Paessler PRTG

Paessler PRTG – The best alternative to Nagios

  • Enjoy an easy-to-use and powerful monitoring solution
  • Start monitoring your network within minutes
  • Save precious time while managing your network

Our users give top ratings for monitoring with Paessler PRTG



Why choose PRTG as a Nagios alternative













Nagios vs. PRTG: The advantages of both monitoring solutions


  • Linux-based, open-source monitoring tool without license costs
  • Can be customized by using a huge number of community-developed plug-ins


  • Powerful monitoring tool with great usability via web, desktop & mobile apps
  • Customizable, interactive dashboards and network maps
  • Real-time alerting, custom notifications, and automated reporting
  • Preconfigured PRTG sensors and device templates for quick & easy integration
  • Expert technical support & detailed online documentation








Free vs. easy to use and time-saving:

Why an open-source tool might not be the most cost-effective choice

At first glance, Nagios open-source software seems considerably less expensive than PRTG. After all, why should you pay for something that you can get for free?

Nagios saves you money but costs you time & effort

When it comes to software that you need to customize to meet the specific needs of a company, its purchase price is only a small factor if you consider its overall costs.

The initial setup of Nagios already takes a lot of time. Moreover, you can only install the tool’s free edition via Linux/Unix and all devices and checkpoints must be added using shell commands.

It is not uncommon for the setup to take several days, even for experienced Linux users. And if you need to customize your Nagios configuration later, you can count on spending an enormous amount of time and effort to get it done.

Choose PRTG, a tool which is ready to go in minutes

PRTG is configured in just a few quick clicks. Its auto-discovery function detects all devices and services in your network automatically and creates a first set of so-called PRTG sensors.

Adding, processing, and deleting sensors is straightforward and extremely intuitive thanks to an easy-to-understand user interface.

The time and energy that you spend configuring Nagios can quickly let operational costs go through the roof. At the end of the day, the seemingly free open-source tool is not really that inexpensive.


A constant overview of your network – even while on the go

Set up PRTG in minutes and use it on almost any mobile device.


PRTG comes with all the features you need, plus more your IT infrastructure won't want to live without.



PRTG monitors these vendors and applications in one view!


vendors vm ware



PRTG makes network monitoring easy

Custom alerts and data visualization make it easy to monitor, identify, and prevent network issues.



PRTG is compatible with all major vendors, products, and systems

vendors applications blue


What network monitoring looks like in PRTG

Diagnose network issues by continuously monitoring your network. Show all performance and device data in real time and visualize it in graphic maps & dashboards to identify problems more easily. Gain the visibility you need to troubleshoot your entire network.



PRTG vs Nagios: All the features you need in an easy-to-use tool vs. low level of usability


Scalability can become complicated in Nagios

Nagios can be effective for small networks, and yes, the very basic version Nagios Core is available for free. It gets more complicated, however, if you need to manage larger environments. To set up Nagios correctly, you will need a lot of time and effort before reaching a professional standard, either by changing the source code or by using additional hardware to scale the solution.

PRTG right from the start, no forums needed

With PRTG, you won't waste countless hours reading forums and editing configuration files. After installing PRTG in just a few seconds, the smart setup assistant guides you through the setup and initial configuration. You can also use the auto-discovery feature to automatically create a comprehensive set of sensors for your entire network.

Join over 500,000 happy sysadmins

We would not put it as hard as Jonah Kowall does in his blog article: "Got Nagios? Get rid of it." And: "The level of usability and sophistication of the product (Nagios) is pretty much zero." But we, too, think that Nagios’s user interface is not very good and it’s definitely not very intuitive at all. PRTG, on the other hand, comes with a state-of-the-art, responsive web interface as well as smartphone apps for monitoring on the go.


Easily find the source of the problem with our PRTG network monitoring solution

Real-time alerts and custom notifications make it easy to solve issues with your network.



3 more reasons to use PRTG as a alternative


Have more time for your core responsibilities

As a system administrator, you must dedicate a great deal of time to the maintenance of your IT infrastructure, as this is the backbone of your company.

So let’s be honest: you could use the time that is needed to set up and maintain the operation of open-source software like Nagios or Zabbix in a much more efficient manner.

With the automated monitoring of PRTG, you are free to deal with other important tasks in your daily business.

Benefit from expert technical support

By purchasing a PRTG license, you will get free maintenance and support for one year. If you have a problem or question, our technical support team will respond within one business day.

Moreover, our extensive Paessler Knowledge Base offers you precise answers to almost any issue that you might have. This way, you  won’t have to spend hours browsing through online forums.

With PRTG, you’ll save both time and worry!

Use PRTG even without a technical background

With Nagios, it can take days or weeks to get used to and customize the open-source software to meet the specific demands of your company and network.

People who configure and use Nagios need to have deep technical knowledge to do so. And if a Nagios expert leaves the company, other colleagues will usually have a hard time understanding how to use the tool.

By contrast, PRTG is also extremely easy to use for non-techies – even colleagues who were not involved in the setup process have no trouble getting the hang of the tool and the monitored network environment.


"PRTG totally blows away similar and popular server-based monitoring software, for example Nagios and Pandora FMS. Both of these competing applications were difficult to set up and use, and the interfaces felt poorly designed, hokey, and I couldn’t imagine using the interfaces of these products on a daily basis.”

Clayton Hill, System Administrator,

Want to find out more? See a detailed comparison of PRTG and other network monitoring tools in this article.












Tired of using Nagios? It’s easy to switch to PRTG


If you currently use Nagios and wish to switch to PRTG, you’ll have no trouble doing so. Even larger network environments are usually configured in PRTG within a few short hours.

Thanks to the PRTG auto-discovery feature, you can quickly integrate your entire network into your monitoring setup – no matter from which manufacturers your network devices are.

Device templates are extremely useful for configuring several devices at the same time. As a result, a few clicks suffice to configure an entire IT environment.


Many of our customers migrated from Nagios to PRTG because of the easiness and flexibility that PRTG offers. Read how Peak Internet or NetMass employed PRTG Network Monitor instead of the open-source tool Nagios:


Peak Internet prides itself on offering the best technology and service to its customers. While many other ISPs are not bothered when their customers alert them to an outage, Peak wanted to do better. In the past, Peak Internet employed a variety of network monitoring tools (Nagios, Smoke Ping, Monit, Zenoss, What’s Up Gold, and Zabbix). "We were looking for a single point of monitoring for our whole business at the best cost, with ease of use," said David Placko, Chief Technology Officer at Peak Internet. "PRTG was a real winning solution for us."

Read the full case study


Nagios, designed for the Linux operating system, worked well in some configurations for NetMass. But soon there were concerns. "The NSClient++ solution with Nagios did not do as well for monitoring remote Windows servers," states Stephen Perkins, President and Chief Technical Officer of NetMass. "It was also very complex to manage and configure the multi-site plug-ins that we needed. Often, new services would not get properly configured in Nagios because of the extra overhead. Over time we just wanted an easier solution."

Read the full case study


Start network monitoring with PRTG and see how it can make your network more reliable and your job easier.




IT experts agree: Paessler PRTG is a great solution for IT infrastructure monitoring


“All-around winning
network monitor”

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“The real beauty of PRTG is the endless possibilities it offers”


“PRTG Network Monitor
is very hard to beat”


Create innovative solutions with Paessler’s partners

Partnering with innovative vendors, Paessler unleashes synergies to create
new and additional benefits for joined customers.


By integrating PRTG with Martello iQ, you can add a fast analytics layer to improve uptime, visualize your IT environment, and integrate all of your IT systems into a single pane of glass.

Read more


Integrating monitoring results from PRTG into NetBrain maps makes the foundation for network automation.

Read more


Siemon and Paessler bring together intelligent building technology and advanced monitoring and make your vision of intelligent buildings and data centers become reality.

Read more


PRTG makes network monitoring easy

Custom alerts and data visualization make it easy to monitor, identify, and prevent network issues.



PRTG vs. other monitoring tools

PRTG vs. other monitoring tools

We asked: would you recommend PRTG?
Over 95% of our customers say yes!


Paessler AG conducted trials in over 600 IT departments worldwide to tune its network monitoring software closer to the needs of sysadmins.
The result of the survey: over 95% of the participants would recommend PRTG – or already have.


Recommend PRTG


PRTG vs. Nagios: FAQ


1. Should I choose Nagios or PRTG?

Which monitoring tool is the best solution depends on your network and your preferences. If you only have Linux servers or prefer using open-source software, Nagios might be a good choice. For everyone who is looking for a powerful and easy-to-use monitoring software, PRTG is an excellent choice and more than just an alternative to Nagios.

2. Why should I buy a PRTG license instead of using the free tool Nagios?

The basic version of Nagios is free of charge. But most users spent many hours to set up and customize the tool. In case of problems, browsing through forums is often the only solution. PRTG is not only set up in minutes, but you also save a lot of time in daily use.

3. What is a sensor in PRTG?

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, for example the traffic of a switch port, the CPU load of a server, or the free space on a disk drive.
On average, you need about 5-10 sensors per device or one sensor per switch port.

Still not convinced?


More than 500,000
sysadmins love PRTG

Paessler PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.


Monitor your entire IT infrastructure

Bandwidth, servers, virtual environments, websites, VoIP services – PRTG keeps an eye on your entire network.


Try Paessler PRTG
for free

Everyone has different monitoring needs. That’s why we let you try PRTG for free.



Paessler PRTG 


Start network monitoring with PRTG and see how it can make your network more reliable and your job easier.




Network Monitoring Software - Version (June 13th, 2024)


Download for Windows and cloud-based version PRTG Hosted Monitor available


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Up to 100 sensors for free (Price List)

Unified Monitoring

Network devices, bandwidth, servers, applications, virtual environments, remote systems, IoT, and more

Supported Vendors & Applications

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