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