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osync vs Unison: catalog facts
osync	Unison
Free Free and open source.	Free The open-source application is available without a license fee.
Linux, Command line	Windows, macOS, Linux
Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support	Handles updates made independently on both replicas
Command-line only, configured through files Needs rsync and a Unix-like shell environment	Conflicting edits may require a decision before synchronization.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
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 23, 2026	Official website Full listing and sources Checked September 22, 2026

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