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Unison vs Syncthing: catalog facts
Unison	Syncthing
Free The open-source application is available without a license fee.	Free Free software; the Syncthing Foundation is funded by donations. There is no storage cost…
Windows, macOS, Linux	Windows, macOS, Linux, Command line, Self-hosted
Handles updates made independently on both replicas	No central server: none of your data is stored anywhere except on your own computers All traffic is TLS encrypted with perfect forward secrecy, and every device is authenticated by certificate
Conflicting edits may require a decision before synchronization.	The official Android app was archived in December 2024; Android users rely on a community fork Both devices must be online at the same time for changes to move
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0	License: MPL-2.0
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 20, 2026

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