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Unison vs osync: catalog facts
Unison	osync
Free The open-source application is available without a license fee.	Free Free and open source.
Windows, macOS, Linux	Linux, Command line
Handles updates made independently on both replicas	Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support
Conflicting edits may require a decision before synchronization.	Command-line only, configured through files Needs rsync and a Unix-like shell environment
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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