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QNAP QsyncSyncthing
Free

Provided by QNAP for use with its NAS devices, which must be bought separately.

 Free

Free software; the Syncthing Foundation is funded by donations. There is no storage cost…

Windows, macOS Windows, macOS, Linux, Command line, Self-hosted
  • Real-time sync across computers, mobile devices and the NAS
  • Keeps files on your own hardware instead of a public cloud
  • 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
  • Requires a QNAP NAS
  • Mac backup is still in beta
  • 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
Closed source Open source
License not stated License: MPL-2.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 20, 2026

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