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Syncthing vs Unison: catalog facts
Syncthing	Unison
Free Free software; the Syncthing Foundation is funded by donations. There is no storage cost…	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Command line, Self-hosted	Windows, macOS, Linux
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	Handles updates made independently on both replicas
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	Conflicting edits may require a decision before synchronization.
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: MPL-2.0	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 20, 2026	Official website Full listing and sources Checked September 22, 2026

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