set up on the device	Free version shows ads File attachments and some views require Premium
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License not stated
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 1, 2026

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