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Syncthing vs osync: catalog facts
Syncthing	osync
Free Free software; the Syncthing Foundation is funded by donations. There is no storage cost…	Free Free and open source.
Windows, macOS, Linux, Command line, Self-hosted	Linux, Command line
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	Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support
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	Command-line only, configured through files Needs rsync and a Unix-like shell environment
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: MPL-2.0	License not stated
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 23, 2026

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