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Nextcloud vs Sync-in: catalog facts
Nextcloud	Sync-in
Freemium The server and clients are free and open source. Nextcloud GmbH sells enterprise support…	Free Free and open source, with optional paid enterprise support.
Windows, macOS, Linux, Android, iOS, Self-hosted, Web	Web, Self-hosted
Your storage limit is your own disk, and your data never leaves it Desktop client supports virtual files, so a big library costs no local space	Files remain readable on disk outside the application Consistent permissions across web, WebDAV, sync and API
You run the server, which means updates, backups and certificates are yours Major version upgrades are known for needing careful reading	You run and maintain the server yourself Younger project than Nextcloud or Seafile
Self-hosted, Downloadable app	Self-hosted
Open source	Open source
License: GPL-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 21, 2026	Official website Full listing and sources Checked October 2, 2026

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