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Operating Systems · head to head

OpenWrt vs PRTG Network Monitor

OpenWrt logo

OpenWrt

Operating Systems

Linux firmware replacement for routers and embedded network devices, with a package manager and writable filesystem

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 OpenWrt has a free tier, so it costs nothing to try first.
  • Each has a real cost: OpenWrt support is per device and per hardware revision, so a model number that worked last year may point at a different chipset this year and be unsupported.; 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: OpenWrt covers Package manager, 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 OpenWrt and PRTG Network Monitor actually diverge.

Attributes where OpenWrt and PRTG Network Monitor differ
AttributeOpenWrtPRTG Network Monitor
Starting priceFreeOn request
Pricing modelOpen source, no licence feePer sensor tier, billed monthly on an annual contract
Free tierYesNo
PlatformsRouters, Access points, x86-64, ARM, MIPS, Embedded gatewaysWindows, Web, iOS, Android
CategoryOperating SystemsNetworking

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

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 OpenWrt

  • Package manager
  • LuCI web interface
  • Traffic shaping
  • VPN and DNS
  • VLAN and multi-network
  • OpenWrt One

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.

OpenWrt

  • Extending the useful life of an ISP-supplied router that has stopped receiving security updatesnot PRTG Network Monitor
  • Separating guest, IoT and work devices onto VLANs on hardware that does not offer it nativelynot PRTG Network Monitor
  • Running WireGuard, ad blocking or DNS over TLS at the edge rather than configuring every clientnot PRTG Network Monitor
  • Building small industrial or retail gateways where a full Linux distribution is too heavynot 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 OpenWrt
  • An organisation that wants a Windows-installable on-premises monitoring server with a polished UI out of the boxnot OpenWrt
  • A team sizing a monitoring purchase that needs to calculate sensor density per device carefully before committing to a tiernot OpenWrt
  • A company wanting hybrid on-premises and cloud monitoring from the same licence and dashboardnot OpenWrt

Where each one falls short

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

OpenWrt

  • Support is per device and per hardware revision, so a model number that worked last year may point at a different chipset this year and be unsupported.
  • Flashing can brick a device permanently, and on hardware without a serial console or a recovery bootloader there is no way back.
  • Devices with 4MB or 8MB of flash have been dropped from recent releases, so a lot of older hardware is stuck on unsupported versions with known vulnerabilities.
  • Hardware acceleration for NAT and routing depends on vendor drivers, and enabling traffic shaping frequently cuts a gigabit connection to a fraction of its rated throughput.
  • A sysupgrade keeps your configuration but not your installed packages, so every release upgrade is followed by reinstalling and reconfiguring add-ons by hand.

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

OpenWrt

Free
  • OpenWrtFree
    • No licence fee for any device count
    • All packages from the official feeds
    • Community support via forum and wiki

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 OpenWrt if

  • You need package manager.
  • You want to start without paying.
  • You work on Routers, Access points, x86-64, ARM, MIPS, Embedded gateways.
  • You also want luci web interface.
OpenWrt 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 OpenWrt or PRTG Network Monitor better?
Neither clearly leads. OpenWrt 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, OpenWrt or PRTG Network Monitor?
OpenWrt has a free tier; the other does not. Paid plans start at Free for OpenWrt and On request for PRTG Network Monitor.
Does OpenWrt or PRTG Network Monitor run on more platforms?
OpenWrt runs on Routers, Access points, x86-64, ARM, MIPS, Embedded gateways. PRTG Network Monitor runs on Windows, Web, iOS, Android.
Can I use OpenWrt for free?
Yes. OpenWrt has a free tier, so you can try it without paying. PRTG Network Monitor starts at On request.
What is OpenWrt best used for?
OpenWrt is most often used for extending the useful life of an isp-supplied router that has stopped receiving security updates, separating guest, iot and work devices onto vlans on hardware that does not offer it natively, running wireguard, ad blocking or dns over tls at the edge rather than configuring every client, building small industrial or retail gateways where a full linux distribution is too heavy. Of those, extending the useful life of an isp-supplied router that has stopped receiving security updates and separating guest, iot and work devices onto vlans on hardware that does not offer it natively are not what PRTG Network Monitor is typically brought in for.
What can OpenWrt do that PRTG Network Monitor cannot?
OpenWrt covers Package manager, LuCI web interface, Traffic shaping, VPN and DNS. PRTG Network Monitor covers Sensor-based monitoring, Auto-discovery, Multiple monitoring technologies, Maps and dashboards.

Answered from the vendors’ own pages

OpenWrt: How do I know my router is supported?

Check the Table of Hardware for your exact model and revision before buying or flashing. Do not assume that a supported model number means a supported unit; manufacturers change chipsets within a model.

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.

OpenWrt: Is the OpenWrt One worth buying over a used router?

If you are evaluating OpenWrt rather than rescuing hardware you own, yes. It is supported by definition, has an unbrickable boot arrangement, and part of the price funds the project.

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.

OpenWrt: Will flashing void my warranty?

Almost always, and it may also break the ISP remote management your provider relies on for support. Keep the stock firmware image before you start.

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.

OpenWrt: Is opkg still the package manager?

It is in the current stable releases, but development has moved towards apk, so expect package tooling and command syntax to change at the next major release.

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