Synology vs TrueNAS

Synology sells you a finished product: a box, an operating system (DSM), and a support line. You plug in drives and a friendly UI walks you through the rest. TrueNAS is free software you install on hardware you provide, which gives you control and value at the cost of doing the build and setup yourself.

That is the whole tension: pay more for a polished, supported appliance, or invest effort for power, ZFS, and a better price per terabyte.

DSM is genuinely good: friendly, feature-rich, with a polished package center for apps like photos, backups, and media. For a non-technical user or anyone who wants set-and-forget storage with a vendor to call, Synology is hard to beat.

The downsides are hardware and control. Synology's CPUs are often modest for the price and the appliance carries a premium. In 2025 its new Plus models also refused to build storage pools on third-party drives; DSM 7.3 reversed that in October 2025, so any SATA NAS drive works again, but M.2 NVMe pools and SSD cache still need drives from Synology's compatibility list. On an appliance, the vendor sets the rules.

TrueNAS is free, runs on hardware you choose, and is built on ZFS, so you get checksummed integrity, snapshots, and replication. It is more capable for advanced uses, scales further, and costs less per terabyte once you supply the hardware.

The trade is effort: you build or repurpose a machine, plan your ZFS pool, and maintain it yourself, with the community rather than a vendor for support. For people comfortable with that, the integrity and value are worth it.

Want plug-and-play storage with official support and a friendly UI? Buy a Synology, and make sure it is on DSM 7.3 or later before you build the pool. Want ZFS-grade integrity, full control, and better value on your own hardware? Run TrueNAS.

If you have decided to build your own, the next question is which NAS OS, so see TrueNAS vs Unraid, and Proxmox vs TrueNAS if you also want virtualization on the box.