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Seafile vs QNAP Qsync: catalog facts
Seafile	QNAP Qsync
Freemium The community edition is free and open source. The Professional edition is paid.	Free Provided by QNAP for use with its NAS devices, which must be bought separately.
Windows, macOS, Linux, Android, iOS, Self-hosted	Windows, macOS
Block-level sync and deduplication make it fast with large libraries Per-library client-side encryption, and a drive client that streams on demand	Real-time sync across computers, mobile devices and the NAS Keeps files on your own hardware instead of a public cloud
Some features are reserved for the paid Professional edition Self-hosting requires a database and careful upgrade handling	Requires a QNAP NAS Mac backup is still in beta
Self-hosted, Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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