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Synology DiskStation Manager vs Asustor Data Master (ADM): catalog facts
Synology DiskStation Manager	Asustor Data Master (ADM)
Freemium Included with Synology NAS hardware; a few services require separate licenses.	Freemium Included with Asustor NAS hardware; some apps and services are paid add-ons.
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	App Central catalog covers backup, media server, and surveillance add-ons Btrfs snapshot support for point-in-time data protection
Only runs on Synology's own hardware, unlike open NAS operating systems Some advanced features are gated behind specific higher-end models	Only runs on Asustor's own hardware Smaller third-party app ecosystem than QNAP or Synology
Self-hosted	Self-hosted
Closed 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.