Compare software

QNAP Qsync vs Seafile: catalog facts
QNAP Qsync	Seafile
Free Provided by QNAP for use with its NAS devices, which must be bought separately.	Freemium The community edition is free and open source. The Professional edition is paid.
Windows, macOS	Windows, macOS, Linux, Android, iOS, Self-hosted
Real-time sync across computers, mobile devices and the NAS Keeps files on your own hardware instead of a public cloud	Block-level sync and deduplication make it fast with large libraries Per-library client-side encryption, and a drive client that streams on demand
Requires a QNAP NAS Mac backup is still in beta	Some features are reserved for the paid Professional edition Self-hosting requires a database and careful upgrade handling
Downloadable app	Self-hosted, Downloadable app
Closed source	Open 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 October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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