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Syncthing vs Seafile: catalog facts
Syncthing	Seafile
Free Free software; the Syncthing Foundation is funded by donations. There is no storage cost…	Freemium The community edition is free and open source. The Professional edition is paid.
Windows, macOS, Linux, Command line, Self-hosted	Windows, macOS, Linux, Android, iOS, Self-hosted
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	Block-level sync and deduplication make it fast with large libraries Per-library client-side encryption, and a drive client that streams on demand
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	Some features are reserved for the paid Professional edition Self-hosting requires a database and careful upgrade handling
Downloadable app, Self-hosted	Self-hosted, Downloadable app
Open source	Open source
License: MPL-2.0	License not stated
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.