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Networking · head to head

PRTG Network Monitor vs Zabbix

PRTG Network Monitor logo

PRTG Network Monitor

Networking

Infrastructure monitoring licensed by sensor count, not by device, which changes what a licence actually covers

From
On request
Rated
-
Full reviewWebsite
Zabbix logo

Zabbix

Networking

Open source infrastructure and network monitoring with distributed proxies and templating

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Zabbix has a free tier, so it costs nothing to try first.
  • Each has a real cost: PRTG Network Monitor licensing by sensor rather than device means the real cost per device is unpredictable until sensor density is measured; a small network of complex devices can need a much larger tier than device count alone suggests; Zabbix the database is the scaling limit, and high frequency polling grows history tables fast enough that untuned installations hit housekeeping stalls and query timeouts within months.
  • They diverge on capability: PRTG Network Monitor covers Sensor-based monitoring, Zabbix covers Agent and agentless collection.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which PRTG Network Monitor and Zabbix actually diverge.

Attributes where PRTG Network Monitor and Zabbix differ
AttributePRTG Network MonitorZabbix
Starting priceOn requestFree
Pricing modelPer sensor tier, billed monthly on an annual contractOpen source, no licence fee
Free tierNoYes
PlatformsWindows, Web, iOS, AndroidLinux, Docker, Kubernetes, Web

Identical on both: user rating (Not yet rated), category (Networking).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in PRTG Network Monitor

  • Sensor-based monitoring
  • Auto-discovery
  • Multiple monitoring technologies
  • Maps and dashboards
  • Cloud and hybrid deployment

Only in Zabbix

  • Agent and agentless collection
  • Templates
  • Low-level discovery
  • Distributed proxies
  • Trigger expressions
  • Escalation actions

What people use each for

The jobs each tool is most often brought in to do.

PRTG Network Monitor

  • An IT team wanting network, server and application monitoring in one product rather than assembling separate open source toolsnot Zabbix
  • An organisation that wants a Windows-installable on-premises monitoring server with a polished UI out of the boxnot Zabbix
  • A team sizing a monitoring purchase that needs to calculate sensor density per device carefully before committing to a tiernot Zabbix
  • A company wanting hybrid on-premises and cloud monitoring from the same licence and dashboardnot Zabbix

Zabbix

  • A service provider monitoring thousands of customer devices where per-device commercial licensing is the largest line itemnot PRTG Network Monitor
  • Branch or industrial sites with unreliable links that need local collection and bufferingnot PRTG Network Monitor
  • Mixed estates where the same tool must poll SNMP switches, Linux hosts, Windows servers and Java applicationsnot PRTG Network Monitor
  • Replacing an aging Nagios installation while keeping script-based checks that already existnot PRTG Network Monitor

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

PRTG Network Monitor

  • Licensing by sensor rather than device means the real cost per device is unpredictable until sensor density is measured; a small network of complex devices can need a much larger tier than device count alone suggests
  • Different PRTG licence sizes cannot be combined on one server, so outgrowing a tier means a step change to the next tier rather than a smooth incremental add
  • It requires a Windows server for on-premises deployment, which is an added infrastructure and patching burden compared with a Linux-native open source alternative
  • Pricing is materially higher than open source options like Icinga or LibreNMS for comparable core monitoring capability, and the premium is for polish and support rather than unique functionality
  • The free tier (100 sensors) is limited enough that most real deployments quickly need a paid tier, so it functions more as a trial than a genuinely usable free offering
  • Custom sensor scripting and advanced configuration still require real monitoring expertise; the polished UI does not remove the underlying complexity of correctly instrumenting a large network

Zabbix

  • The database is the scaling limit, and high frequency polling grows history tables fast enough that untuned installations hit housekeeping stalls and query timeouts within months.
  • Initial configuration is heavy; getting useful alerting rather than noise requires understanding trigger expressions, macros and template inheritance, which is a multi-week learning curve for a team new to it.
  • The AGPLv3 change at version 7.0 affects anyone offering Zabbix over a network as part of a commercial service, and that obligation is easy to inherit accidentally during an upgrade.
  • The web interface is functional rather than pleasant, and many sites end up running Grafana alongside it purely for presentation, which is a second system to maintain.
  • Upgrades between major versions touch the database schema and can take hours on large history tables, so the maintenance window is proportional to how much data you kept.

Pricing, plan by plan

PRTG Network Monitor

On request
  • PRTG 500$200/month
    • Up to 500 sensors
  • PRTG 1000$358/month
    • Up to 1,000 sensors
  • PRTG 2500$742/month
    • Up to 2,500 sensors
  • PRTG 5000$1300/month
    • Up to 5,000 sensors

Zabbix

Free
  • ZabbixFree
    • No device, node or metric limits
    • Full feature set with no paid edition of the software
    • AGPLv3 from version 7.0 onward
  • Zabbix Technical Support$undefined/year
    • Tiered subscriptions with defined response times
    • Access to Zabbix engineers for configuration and performance issues
    • Bug fix priority and backports

Which should you pick?

Choose PRTG Network Monitor if

  • You need sensor-based monitoring.
  • You work on Windows, Web, iOS, Android.
  • You also want auto-discovery.
PRTG Network Monitor review

Choose Zabbix if

  • You need agent and agentless collection.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Web.
  • You also want templates.
Zabbix review

Questions people ask

Is PRTG Network Monitor or Zabbix better?
Neither clearly leads. PRTG Network Monitor starts at On request and Zabbix at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PRTG Network Monitor or Zabbix?
Zabbix has a free tier; the other does not. Paid plans start at On request for PRTG Network Monitor and Free for Zabbix.
Does PRTG Network Monitor or Zabbix run on more platforms?
PRTG Network Monitor runs on Windows, Web, iOS, Android. Zabbix runs on Linux, Docker, Kubernetes, Web.
Can I use Zabbix for free?
Yes. Zabbix has a free tier, so you can try it without paying. PRTG Network Monitor starts at On request.
What is PRTG Network Monitor best used for?
PRTG Network Monitor is most often used for an it team wanting network, server and application monitoring in one product rather than assembling separate open source tools, an organisation that wants a windows-installable on-premises monitoring server with a polished ui out of the box, a team sizing a monitoring purchase that needs to calculate sensor density per device carefully before committing to a tier, a company wanting hybrid on-premises and cloud monitoring from the same licence and dashboard. Of those, an it team wanting network, server and application monitoring in one product rather than assembling separate open source tools and an organisation that wants a windows-installable on-premises monitoring server with a polished ui out of the box are not what Zabbix is typically brought in for.
What can PRTG Network Monitor do that Zabbix cannot?
PRTG Network Monitor covers Sensor-based monitoring, Auto-discovery, Multiple monitoring technologies, Maps and dashboards. Zabbix covers Agent and agentless collection, Templates, Low-level discovery, Distributed proxies.

Answered from the vendors’ own pages

PRTG Network Monitor: Is PRTG licensed per device or per sensor?

Per sensor. Each individually monitored metric counts as one sensor, so a single device is typically several sensors.

Zabbix: Is Zabbix genuinely free for commercial use?

The software has no licence fee at any scale. From version 7.0 it is AGPLv3, so offering it as a network service to third parties carries source distribution obligations.

PRTG Network Monitor: Can I combine two PRTG licence tiers on one server?

No, Paessler states different license sizes cannot be combined on one PRTG installation.

Zabbix: What is the real cost of running it?

Database administration and the person who tunes it. Budget for PostgreSQL with TimescaleDB and someone who owns the retention policy.

PRTG Network Monitor: Is there a free tier?

Yes, PRTG offers a free tier limited to 100 sensors, which most production networks will exceed quickly.

Zabbix: How does it compare to a commercial per-device tool?

It removes the licence line entirely and adds an operations line. Below a few hundred devices the commercial tool is often cheaper in total; above that Zabbix wins clearly.

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