The XDA piece on ZimaOS and FygoOS made a point the OpenMediaVault forum has been dancing around for a year: the DIY NAS market is no longer a two-horse race. OpenMediaVault (OMV) is still a solid Debian-based option, but users who set one up expecting the polish of a newer OS run into the OMV6-to-OMV7 upgrade path, a plugin ecosystem where third-party repos do most of the heavy lifting, and a UI that looks like the mid-2010s. Seven OpenMediaVault alternatives we tested, ranked by how well each fills the gaps.
Why people look past OpenMediaVault in 2026
The r/selfhosted and OMV forum threads keep raising the same complaints:
- The default install has almost nothing. Docker, ZFS, backup targets, and even a proper file browser all live in
omv-extrasor third-party plugins, and the upgrade cadence between OMV, omv-extras, and any given plugin does not always line up. - The web UI is functional but dated. Multi-user setups, snapshot browsing, and disk health require jumping between menus.
- No parity-based array. OMV supports mdadm, snapraid, and ZFS via plugins, but none is the default, and users coming from Synology or Unraid expect a first-class parity story.
- Container UX is minimal. Portainer works, but there is no curated app store the way ZimaOS, CasaOS, and TrueNAS Scale ship one.
- Debian upgrades can bite. Major-version transitions occasionally strand plugins for weeks.
None of this makes OMV a bad pick. Every alternative below plugs at least one of those gaps.
Quick comparison table
| App | Best for | Free plan | Starting price | Standout feature |
|---|---|---|---|---|
| TrueNAS Scale | ZFS at scale | Yes | Free | First-class ZFS, apps, replication |
| Unraid | Mixed-drive parity | 30-day trial | $49 basic license | Add any drive, keep the array |
| ZimaOS | Mini-PC home lab | Yes | Free | Container-first UI, tiny footprint |
| CasaOS | Beginner Docker box | Yes | Free | App store, one-hour setup |
| Proxmox VE | Virtualization + storage | Yes | Free (paid support) | KVM, LXC, ZFS in one shell |
| Rockstor | BTRFS-native NAS | 45-day trial | $199/yr Rock-ons + support | BTRFS snapshots done right |
| Ubuntu Server + Cockpit | Rolling your own | Yes | Free | Familiar Debian tooling, Cockpit UI |
The alternatives
TrueNAS Scale — Best for ZFS-first builds
TrueNAS Scale is the community and iXsystems flagship for anyone whose starting point is “I want ZFS”. It handles replication, snapshots, dataset quotas, and SMB/NFS the way OMV wishes it did out of the box. The apps layer runs on Kubernetes under the hood, with a curated catalogue that has grown steadily.
Where it falls short: ZFS is memory-hungry. A 4 GB Celeron NAS that runs OMV happily struggles with TrueNAS Scale at any meaningful array size. The Kubernetes apps also churn more than plain Docker.
Pricing:
- Free: Full-featured, open source.
- Paid: Enterprise licensing through iXsystems for support and hardware.
- vs OpenMediaVault: Free like OMV, but pulls the ZFS and apps stories from the plugin layer into the base OS.
Migrating from OMV: Data on ext4 or mdadm arrays needs to be copied off before importing into a ZFS pool, since TrueNAS does not import mdadm. SMB share definitions are quick to rebuild.
Download: TrueNAS Scale
Bottom line: Pick TrueNAS Scale if the array is 8 GB of RAM or more and ZFS is non-negotiable.
Unraid — Best for mixed-drive parity
Unraid is the answer for anyone with a pile of mismatched drives. Its parity model tolerates different sizes and lets the array grow one drive at a time. The Community Applications plugin is the biggest third-party store in the NAS space, and Docker and VM management sit in the same UI.
Where it falls short: Not open source, not free. Also single-drive parity by default (dual parity is available), which means the failure story is bounded.
Pricing:
- Free: 30-day trial.
- Paid: Basic $49 (six devices), Plus $89, Pro $129, or $249 lifetime unlimited.
- vs OpenMediaVault: Costs money where OMV does not, but the parity story and app catalogue justify it for many builders.
Migrating from OMV: Straightforward for pure file data. Docker Compose stacks port over cleanly through Community Applications’ Compose Manager.
Download: Unraid
Bottom line: Pick Unraid if the drives were bought at different times and buying a matched set is not on the table.
ZimaOS — Best for small mini-PC builds
ZimaOS is the polished container-first NAS OS from IceWhale, aimed at small x86 boxes like the ZimaBoard, N100 mini PCs, and Beelinks. The UI is the closest anyone has come to a Synology-style experience on DIY hardware, and the app store covers the usual media and productivity stacks.
Where it falls short: RAID and multi-drive setups are minimal. Two-plus bays with parity are not the target audience.
Pricing:
- Free: Full OS, no license required.
- Paid: Optional cloud services and hardware from IceWhale.
Migrating from OMV: Copy data over the network, redefine SMB shares, and rebuild Docker stacks in ZimaOS’s app manager. Under an hour for a small setup.
Download: ZimaOS
Bottom line: Pick ZimaOS if the box is a single-bay or two-bay mini PC and the priority is a clean UI.
CasaOS — Best for a first home lab
CasaOS is the sibling project to ZimaOS, aimed at anyone who wants a Docker-friendly OS on top of an existing Linux install. It sits on Debian or Ubuntu, adds an app store and a dashboard, and gets a Jellyfin/Nextcloud/Home Assistant box running in under an hour.
Where it falls short: No native storage protection. No multi-user story. Update cadence is slower than TrueNAS or Unraid.
Pricing:
- Free: Fully open source.
- Paid: None.
Migrating from OMV: Install CasaOS on a fresh Debian, mount the OMV drives, and redeploy containers from Compose files. Data does not need to move.
Download: CasaOS
Bottom line: Pick CasaOS if the goal is Docker apps first and storage second.
Proxmox VE — Best for virtualization plus storage
Proxmox VE is not strictly a NAS OS. It is a Debian-based hypervisor with KVM, LXC, and ZFS built in. Many home labs use it as the host, then run TrueNAS Scale or OMV as a VM alongside game servers, Home Assistant, and any other workload.
Where it falls short: The learning curve is steeper. SMB and NFS shares need to be set up inside a container or VM, not directly on the host.
Pricing:
- Free: Full feature set, community repository.
- Paid: Enterprise repo subscriptions from around €115/CPU/year for stability updates and support.
Migrating from OMV: Install Proxmox on the same hardware, import the drives, and run OMV as a VM if that eases the transition. Longer-term, most Proxmox users graduate off OMV entirely.
Download: Proxmox VE
Bottom line: Pick Proxmox if the box hosts VMs and containers on top of the storage layer.
Rockstor — Best for BTRFS-native builds
Rockstor takes the opposite bet from TrueNAS: BTRFS instead of ZFS, and Rock-ons instead of Kubernetes. The result is a lighter footprint than TrueNAS and a snapshot story that feels closer to a Synology DS box.
Where it falls short: Smaller community than TrueNAS or Unraid. Rock-ons catalogue is short. BTRFS RAID 5/6 is still not recommended for production data.
Pricing:
- Free: 45-day trial for stable channel plus Rock-ons.
- Paid: Stable subscription from $199/year, which unlocks the stable update channel and priority support.
Migrating from OMV: Copy data off first — Rockstor wants a fresh BTRFS pool. Rebuild shares from the web UI.
Download: Rockstor
Bottom line: Pick Rockstor if BTRFS snapshots are the feature that sold you and RAID 1 or single-drive is enough.
Ubuntu Server + Cockpit — Best for the roll-your-own crowd
Ubuntu Server with Cockpit is what many long-time OMV users end up on when they get tired of plugin drift. Cockpit gives a web UI for services, containers, storage, and updates without pretending to be a NAS product. Add Samba, ZFS on Linux, and any container runtime and the result is close to OMV minus the packaging assumptions.
Where it falls short: No app store. Every service is a package install. The UI is thinner than any of the dedicated NAS OSes.
Pricing:
- Free: LTS releases have five years of standard security updates, Ubuntu Pro extends to ten.
- Paid: Ubuntu Pro is free for personal use up to five machines.
Migrating from OMV: Fresh install, remount drives, reinstall Samba and any services by hand. Longest migration on this list, but ends up in the most flexible spot.
Download: Ubuntu Server Cockpit
Bottom line: Pick this stack if OMV’s abstractions are the thing you resent and running services directly is fine.
How to choose the right one
- Pick TrueNAS Scale if the box has 8 GB or more of RAM and the data is worth ZFS.
- Pick Unraid if the drives were bought at different times and buying matched ones is not on the table.
- Pick ZimaOS if the hardware is a single-bay or two-bay mini PC.
- Pick CasaOS if the goal is a Docker app dashboard on top of an existing Linux install.
- Pick Proxmox VE if the same box needs to run VMs and containers, not just storage.
- Pick Rockstor if the appeal is BTRFS snapshots and the array will stay small.
- Pick Ubuntu Server + Cockpit if a NAS OS’s abstractions are the thing you resent.
- Stay on OpenMediaVault if the current setup is stable, the plugin drift has not bitten you, and the workload is basic SMB shares plus a couple of Docker stacks.
FAQ
Is TrueNAS better than OpenMediaVault?
Better at ZFS and apps out of the box. Worse for low-RAM boxes and mdadm arrays. If the hardware supports ZFS, TrueNAS is usually the upgrade.
Can I import an OpenMediaVault mdadm array into another NAS OS?
Unraid and Ubuntu Server can read mdadm arrays directly. TrueNAS Scale, Rockstor, and ZimaOS want their own pools, so plan to copy data off before switching.
What is the lightest OpenMediaVault alternative?
ZimaOS and CasaOS are both lighter than OMV plus omv-extras plus Portainer. Ubuntu Server + Cockpit is lighter still if you skip the app-store layer.
Which OpenMediaVault alternative is free and open source?
TrueNAS Scale, ZimaOS, CasaOS, Proxmox VE, and Ubuntu Server + Cockpit are all free and open source. Unraid and Rockstor are commercial with free trials.
Do these alternatives support Docker?
All seven do. TrueNAS Scale runs it under Kubernetes, Unraid and Proxmox use standard Docker, and ZimaOS and CasaOS ship an app-store layer over Docker Compose.
