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Resilio SyncSyncthing
Free

Free for personal use. Business editions are paid.

 Free

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

Windows, macOS, Linux, Android, iOS Windows, macOS, Linux, Command line, Self-hosted
  • Files sync directly between your devices with no cloud storage involved
  • Fast on a local network and works well with very large libraries
  • 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
  • Closed source, so the protocol and crypto cannot be audited
  • Both devices must be online at the same time to sync
  • 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 September 22, 2026

Checked September 20, 2026

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