TrueNAS vs Unraid vs XigmaNAS: Best Free NAS OS in 2026

TrueNAS vs Unraid vs XigmaNAS: Best Free NAS OS in 2026. TrueNAS vs Unraid vs XigmaNAS: Best Free NAS OS in 2026. Published: April 3, 2026 | Category: NAS & Storage | Reading time: 16 min. When it comes to building a home NAS, choosing the right operating system is the most critical decision you'll make. TrueNAS (formerly FreeNAS), Unraid, and XigmaNAS are the three dominant free options — each with fundamentally different philosophies. This guide breaks down every major difference to help you pick the right one for your setup.