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csync2 vs osync: catalog facts
csync2	osync
Free Free and open source.	Free Free and open source.
Linux, Command line	Linux, Command line
Synchronizes files across many hosts at once Tracks file state in a database to detect conflicts	Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support
Aimed at server clusters, not desktop users Command-line and config file only	Command-line only, configured through files Needs rsync and a Unix-like shell environment
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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