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FreeFileSync vs ChronoSync: catalog facts
FreeFileSync	ChronoSync
Free Free to download and use; the project runs on advertising and donations. A paid Donation…	Paid $49.99 with a 15-day trial; a cheaper Express edition is on the App Store and Setapp.
Windows, macOS, Linux	macOS
Transfers only the differences between source and target instead of copying everything Saved jobs run unattended in batch mode, suitable for scheduled backups	Syncs to drives, NAS, other Macs and selected cloud services Can create bootable backups
The installer and the website carry advertising, and the download page pushes donations hard Some conveniences, including parallel file copying, are reserved for the paid Donation Edition	macOS only Paid license, with ChronoAgent sold separately
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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