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Syncthing vs QNAP Qsync: catalog facts
Syncthing	QNAP Qsync
Free Free software; the Syncthing Foundation is funded by donations. There is no storage cost…	Free Provided by QNAP for use with its NAS devices, which must be bought separately.
Windows, macOS, Linux, Command line, Self-hosted	Windows, macOS
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	Real-time sync across computers, mobile devices and the NAS Keeps files on your own hardware instead of a public cloud
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	Requires a QNAP NAS Mac backup is still in beta
Downloadable app, Self-hosted	Downloadable app
Open source	Closed source
License: MPL-2.0	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 October 1, 2026

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