NetXMS and Zabbix are the two open-source monitoring platforms that small and mid-sized IT teams compare most often. Both are free, both monitor networks and servers, and both will run your infrastructure for years. The decision usually comes down to three things: how network-centric your environment is, which operating system you want the server on, and how much ready-made content you want out of the box.
The short answer
- Choose NetXMS if your world is switches, routers and topology — it builds Layer 2 and Layer 3 maps automatically and models business services well.
- Choose Zabbix if you want the largest community, the widest catalogue of ready-made templates and a server that scales without any node cap.
Side by side
| Feature | NetXMS | Zabbix |
|---|---|---|
| Licence | Open source (GPL / LGPL) | Open source, AGPLv3 since 7.0 (GPLv2 before); free for commercial use |
| Current version | 6.2.5 (September 2026) | 7.4 standard; 7.0 is the long-term support release; 8.0 LTS scheduled for Q3 2026 |
| Server platforms | Linux and Windows (Windows capped at 250 nodes without a licence) | Linux |
| Agents | Windows and Linux (x86, x86-64, Arm) | Windows and Unix-like systems |
| Database | PostgreSQL, MySQL, MariaDB, Oracle or MS SQL Server | MySQL/MariaDB or PostgreSQL (TimescaleDB optional) |
| Interface | Java desktop client plus a web interface | Web interface |
| Network topology | Automatic L2/L3 maps from LLDP, CDP and switch forwarding tables | Network discovery; maps are assembled rather than drawn from topology |
| Ready-made templates | Fewer | Very large official and community catalogue |
| Scripting | NXSL built in | Scripts, JavaScript preprocessing, external checks |
| Nagios plugins | Can run them directly | Through external checks |
Where NetXMS wins
NetXMS was built by a team with a networking background, and it shows. Point it at your subnets and it discovers devices, reads LLDP, CDP and forwarding tables, and draws which device is plugged into which switch port. For a network engineer that map is often the single most useful screen in the product.
Its business service model is the other strength: you define what “mail is working” means — a set of hosts, services and checks — and get availability for the service, not just a wall of host states. Event correlation keeps one failed core switch from producing fifty alarms.
It is also one of the few serious platforms whose server runs on Windows. That is convenient in a Microsoft shop, with one caveat that matters: the Windows server build stops at 250 nodes without a licence. On Linux there is no cap.
Where Zabbix wins
Zabbix has the bigger ecosystem, and for many teams that settles it. There are official templates for most servers, databases, hypervisors and network vendors you will meet, plus a large community producing more. Problems you hit have usually been solved on a forum already.
It scales without any node limit, the whole interface lives in a browser, and its release cycle is predictable — a long-term support version every couple of years with five years of support. For an organisation that wants to standardise monitoring and train people on it, that predictability matters.
The trade-offs: the server runs on Linux only, and Zabbix is less automatic about physical network topology than NetXMS.
Effort to get started
Neither is a one-afternoon install for a real network. Both need a database, both reward a week of collecting data before you set thresholds, and both will produce noise until tuned. Zabbix’s templates shorten the first week for servers and applications; NetXMS’s discovery and maps shorten it for networks.
A practical way to decide
- Mostly network gear and you want topology? Start with NetXMS.
- Mostly servers, databases and applications, and you want templates for everything? Start with Zabbix.
- Must the server run on Windows? NetXMS — and plan for the 250-node limit.
- Expect thousands of devices and a team behind the tool? Zabbix’s scale and community are the safer bet.
For small networks, both may be more than you need: The Dude draws simple network maps for free (though MikroTik has discontinued it), and our guide to free network monitoring tools for Windows covers the lighter options.
FAQ
Is NetXMS better than Zabbix?
For network-centric environments with a need for topology maps, often yes. For server and application monitoring with ready-made templates and a large community, Zabbix usually wins.
Are NetXMS and Zabbix free?
Both are open source and free to use, including commercially. Both vendors sell support separately.
Can the Zabbix server run on Windows?
No, the Zabbix server runs on Linux. Zabbix agents run on Windows.
What is the NetXMS 250-node limit?
The Windows server build of NetXMS monitors up to 250 nodes without a licence. The Linux server has no such limit.
Which one is easier to set up?
Neither is trivial. Zabbix templates speed up server monitoring; NetXMS discovery and maps speed up network monitoring.
