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Nagios Core vs PRTG Network Monitor comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Sep 21, 2025

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
8.8
Nagios Core reduces downtime and costs with quick alerts, providing full ROI and eliminating expensive monitoring tools.
Sentiment score
6.8
PRTG Network Monitor boosts efficiency and cost savings by automating monitoring, preventing issues, and consolidating data for fast ROI.
It provides accurate data for utilization, allowing us to monitor and optimize our investments in WAN connection capacity.
After introducing PRTG Network Monitor, we have saved time, and it's easy for everybody to monitor everything.
I have seen a return on investment with PRTG Network Monitor as it has saved a lot of time, and its monitoring has reduced manpower requirements, which has been helpful.
 

Customer Service

Sentiment score
5.1
Nagios Core relies on community support, praised for stability and resources, but lacks official help compared to Nagios XI.
Sentiment score
6.6
PRTG Network Monitor support is responsive, with online resources available, but improvements are needed for complex queries and remote assistance.
The setup process is well-documented, making it easy to deploy.
Tutorials are available so I can manage any issue with PRTG Network Monitor easily.
We are getting solutions on time, and they are very helpful.
 

Scalability Issues

Sentiment score
6.7
Nagios Core shows scalability for large networks but may need customizations and integrations for distributed environments.
Sentiment score
7.3
PRTG Network Monitor offers scalable network monitoring with remote probes, supporting small to enterprise environments despite potential high-sensor performance issues.
The solution is scalable.
On a scale of one to ten, scalability is rated as 9.5.
PRTG Network Monitor has the ability to scale and add new devices.
You can install them in each network, even if they are not connected, and it works.
 

Stability Issues

Sentiment score
8.2
Nagios Core is highly stable and reliable with minimal footprint, supporting extensive monitoring without network burden.
Sentiment score
7.9
PRTG Network Monitor is stable and reliable, with performance issues typically linked to setup, maintenance, and configuration.
I tried many other solutions at work, however, in terms of Nagios, I haven't seen any disruption or downtime.
We haven't needed vendor support for the last three years, which demonstrates the product's stability.
 

Room For Improvement

Nagios Core needs a more intuitive interface, better scalability, and features like enhanced reporting and integration with modern tools.
PRTG Network Monitor requires enhancements in performance, cloud integration, user interface, and affordability to meet user demands effectively.
They need to improve application performance monitoring, error tracing mechanisms, and log management.
PRTG Network Monitor should provide syslog monitoring since it is not available at this time.
PRTG Network Monitor can sometimes be too detailed and cluttered at the beginning, making it heavy to use.
 

Setup Cost

Nagios Core is a free, cost-effective open-source tool, but requires Linux expertise and incurs hosting and maintenance costs.
PRTG Network Monitor provides flexible pricing and comprehensive features, appealing to enterprises with various budget and monitoring needs.
Pricing is by the number of devices, not by sensor.
The prices are very high for PRTG Network Monitor.
It's not too high, nor too low, but it's reasonable.
 

Valuable Features

Nagios Core provides flexible, low-resource monitoring with customization, automation, efficient alerts, and integration support for reliable IT performance visibility.
PRTG Network Monitor offers rapid deployment, scalability, detailed insights, cost-effective licensing, and real-time monitoring, ensuring high customer satisfaction.
You can monitor anything.
PRTG Network Monitor already provided me with 100 free sensors, which is enough for my network monitoring.
PRTG Network Monitor has a good dashboard that shows each and every piece of information, so we can easily find out what is happening with the systems.
These reports help me in my day-to-day work, and I rely on them because they provide proof during escalation, with exact downtime logs and related information.
 

Categories and Ranking

Nagios Core
Ranking in Network Monitoring Software
12th
Ranking in IT Infrastructure Monitoring
11th
Average Rating
8.2
Reviews Sentiment
7.0
Number of Reviews
51
Ranking in other categories
No ranking in other categories
PRTG Network Monitor
Ranking in Network Monitoring Software
5th
Ranking in IT Infrastructure Monitoring
5th
Average Rating
8.2
Reviews Sentiment
7.0
Number of Reviews
106
Ranking in other categories
Cloud Monitoring Software (10th)
 

Mindshare comparison

As of October 2025, in the Network Monitoring Software category, the mindshare of Nagios Core is 2.5%, down from 3.2% compared to the previous year. The mindshare of PRTG Network Monitor is 4.1%, down from 4.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Network Monitoring Software Market Share Distribution
ProductMarket Share (%)
PRTG Network Monitor4.1%
Nagios Core2.5%
Other93.4%
Network Monitoring Software
 

Featured Reviews

Nishith-Vyas - PeerSpot reviewer
Valuable reporting and alert system with room for PDF export improvements
The NetEase reporting structure needs improvement, especially the availability report, which is weak. It should be generated automatically with minimal human intervention and should be exportable as a PDF. Besides that, an integrated PDF export feature for reports is necessary. Also, the alert mechanism and graphing mechanism need to be integrated properly into Nagios Core. Currently, integrating these requires advanced Linux knowledge. Integration of more visualization tools like Grafana and Prometheus for better graphing and visualization is also recommended.
Noman-Saleem - PeerSpot reviewer
Detects suden changes but significant pricing concerns affect the effectiveness of network traffic troubleshooting
We use PRTG Network Monitor for monitoring traffic on interfaces and the behavior of network traffic. If there are sudden changes in traffic or any configuration issues, we can sort them out using PRTG. It's very helpful for troubleshooting and monitoring traffic utilization on our interfaces…
report
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Comparison Review

it_user174738 - PeerSpot reviewer
May 31, 2015
Nagios vs. Zabbix vs. PRTG vs. Spiceworks vs. Solarwinds Network Performance Monitor
I have researched a quite a few network monitoring tools which can be used for various monitoring purposes of not only the servers, but the intermediate routers as well. There are majorly three types of these softwares. Ones which are completely open-source, you can do almost anything you want…
 

Top Industries

By visitors reading reviews
Computer Software Company
14%
Government
9%
Comms Service Provider
9%
Manufacturing Company
9%
Computer Software Company
12%
Government
9%
Financial Services Firm
8%
Comms Service Provider
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business20
Midsize Enterprise11
Large Enterprise22
By reviewers
Company SizeCount
Small Business56
Midsize Enterprise18
Large Enterprise40
 

Questions from the Community

What do you like most about Nagios Core?
What I like about Nagios Core is that it helps me ensure everything is running smoothly by checking the status of hosts and services.
What is your experience regarding pricing and costs for Nagios Core?
Nagios Core is a free and open-source product. We don't charge for the product itself, but we charge for the man-hour costs related to installation, configuration, ongoing operation, and maintenance.
What needs improvement with Nagios Core?
The dashboard should be improved. It's very simple. I don't have a very clear or specific suggestion. You can change the skin of the dashboard, however, it's good for me.
What is the best network monitoring software for large enterprises?
PRTG network monitor is one of the best tool i have ever used for the monitoring. It have auto discovery option. it avoid the configuring the device in PRTG. It automatically discover the device an...
What do you like most about PRTG Network Monitor?
The tool is integrated with our email for the alerts.
 

Comparisons

 

Overview

 

Sample Customers

Airbnb, Cisco, PayPal, FanDuel
Jameson Bank, Sidnix, RungeICT, MedicalAnimal, Truck-lite, GamingGrids, The Covell Group, Forsythn County Schools, NetMass, Musgrove Park Hospital, Lanes Health, Columbia Southern University, Vodafone, Intrust Bank
Find out what your peers are saying about Nagios Core vs. PRTG Network Monitor and other solutions. Updated: September 2025.
868,787 professionals have used our research since 2012.