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Sync-in vs Seafile: catalog facts
Sync-in	Seafile
Free Free and open source, with optional paid enterprise support.	Freemium The community edition is free and open source. The Professional edition is paid.
Web, Self-hosted	Windows, macOS, Linux, Android, iOS, Self-hosted
Files remain readable on disk outside the application Consistent permissions across web, WebDAV, sync and API	Block-level sync and deduplication make it fast with large libraries Per-library client-side encryption, and a drive client that streams on demand
You run and maintain the server yourself Younger project than Nextcloud or Seafile	Some features are reserved for the paid Professional edition Self-hosting requires a database and careful upgrade handling
Self-hosted	Self-hosted, Downloadable app
Open 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 2, 2026	Official website Full listing and sources Checked September 22, 2026

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