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Networking · head to head

pfSense vs PRTG Network Monitor

pfSense logo

pfSense

Networking

Open source firewall software with a free Community Edition and a separate commercial Plus edition sold by Netgate

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 pfSense has a free tier, so it costs nothing to try first.
  • Each has a real cost: pfSense pfSense CE and pfSense Plus are not simply the same software with a support contract layered on top; Plus is a separately developed edition with its own feature set, and moving between them is a migration, not a toggle; 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: pfSense covers Stateful firewall and NAT, 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 pfSense and PRTG Network Monitor actually diverge.

Attributes where pfSense and PRTG Network Monitor differ
AttributepfSensePRTG Network Monitor
Starting priceFreeOn request
Pricing modelOpen source Community Edition, free; commercial Plus edition sold separately by NetgatePer sensor tier, billed monthly on an annual contract
Free tierYesNo
PlatformsLinuxWindows, 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 pfSense

  • Stateful firewall and NAT
  • VPN support
  • Traffic shaping and QoS
  • Package ecosystem
  • CE and Plus editions

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.

pfSense

  • A home user or small business wanting a free, fully-featured firewall on commodity hardware with no licence costnot PRTG Network Monitor
  • A business wanting an integrated firewall appliance with vendor support, typically buying a Netgate appliance bundled with pfSense Plusnot PRTG Network Monitor
  • A team wanting to evaluate advanced features like real-time threat intelligence before committing to Netgate hardware or a Plus migrationnot PRTG Network Monitor
  • An organisation replacing an expensive commercial firewall with an open source alternative while retaining the option to add commercial support laternot 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 pfSense
  • An organisation that wants a Windows-installable on-premises monitoring server with a polished UI out of the boxnot pfSense
  • A team sizing a monitoring purchase that needs to calculate sensor density per device carefully before committing to a tiernot pfSense
  • A company wanting hybrid on-premises and cloud monitoring from the same licence and dashboardnot pfSense

Where each one falls short

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

pfSense

  • pfSense CE and pfSense Plus are not simply the same software with a support contract layered on top; Plus is a separately developed edition with its own feature set, and moving between them is a migration, not a toggle
  • Running Plus on non-Netgate hardware depends on Netgate's current migration terms, which have changed over time, so a buyer planning to use white-box hardware with Plus should verify current eligibility rather than assume it works as it did previously
  • CE has no official vendor support channel; a business relying on it for production firewalling without a support contract is self-supporting on community forums
  • Some newer features and threat intelligence integrations are Plus-only, so CE users do not get feature parity going forward even though both editions remain under active development
  • Netgate's own appliance pricing and the terms of the CE-to-Plus migration path are not always clearly presented in one place, requiring some digging to understand the real total cost of a Plus deployment on non-Netgate hardware
  • As with any self-managed firewall, security depends on the operator applying updates and correctly configuring rules; there is no managed security operations layer included even in Plus

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

pfSense

Free
  • pfSense CEFree
    • Full firewall and routing functionality
    • No vendor lock-in to hardware
    • Community support
  • pfSense Plus (via Netgate appliance)$undefined/one-time
    • Bundled with Netgate hardware appliances from around $189
    • Threat intelligence feeds
    • Certified support tiers

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 pfSense if

  • You need stateful firewall and nat.
  • You want to start without paying.
  • You work on Linux.
  • You also want vpn support.
pfSense 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 pfSense or PRTG Network Monitor better?
Neither clearly leads. pfSense 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, pfSense or PRTG Network Monitor?
pfSense has a free tier; the other does not. Paid plans start at Free for pfSense and On request for PRTG Network Monitor.
Does pfSense or PRTG Network Monitor run on more platforms?
pfSense runs on Linux. PRTG Network Monitor runs on Windows, Web, iOS, Android.
Can I use pfSense for free?
Yes. pfSense has a free tier, so you can try it without paying. PRTG Network Monitor starts at On request.
What is pfSense best used for?
pfSense is most often used for a home user or small business wanting a free, fully-featured firewall on commodity hardware with no licence cost, a business wanting an integrated firewall appliance with vendor support, typically buying a netgate appliance bundled with pfsense plus, a team wanting to evaluate advanced features like real-time threat intelligence before committing to netgate hardware or a plus migration, an organisation replacing an expensive commercial firewall with an open source alternative while retaining the option to add commercial support later. Of those, a home user or small business wanting a free, fully-featured firewall on commodity hardware with no licence cost and a business wanting an integrated firewall appliance with vendor support, typically buying a netgate appliance bundled with pfsense plus are not what PRTG Network Monitor is typically brought in for.
What can pfSense do that PRTG Network Monitor cannot?
pfSense covers Stateful firewall and NAT, VPN support, Traffic shaping and QoS, Package ecosystem. PRTG Network Monitor covers Sensor-based monitoring, Auto-discovery, Multiple monitoring technologies, Maps and dashboards.

Answered from the vendors’ own pages

pfSense: What is the difference between pfSense CE and pfSense Plus?

CE is the free, open source edition installable on any compatible hardware; Plus is a commercial edition from Netgate with additional features and support, typically bundled with Netgate appliances.

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.

pfSense: Can I run pfSense Plus on my own hardware?

It is possible through a migration from a CE installation via Netgate's official channel, but the terms and availability of that path have changed over time and should be confirmed directly with Netgate.

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.

pfSense: Is pfSense CE really free with no catch?

Yes, CE has no licence fee and no hardware lock-in, though it comes with community rather than vendor support.

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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