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FreeFileSyncosync
Free

Free to download and use; the project runs on advertising and donations. A paid Donation…

 Free

Free and open source.

Windows, macOS, Linux Linux, Command line
  • Transfers only the differences between source and target instead of copying everything
  • Saved jobs run unattended in batch mode, suitable for scheduled backups
  • Bidirectional sync on top of standard rsync
  • Fault tolerance and POSIX ACL support
  • 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
  • Command-line only, configured through files
  • Needs rsync and a Unix-like shell environment
Downloadable app Downloadable app
Open source Open source
License not stated License not stated
No account needed No account needed
Works offline Works offline

Checked September 20, 2026

Checked September 23, 2026

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