Compare software

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