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FreeFileSync vs FolderSync: catalog facts
FreeFileSync	FolderSync
Free Free to download and use; the project runs on advertising and donations. A paid Donation…	Freemium The Android app is free; the desktop app has a 14-day trial.
Windows, macOS, Linux	Windows, macOS, Linux, Android
Transfers only the differences between source and target instead of copying everything Saved jobs run unattended in batch mode, suitable for scheduled backups	Supports more than 20 cloud providers Also syncs with SMB and SFTP targets
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	Desktop version is paid after a 14-day trial Proprietary software
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.