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Unison vs ChronoSync: catalog facts
Unison	ChronoSync
Free The open-source application is available without a license fee.	Paid $49.99 with a 15-day trial; a cheaper Express edition is on the App Store and Setapp.
Windows, macOS, Linux	macOS
Handles updates made independently on both replicas	Syncs to drives, NAS, other Macs and selected cloud services Can create bootable backups
Conflicting edits may require a decision before synchronization.	macOS only Paid license, with ChronoAgent sold separately
Downloadable app	Downloadable app
Open source	Closed 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.