NAS Operating Systems

Every major NAS OS with pros, cons, ideal users, and a detail page when available. Use the OS Wizard to get a personalised recommendation.

Vendor NAS (turnkey hardware + OS)

Synology DSM
Closed source · BTRFS + SHR
The most polished NAS OS. Locked to Synology hardware. Best out-of-the-box ecosystem.
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QNAP QTS / QuTS hero
Closed source · ext4 or ZFS
QTS = traditional RAID. QuTS hero = ZFS variant on higher-end QNAP units.
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UGREEN UGOS
Closed source · BTRFS
New DSM challenger. Hardware-bundled. Polished UI, still maturing feature set.
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Asustor ADM
Closed source
Budget alternative to Synology / QNAP. Smaller ecosystem.
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DIY / community OSes

Unraid
Paid · independent parity
Drive-independent parity. Mixed sizes natural. Excellent Docker / Plex ecosystem.
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TrueNAS SCALE
Free · Linux · ZFS-native
Free, open source, ZFS-native, Docker + KVM apps.
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TrueNAS CORE
Free · FreeBSD · ZFS
FreeBSD-based ZFS NAS. Mature but slower-moving than SCALE.
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HexOS
Paid (~$60/yr) · ZFS underneath
Simplified UI on top of TrueNAS / ZFS. "Easy ZFS for everyone".
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Proxmox VE
Free · Debian · KVM + ZFS
Virtualization-first. Best free hypervisor + ZFS combo for homelab.
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OpenMediaVault
Free · Debian
Debian-based GUI file server. Solid basic NAS for general use.
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