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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
6.6
PRTG Network Monitor provides cost-effective returns by enhancing efficiency, reducing downtime, and minimizing staffing needs through proactive monitoring.
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.
The implementation reduced our employee resources from 20-25 to 5-6 employees.
 

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
6.7
PRTG Network Monitor support is generally effective, but time zone issues and complex queries can delay responses.
They resolve our queries 24/7.
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.
 

Scalability Issues

Sentiment score
6.7
Nagios Core shows scalability for large networks but may need customizations and integrations for distributed environments.
Sentiment score
7.4
PRTG Network Monitor is scalable and flexible for varying deployments but requires extra licenses and hardware for growth.
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 highly stable with reliable performance, minimal downtime, and robust updates, despite minor external issues.
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.
PRTG Network Monitor is stable in my experience, and I have not encountered issues with crashes or downtime.
PRTG Network Monitor is very stable and requires low maintenance.
 

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 needs improvements in customization, performance, support, integration, analytics, and cost-efficiency for enhanced usability and flexibility.
The initial auto-discovery added too many unnecessary sensors, so auto-discovery should only take the necessary sensors into consideration.
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.
 

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 is cost-effective for enterprises, but costs may rise; offers flexible licensing with annual support.
The licensing part is a recurring license for every year, which is very affordable, making PRTG Network Monitor budget-friendly.
Pricing is by the number of devices, not by sensor.
The prices are very high for PRTG Network Monitor.
 

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 is valued for its rapid deployment, intuitive interface, scalability, reliability, and comprehensive monitoring features.
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
112
Ranking in other categories
Cloud Monitoring Software (10th)
 

Mindshare comparison

As of November 2025, in the Network Monitoring Software category, the mindshare of Nagios Core is 2.3%, down from 3.1% compared to the previous year. The mindshare of PRTG Network Monitor is 3.9%, 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 Monitor3.9%
Nagios Core2.3%
Other93.8%
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.
madhan kumar hs - PeerSpot reviewer
Alerting precision has reduced incident response times and improved department-level network visibility
The auto-pause sensor during the maintenance window is good without any false alerts, and it prevents me from getting flooded with alerts during planned maintenance, helping department heads understand their own network usage better. It has reduced incident response time by giving clearer ownership of each alert, ensuring alerts go to the proper recipient. SNMP testers and auto-pause are among the best features of PRTG Network Monitor, which is particularly useful for different departments such as HR and finance, where alerts can be filtered accordingly. The alerting features and dashboard of PRTG Network Monitor are very helpful, especially in our industry. However, the dashboard can look cluttered on smaller screens, which is one negative aspect. PRTG Network Monitor has impacted us positively; we have stopped getting flooded with alerts during planned maintenance or unplanned outages. Compared to others, this gives specific alerts very quickly and helps department heads understand their own network usage better, thus reducing incident response time so that each alert has clear ownership.
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
13%
Manufacturing Company
9%
Comms Service Provider
9%
Government
9%
Computer Software Company
12%
Government
8%
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 Business59
Midsize Enterprise19
Large Enterprise45
 

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.
What is your experience regarding pricing and costs for PRTG Network Monitor?
My experience with pricing, setup cost, and licensing for PRTG Network Monitor is that it is reasonable.
 

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: November 2025.
872,846 professionals have used our research since 2012.