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FreeFileSync vs Syncthing: catalog facts
FreeFileSync	Syncthing
Free Free to download and use; the project runs on advertising and donations. A paid Donation…	Free Free software; the Syncthing Foundation is funded by donations. There is no storage cost…
Windows, macOS, Linux	Windows, macOS, Linux, Command line, Self-hosted
Transfers only the differences between source and target instead of copying everything Saved jobs run unattended in batch mode, suitable for scheduled backups	No central server: none of your data is stored anywhere except on your own computers All traffic is TLS encrypted with perfect forward secrecy, and every device is authenticated by certificate
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	The official Android app was archived in December 2024; Android users rely on a community fork Both devices must be online at the same time for changes to move
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License not stated	License: MPL-2.0
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 20, 2026

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