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