TrueNAS SCALE vs CORE in 2026: Which to Install

For a new home NAS in 2026, install TrueNAS SCALE. The Linux-based SCALE line (now called TrueNAS Community Edition) is the actively developed platform, while TrueNAS CORE reached its final release, 13.3-U1.2, in April 2025 and is no longer under active development per the TrueNAS software-status page. CORE still runs reliably on existing hardware, but it is no longer the forward-looking choice for a fresh install.

TrueNAS ships in two flavors: TrueNAS CORE (FreeBSD-based, the long-time default) and TrueNAS SCALE (Debian Linux-based, with first-class support for KVM virtual machines and Docker-based apps). iXsystems has made SCALE the strategic future of the platform and placed CORE in maintenance status, so the practical question in 2026 is less “which is better” and more “is there any reason left to start on CORE.”

This guide explains how the two differ, what each is genuinely good at, and how to choose.

The short version

• Choose SCALE if you want to run containerized applications (Nextcloud, Jellyfin, Immich, Pi-hole, Home Assistant) directly on your NAS, or if you want to host VMs for things like Windows Server or Linux dev environments.
• Choose CORE if you want a focused storage appliance and nothing else, you already trust FreeBSD/jails, or you want the OS that has the longest production track record with OpenZFS.
• Both use OpenZFS underneath. Your pool is portable between them in either direction (with one important caveat we cover below).

What is the same

Both products are built around the same OpenZFS implementation, so the things people associate with TrueNAS — pool layouts, datasets and zvols, snapshots, replication, SMB, NFS, iSCSI, S.M.A.R.T. tests, scheduled scrubs — work essentially identically in either. The web UI looks slightly different but maps to the same concepts.

If you already know one, the other is a short transition.

What is different

Operating system

CORE runs on FreeBSD 13 (with FreeBSD 14 in the most recent releases). SCALE runs on Debian Linux 12.

That difference cascades. FreeBSD has a smaller hardware compatibility surface and fewer third-party drivers. Linux has broader support for newer NICs, GPUs (relevant if you transcode media), and consumer-grade NVMe controllers. For older or off-brand hardware, SCALE will more often work without intervention.

Apps and containers

This is the biggest functional split.

TrueNAS SCALE runs applications through a Kubernetes-based system (replaced incrementally in newer SCALE releases by a Docker ↗ Compose model). Out of the box you can deploy:

• Plex, Jellyfin, Emby (media)
• Nextcloud, Syncthing, Immich (file sync and photos)
• Vaultwarden ↗, Home Assistant, Pi-hole, AdGuard Home
• Dozens of other apps from the official catalog and from community catalogs like TrueCharts

TrueNAS CORE runs services through FreeBSD jails (via the older “Plugins” system, which is now considered legacy). You can run jails manually, but the Plugins catalog has stagnated and the community has largely moved on. If you want apps on the NAS in 2026, SCALE is where the energy is.

Virtual machines

Both support VMs, but SCALE uses KVM (the Linux kernel hypervisor), which has wider OS support, better performance on commodity hardware, and PCI passthrough that works on a much broader range of motherboards. CORE uses bhyve (the FreeBSD hypervisor), which is fine but more limited.

If running VMs on your NAS is important to you — Windows Server, a Linux dev box, a Home Assistant OS install — SCALE is the better choice.

High availability and replication

For multi-node HA setups (typically only relevant to TrueNAS Enterprise hardware), the story differs between the two platforms. For most home users this is not a deciding factor. Replication between two TrueNAS systems works in either direction, including CORE ↔ SCALE.

Pool portability between CORE and SCALE

OpenZFS pools created on either platform can be imported on the other, but SCALE may use newer feature flags (notably around encryption, raidz expansion, and the newer dataset properties) that CORE cannot yet read. If you build a pool on SCALE and later try to move it to CORE, you may find features enabled that block the import.

The safe rule: pools created on CORE import cleanly into SCALE. Pools created on SCALE may not import into CORE depending on the feature flags enabled. If you anticipate moving in either direction, check the OpenZFS feature flags on your pool before you start writing data.

Is CORE still worth installing in 2026?

For a brand-new install, generally no. With CORE in maintenance status and no further feature releases, starting fresh on a platform that has stopped advancing makes little sense for most people. The honest exceptions are narrow:

• You are reusing an existing CORE box, it works, and you have no apps or VMs you want to add, so there is no pressure to move.
• You depend on a specific FreeBSD jail or workflow that you have not yet reproduced under Linux.
• You are running older hardware fully proven on FreeBSD and you have a concrete reason not to retest under Linux.

Even in those cases, the migration path runs one direction: CORE to SCALE. iXsystems supports a UI “sidegrade” from CORE 13.0 or 13.3 that preserves your pools and core NAS settings, so choosing CORE today does not strand your data, it just defers an eventual move.

When SCALE is the right call

Pick SCALE if any of these are true:

• You want apps on the NAS (media servers, photo sync, password managers).
• You want KVM VMs alongside your storage.
• You have newer hardware (recent Intel/AMD desktop CPUs, recent 10GbE NICs, GPUs for transcoding).
• You already run Linux elsewhere and prefer a consistent environment.

For most new home installs in 2026, this is SCALE.

Migrating from CORE to SCALE

Because CORE is now end-of-feature-life, most existing CORE users will migrate to SCALE eventually. The good news is the move is designed to be non-destructive: your OpenZFS pools and most NAS settings carry over.

• From CORE 13.0 or 13.3, you can sidegrade in-place to recent SCALE releases through the UI update process, which preserves data and essential settings. Migrating directly to the newest SCALE trains (24.10 and later) is not supported through the UI from CORE and requires a clean install of SCALE followed by importing your pool.
• Back up first regardless. A verified snapshot and replication backup before any OS swap is the difference between a smooth migration and a bad week.
• Re-create services on the SCALE side. Jails and Plugins do not carry over to SCALE’s app model. Plan to redeploy those workloads as SCALE apps once you are on the new platform; the TrueNAS SCALE apps getting-started guide walks through the catalog. If you are doing a clean install, the step-by-step SCALE setup guide covers first-boot configuration.

What we recommend

Default to TrueNAS SCALE unless you have a specific reason to choose CORE. iXsystems is putting development energy into SCALE; the application ecosystem is healthier there; and the hardware support is broader. A home NAS user today is more often than not going to want at least one or two apps running on the box, and SCALE makes that path of least resistance.

If your only use case is “give me a place to put SMB shares for my photos and documents,” either platform will serve you well for the next decade. SCALE just gives you more headroom if your needs change.

Next steps

• See our guide on ZFS Pool Design: RAIDZ vs Mirrors for a Home NAS to plan your pool layout before you install.
• For hardware selection, see The TrueNAS Hardware Guide: What Actually Matters for a Home NAS.
• Once installed, Snapshot and Replication Strategy covers how to keep your data recoverable.