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Fossify Contacts vs BusyContacts: catalog facts
Fossify Contacts	BusyContacts
Free Free and open source under the GPL-3.0 licence.	Paid Costs $49.99 USD with a 14-day free trial; also available through Setapp.
Android	macOS
No ads, tracking libraries or unnecessary permissions Groups and favorites with batch email or SMS to a group	Direct sync with iCloud, Google, Exchange and CardDAV Tags, smart filters and per-contact activity history
Android only Focused on local contact management rather than its own sync service	macOS only One-time paid purchase after the trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	No account 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.