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TimeTree vs Fossify Calendar: catalog facts
TimeTree	Fossify Calendar
Freemium Free with ads; Premium costs 4.49 USD per month or 44.99 USD per year, varying by region.	Free Free and open source with no ads.
Android, iOS	Android
Multiple shared calendars for different groups Simple invite-based sharing	No ads or tracking Syncs with Google, Outlook, Nextcloud and Exchange calendars
Free version shows ads File attachments and some views require Premium	Android only Sync relies on accounts already set up on the device
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 1, 2026	Official website Full listing and sources Checked October 2, 2026

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