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osync vs rsync: catalog facts
osync	rsync
Free Free and open source.	Free Free and open source under the GPL.
Linux, Command line	Windows, macOS, Linux, Command line
Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support	Transfers only the changed parts of files, so repeat syncs are fast Preserves permissions, links and attributes, which makes it safe for system trees
Command-line only, configured through files Needs rsync and a Unix-like shell environment	No versioning or snapshots on its own; --delete destroys without warning Command-line only, with a long list of subtle flags
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.