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Unison vs csync2: catalog facts
Unison	csync2
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	Synchronizes files across many hosts at once Tracks file state in a database to detect conflicts
Conflicting edits may require a decision before synchronization.	Aimed at server clusters, not desktop users Command-line and config file only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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