Open Source alternative to Synology DSM in 2026
We compare 1 self-hostable tool you can deploy on your own server in minutes, with license, tech stack and a ready-to-copy docker-compose.
Quick comparison
Sorted by featured first, then GitHub stars as a tiebreaker — the same rule we use across the whole site.
| Tool | License | Minimum RAM | Docker | GitHub |
|---|---|---|---|---|
| CasaOS Lightest option100% FOSSMost popular on GitHub | Apache-2.0 | ~4GB | — | ★ ~37,200 |
Detailed profile of each alternative
Alternative to Synology DSM
A Synology DSM-style dashboard for your own server, with a one-click App Store.
How much does Synology DSM cost, and how much can you save?
Synology DSM charges a recurring monthly fee. Self-hosting the alternative, you only pay for the server — usually a few dollars a month.
Calculate your exact savings in the SaaS Audit →Already know which one you want?
Add CasaOS to the Stack Builder and generate a ready-to-deploy docker-compose.yml, alone or alongside the rest of your stack.
Build my stackFrequently asked questions
Do I need Docker to self-host a Synology DSM alternative?
0 out of 1 have a ready-to-copy docker-compose.yml; the rest use their own installer (each tool's page says which).
How much RAM do I need at minimum?
The lightest option on this list is CasaOS, which runs on as little as 4GB of RAM — enough for a cheap VPS.
Are they all 100% free, or are there paid features like on Synology DSM?
Yes, it's 100% FOSS: no paid plan or locked features when self-hosted.