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Networking · head to head

LibreNMS vs PRTG Network Monitor

LibreNMS logo

LibreNMS

Networking

Free, community-driven network monitoring with commercial support sold by a third-party partner, not the project itself

From
Free
Rated
-
Full reviewWebsite
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

The short version

  • Only LibreNMS has a free tier, so it costs nothing to try first.
  • Each has a real cost: LibreNMS there is no official LibreNMS company; commercial support runs through a single designated third-party partner, Config Services Ltd, rather than a broad vendor support market; 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
  • They diverge on capability: LibreNMS covers SNMP auto-discovery, PRTG Network Monitor covers Sensor-based monitoring.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where LibreNMS and PRTG Network Monitor differ
AttributeLibreNMSPRTG Network Monitor
Starting priceFreeOn request
Pricing modelOpen source, no licence fee; commercial support sold by a third-party partnerPer sensor tier, billed monthly on an annual contract
Free tierYesNo
PlatformsLinux, WebWindows, Web, iOS, Android

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 LibreNMS

  • SNMP auto-discovery
  • Device and OS support
  • Alerting
  • API
  • Distributed polling

Only in PRTG Network Monitor

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

What people use each for

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

LibreNMS

  • A network team wanting SNMP-based device monitoring with zero licence cost and full control over the deploymentnot PRTG Network Monitor
  • An organisation with in-house Linux and networking expertise that does not need a vendor support contractnot PRTG Network Monitor
  • A team wanting an alternative to Icinga that is focused specifically on network device polling rather than general infrastructure monitoringnot PRTG Network Monitor
  • A company wanting SLA-backed support for LibreNMS but without wanting to build that capability in-house, contracting the designated partner insteadnot PRTG Network Monitor

PRTG Network Monitor

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

Where each one falls short

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

LibreNMS

  • There is no official LibreNMS company; commercial support runs through a single designated third-party partner, Config Services Ltd, rather than a broad vendor support market
  • Self-hosting and maintaining LibreNMS requires real Linux and SNMP expertise, and there is no vendor obligated to fix issues without a separate paid support arrangement
  • Device and OS support quality varies because it is community-contributed, so obscure or newer hardware may have thinner or less accurate polling templates than mainstream vendors
  • The web interface, while functional, is less polished out of the box than commercial tools like PRTG, and dashboard customisation takes more manual configuration
  • Scaling to a very large device count requires manually configuring distributed polling, which is more operational work than a SaaS tool that scales transparently
  • Project direction depends on community and contributor priorities rather than a company roadmap, so feature development pace and priorities can be less predictable than a commercial vendor's

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

Pricing, plan by plan

LibreNMS

Free
  • LibreNMSFree
    • Full functionality
    • No usage limits
    • Community forum and GitHub support

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

Which should you pick?

Choose LibreNMS if

  • You need snmp auto-discovery.
  • You want to start without paying.
  • You work on Linux, Web.
  • You also want device and os support.
LibreNMS review

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

Questions people ask

Is LibreNMS or PRTG Network Monitor better?
Neither clearly leads. LibreNMS starts at Free and PRTG Network Monitor at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, LibreNMS or PRTG Network Monitor?
LibreNMS has a free tier; the other does not. Paid plans start at Free for LibreNMS and On request for PRTG Network Monitor.
Does LibreNMS or PRTG Network Monitor run on more platforms?
LibreNMS runs on Linux, Web. PRTG Network Monitor runs on Windows, Web, iOS, Android.
Can I use LibreNMS for free?
Yes. LibreNMS has a free tier, so you can try it without paying. PRTG Network Monitor starts at On request.
What is LibreNMS best used for?
LibreNMS is most often used for a network team wanting snmp-based device monitoring with zero licence cost and full control over the deployment, an organisation with in-house linux and networking expertise that does not need a vendor support contract, a team wanting an alternative to icinga that is focused specifically on network device polling rather than general infrastructure monitoring, a company wanting sla-backed support for librenms but without wanting to build that capability in-house, contracting the designated partner instead. Of those, a network team wanting snmp-based device monitoring with zero licence cost and full control over the deployment and an organisation with in-house linux and networking expertise that does not need a vendor support contract are not what PRTG Network Monitor is typically brought in for.
What can LibreNMS do that PRTG Network Monitor cannot?
LibreNMS covers SNMP auto-discovery, Device and OS support, Alerting, API. PRTG Network Monitor covers Sensor-based monitoring, Auto-discovery, Multiple monitoring technologies, Maps and dashboards.

Answered from the vendors’ own pages

LibreNMS: Is LibreNMS really free with no paid tier of the software?

Yes, the software itself has no licence fee; only optional third-party support is paid.

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.

LibreNMS: Who provides paid support?

Config Services Ltd is the designated partner offering SLA-backed support and consultancy for LibreNMS.

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.

LibreNMS: Does LibreNMS require SNMP access to every device?

Yes, its core monitoring approach relies on SNMP polling, so devices must have SNMP enabled and reachable.

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.

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