Hardware
TrueNAS vs Unraid vs Synology
TrueNAS vs Unraid vs Synology: which NAS OS should I pick?
Short answer
TrueNAS vs Unraid vs Synology: which NAS OS should I pick?
Pick TrueNAS if data integrity is the priority and you'll run matched drives — it gives you ZFS and is free. Pick Unraid if you want to add mismatched drives one at a time and run apps easily, and don't mind paying for the licence. Pick Synology if you want a NAS that just works and asks nothing of you. It's a hands-on-versus-hands-off choice more than a better-versus-worse one.
All three turn drives into shared network storage, but they're different kinds of product. TrueNAS is free software built around ZFS for data integrity. Unraid is paid software whose signature trick is pooling drives of different sizes and letting you expand one disk at a time. Synology is an appliance — you buy the box and its polished software together and mostly leave it alone.
- $0TrueNAS licence (free, ZFS-based)
- Any sizesUnraid — mix drive capacities, add one at a time
- Buy-and-forgetSynology's whole pitch (appliance, polished, hands-off)
These aren’t ranked — they’re different philosophies
It’s tempting to want a winner, but TrueNAS, Unraid, and Synology are really three answers to “how hands-on do you want your storage to be?” That’s the axis that should decide it, not a spec sheet.
Who each is for
- TrueNAS — free, ZFS, integrity-first. Best when you’ll run matched drives and you want the filesystem actively protecting your data. Most technical of the three.
- Unraid — flexible and friendly. Mix any drives, add one at a time, and enjoy the smoothest app/Docker experience. You pay for the licence; many happily do.
- Synology — the appliance. Buy it, plug it in, and mostly forget it. The right call when you want a NAS and specifically don’t want a hobby.
The honest steer
If you’d enjoy the tinkering and care about data integrity, TrueNAS. If you want flexibility and easy apps without a research project, Unraid. If you want it to just work and never think about it, Synology — and don’t let anyone make you feel you’ve “cheated” for buying the easy, reliable thing. The best NAS OS is the one that matches how much of your attention you actually want to spend.
| Factor | TrueNAS | Unraid | Synology |
|---|---|---|---|
| Cost | Free | Paid licence | Buy the box |
| Drives | Prefers matched | Any sizes, add one at a time | Fixed bays |
| Strength | ZFS integrity | Flexible + easy apps | Just works |
| Best for | Data-integrity nerds | Grow-as-you-go + Docker | Set-and-forget |
I run TrueNAS on my storage because I want ZFS watching my media and backup pool for integrity. If I were optimising for 'add a drive whenever, run apps easily,' I'd honestly pick Unraid — and Synology is for people who want a NAS and nothing else to think about.
Common questions
Which is best for a beginner?
Synology, without much contest, if your budget allows the appliance — the software is polished and forgiving and you'll rarely fight it. Unraid is the friendliest of the build-it-yourself options, especially for adding drives and running apps. TrueNAS is the most 'know what you're doing,' though its ZFS payoff is real.
Can I add drives one at a time?
That's exactly Unraid's headline feature — mix capacities and expand a single disk at a time, which fits how home NASes actually grow. TrueNAS with ZFS prefers you add storage in matched groups, so plan expansion in pairs. Synology depends on the model but is generally less flexible than Unraid here.
Do any of them run Docker apps?
All three do to some degree. Unraid is especially loved for its app/Docker experience, Synology has a decent package ecosystem, and TrueNAS runs apps too. If running lots of self-hosted apps directly on the NAS is a goal, Unraid tends to be the smoothest.