A NAS that depends on a vendor cloud is one outage away from being unreachable. HexOS recently shipped local management without the cloud round-trip, which puts pressure on every other NAS OS to prove it can run cleanly when the WAN goes dark. We picked eight platforms that run on commodity hardware, manage drives, share files, and let you bolt on apps. Some are friendlier than Synology, some are closer to bare Linux. We rank them by who the platform actually fits, not by feature count.
What to look for in a NAS management app
Hardware compatibility matters first. ZFS, btrfs, and parity arrays all want different things from your drives, and a system that only supports off-the-shelf NAS appliances rules out most homelab builds. Bare-metal install vs hypervisor matters too. Some platforms expect the whole machine; others run as a VM under Proxmox or ESXi.
Beyond storage, look at the app ecosystem. Docker support is table stakes. A built-in store with Jellyfin, Nextcloud, Home Assistant, and the *arr stack saves hours. Remote access matters: WireGuard, Tailscale, or vendor-tunnel options should be present without requiring port forwarding. Finally, the UI sets the daily-use ceiling. A NAS you check twice a year needs zero polish; one you tune every weekend rewards a clean dashboard.
Quick comparison
| App | Best for | Platforms | Free plan | Starting price | Rating |
|---|---|---|---|---|---|
| HexOS | Simple TrueNAS deployment | Windows, Linux (server install) | Trial period | $199 one-time | New product |
| TrueNAS Scale | ZFS purists | Linux (server install) | Yes | $0 | 4.6 community |
| Unraid | Mixed-drive arrays | Linux (server install) | 30-day trial | $49 starter | 4.7 forums |
| OpenMediaVault | Debian veterans | Linux (server install) | Yes | $0 | 4.4 community |
| Synology DSM | First-time NAS owners | Synology hardware | With device | DSM included | 4.5 |
| CasaOS | App-store-first homelabs | Linux (any distro) | Yes | $0 | 4.5 GitHub |
| Umbrel | Self-hosted SaaS converts | Linux, Umbrel Home | Yes | $0 OS | 4.3 |
| Proxmox VE | Power users running VMs and storage | Linux (bare-metal) | Yes | $0 | 4.7 |
The apps
1. HexOS — Best for getting TrueNAS running without the manual
HexOS sits on top of TrueNAS Scale and removes the steps that send beginners back to YouTube. Setup runs through a web wizard that handles pool layout, share creation, and remote access. The recent update moved core management off the HexOS cloud so the dashboard keeps working when the WAN drops, which closes the most common complaint from launch.
Where it falls short: Locks you to its preferred TrueNAS configuration. If you outgrow the assistant, you fall back to raw TrueNAS anyway. The one-time license is steep next to free competitors.
Pricing:
- Free: Trial period to test
- Paid: One-time license around $199 for lifetime use
Platforms: Windows or Linux for installation media. Runs on Linux server hardware after install.
Download: hexos.com
Bottom line: Pay for HexOS if you want a Synology-like onboarding without buying Synology hardware. Skip if you already enjoy editing YAML.
2. TrueNAS Scale — Best free NAS for ZFS
TrueNAS Scale is the open-source rewrite of TrueNAS on Linux. ZFS handles snapshots, replication, and bit-rot protection out of the box. The 24.10 series added a polished apps catalogue based on Helm charts, so Nextcloud, Plex, and Immich are a couple of clicks away rather than a Docker compose file.
Where it falls short: ZFS expects matching disks per VDEV. Mixing drive sizes wastes capacity. The UI is dense, and the apps catalogue still trails Unraid’s community store on niche tools.
Pricing:
- Free: Yes, fully featured
- Paid: TrueNAS Enterprise via iXsystems for businesses, with paid support
Platforms: Bare-metal Linux install or hypervisor VM.
Download: truenas.com
Bottom line: Pick TrueNAS Scale if storage integrity is the top priority and you can plan drive purchases around VDEV layouts.
3. Unraid — Best for adding drives one at a time
Unraid uses a parity-based array instead of ZFS, which means you can throw in mismatched drives and grow the pool a disk at a time. The community apps store carries thousands of Docker templates with sensible defaults, and the VM manager handles GPU passthrough cleanly for gaming or AI workloads. Version 7 added native ZFS as an option for pools that need it.
Where it falls short: Single-parity reads run at single-disk speed, which hurts heavy media work. The license tiers cap drive counts, so a 30-drive build means buying the top tier.
Pricing:
- Free: 30-day trial
- Paid: Starter $49, Unleashed $109, Lifetime $249
Platforms: Bare-metal Linux. Boots from USB.
Download: unraid.net
Bottom line: Unraid is the answer when you have a closet of recycled drives and want every byte usable. Skip it if performance per disk matters more than capacity.
4. OpenMediaVault — Best free NAS on Debian
OpenMediaVault is a Debian-based NAS distribution that puts a web UI in front of standard Linux services: SMB, NFS, rsync, SnapRAID. Plugins layer on Docker, ZFS, and remote backup. Because the underlying OS is plain Debian, anything that runs on Debian runs here.
Where it falls short: The UI is functional rather than polished. The plugin system can break across major version upgrades. You’re closer to bare Linux than other options, which cuts both ways.
Pricing:
- Free: Yes
- Paid: None
Platforms: Bare-metal Linux. Often paired with a Raspberry Pi for low-power use.
Download: openmediavault.org
Bottom line: Pick OMV when you want a NAS UI without giving up the Debian package manager. Avoid if a one-click app store matters.
5. Synology DSM — Best onboarding for first-time NAS owners
Synology DSM ships on Synology hardware and remains the most polished consumer NAS experience. Photos, Drive, Surveillance Station, and Hyper Backup all integrate cleanly. DSM 7.2 introduced active-active high availability for paid customers, which closes a long-standing gap.
Where it falls short: Locked to Synology hardware. Recent drive-compatibility policies push owners toward Synology-branded disks at a premium. CPU and RAM are weaker than equivalently priced DIY builds.
Pricing:
- Free: Comes with Synology hardware
- Paid: Hardware-bundled, no separate OS fee
Platforms: Synology hardware only (uses Linux internally).
Download: synology.com
Bottom line: Worth the markup if you want a NAS the same way you want a router, plug it in and never think about it. Not for tinkerers.
6. CasaOS — Best NAS dashboard for app-store fans
CasaOS is closer to a homelab dashboard than a storage OS. It runs on top of any Debian-based system and gives you a friendly app store of Docker containers, plus simple SMB and file management. The Apple-flavoured UI is the friendliest in this list.
Where it falls short: Storage features are basic. There’s no native ZFS or parity protection, so you bring your own RAID strategy. Treat it as a Docker launcher with file sharing attached.
Pricing:
- Free: Yes
- Paid: None
Platforms: Installs on any Debian-based Linux (Ubuntu, Debian, Raspberry Pi OS).
Download: casaos.io
Bottom line: Great pick for a Pi-class home server or a single-drive media box. Reach for TrueNAS or Unraid when storage layout matters.
7. Umbrel — Best for self-hosted SaaS replacements
Umbrel started as a Bitcoin node OS and grew into a homelab platform with a curated app store. Nextcloud, Bitwarden, Immich, Home Assistant, and dozens of *arr-stack tools install in a couple of clicks. The Umbrel Home is a turnkey appliance for people who want zero Linux exposure.
Where it falls short: Storage is a single mount point. Multi-disk setups still want Unraid or TrueNAS underneath. Some advanced settings live behind SSH, not the UI.
Pricing:
- Free: Umbrel OS for DIY hardware
- Paid: Umbrel Home hardware starts around $399
Platforms: Linux (Raspberry Pi 4/5, x86 mini-PCs), or pre-built Umbrel Home.
Download: umbrel.com
Bottom line: The smoothest path to a personal Vercel-like dashboard of self-hosted services. Pair with bigger storage from somewhere else.
8. Proxmox VE — Best for storage plus virtualization
Proxmox VE is a Debian-based hypervisor that also covers storage. Its ZFS support, LXC container layer, and built-in backup server give you a NAS, a VM host, and a homelab on one box. Many setups run TrueNAS or OMV inside Proxmox to combine UI polish with hypervisor flexibility.
Where it falls short: Storage UI is more “configurable” than “friendly.” The web dashboard expects you to know your way around iSCSI, LVM-thin, and ZFS pools. There’s no consumer app store.
Pricing:
- Free: Yes (community repository)
- Paid: Enterprise subscription from around €115/year per CPU
Platforms: Bare-metal Linux.
Download: proxmox.com
Bottom line: Pick Proxmox when storage is one of several jobs the box needs to do. Pair it with TrueNAS Scale as a VM for ZFS-grade storage management.
How to pick the right one
- If you want a Synology without buying Synology: HexOS.
- If you want ZFS done right and free: TrueNAS Scale.
- If you have mismatched drives: Unraid.
- If you live in Debian: OpenMediaVault.
- If you want zero tinkering: Synology DSM.
- If you want Docker apps on a Pi: CasaOS.
- If self-hosting Bitwarden, Immich, and Nextcloud is the point: Umbrel.
- If the box has to run VMs too: Proxmox, with TrueNAS Scale as a guest.
If you’re brand new to NAS work, start with Synology DSM hardware or CasaOS on a Raspberry Pi 5, then graduate. If you’ve already used Docker on a Linux server for a year, jump straight to TrueNAS Scale or Unraid.
FAQ
What is the best free NAS OS for home use? TrueNAS Scale and OpenMediaVault are the two strongest free options. TrueNAS wins on data integrity thanks to ZFS. OMV wins on hardware flexibility and Debian familiarity.
Is HexOS worth the license fee? HexOS is worth paying for if the alternative is giving up on the project. The license covers the setup wizard and the management UI on top of TrueNAS. People who already enjoy TrueNAS’s own UI gain less.
Can I run Plex, Jellyfin, and Home Assistant on these? Yes. Every option in this list supports Docker. TrueNAS Scale, Unraid, CasaOS, and Umbrel ship app stores that install these in a couple of clicks.
What is the difference between Unraid and TrueNAS? Unraid uses a parity-based array that accepts mismatched drives and grows one disk at a time. TrueNAS uses ZFS, which requires matching drives per VDEV but offers stronger data integrity and snapshots.
Do any of these work without a cloud account? Yes. TrueNAS, OpenMediaVault, CasaOS, Umbrel, and Proxmox run fully locally. HexOS recently moved core management off its cloud. Synology DSM works locally but pushes you toward QuickConnect for remote access.
