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Rockstor vs Synology DiskStation Manager: catalog facts
Rockstor	Synology DiskStation Manager
Free Open source; the project also offers commercial support options.	Freemium Included with Synology NAS hardware; a few services require separate licenses.
Linux, Self-hosted	Linux, Self-hosted
Multi-arch and Btrfs-based, giving snapshot and replication features without proprietary lock-in Application framework lets users extend the NAS with additional services	Polished, consistent web interface across the entire Synology hardware lineup Large package center covering backup, media, sync, and surveillance apps
Smaller community and plugin ecosystem than TrueNAS or OpenMediaVault Btrfs still requires more care around RAID levels than mature ZFS setups	Only runs on Synology's own hardware, unlike open NAS operating systems Some advanced features are gated behind specific higher-end models
Self-hosted, Downloadable app	Self-hosted
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 September 22, 2026

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