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Nagios XI vs PRTG Network Monitor vs ThousandEyes comparison

 

Comparison Buyer's Guide

Executive Summary

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
6.6
Nagios XI enhances efficiency and time management but concerns about increased costs affect ROI perception across organizations.
Sentiment score
6.9
PRTG Network Monitor boosts ROI by enhancing time efficiency, reducing staff needs, preventing failures, and offering cost-effective management.
Sentiment score
8.1
Users commend ThousandEyes for its effective ROI, cost-saving benefits, and high impact on network performance and issue resolution.
 

Customer Service

Sentiment score
6.5
Nagios XI support is mixed; praised for responsiveness but criticized for high cost, complex licensing, and delayed responses.
Sentiment score
6.8
Users appreciate PRTG's intuitive design, often resolving issues via resources, despite email-only support and mixed service feedback.
Sentiment score
7.9
ThousandEyes' customer service is praised for effective support and prompt response times, though some seek faster responses.
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 contacted the support team, and they resolved it within a couple of hours.
 

Scalability Issues

Sentiment score
7.1
Nagios XI is scalable for small to medium environments but faces challenges in large infrastructures and cloud adaptability.
Sentiment score
7.3
PRTG Network Monitor is highly scalable, allowing seamless expansion with added sensors or licenses, despite potential hardware limitations.
Sentiment score
7.3
ThousandEyes scales effectively across industries, supporting diverse enterprises effortlessly, though costs may rise with added agents.
If the user interface isn’t presenting data well, it becomes difficult to manage when scaling.
PRTG Network Monitor has the ability to scale and add new devices.
On a scale of one to ten, scalability is rated as 9.5.
For less than one hundred devices, it is stable.
 

Stability Issues

Sentiment score
7.3
Nagios XI is stable, but large deployments may experience performance issues, database problems, and minor network dependencies.
Sentiment score
7.9
PRTG Network Monitor is praised for its stability and reliability, with issues often due to user errors or limits.
Sentiment score
8.3
ThousandEyes is stable and reliable, with smooth operation, minor bugs typical, and effective issue management ensures user satisfaction.
 

Room For Improvement

Nagios XI's interface is outdated, lacks scalability, needs better cloud integration, APIs, automation, and improved documentation.
PRTG users seek enhancements in dashboards, cloud integration, application speed, support, reporting, pricing, and sensor expansion.
ThousandEyes should improve server monitoring, integration, AI, UI, compatibility, documentation, and reduce operational noise for enhanced user experience.
Many tools have poor user interfaces, making them hard to manage and navigate.
The GUI could be improved. It's a bit too basic.
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.
Having a dedicated incident alert system for URL alerts would help manage noise and streamline operations, especially during patch upgrades.
 

Setup Cost

Nagios XI provides cost-efficient enterprise-level monitoring with reasonable pricing, appreciated for its features and open-source options.
PRTG Network Monitor provides flexible, cost-effective licensing for enterprises, appealing for intuitive setup and competitive pricing against other solutions.
ThousandEyes pricing varies; some see it as expensive, favoring large enterprises, with potential monthly fee shifts.
We are using the free, open-source version.
The pricing for the Nagios XI product is good and better than other solutions.
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 XI provides customizable, flexible, and scalable IT infrastructure monitoring with real-time alerts and extensive plugin support.
PRTG Network Monitor is praised for its scalability, user-friendly interface, real-time monitoring, and seamless integration across various technologies.
ThousandEyes provides comprehensive network monitoring, detailed analysis, user-friendliness, scalability, and integration, aiding efficient troubleshooting and operational enhancement.
Nagios XI simplifies our setup and reduces the time spent configuring monitoring tools.
The alerting system is very effective.
PRTG Network Monitor already provided me with 100 free sensors, which is enough for my network monitoring.
It is advantageous because it can be deployed on-premises.
The pricing is affordable compared to SolarWinds.
I find the most valuable feature of ThousandEyes is the ability to directly see the client's exact issue.
 

Mindshare comparison

As of May 2025, in the Network Monitoring Software category, the mindshare of Nagios XI is 3.2%, down from 4.1% compared to the previous year. The mindshare of PRTG Network Monitor is 4.3%, down from 4.8% compared to the previous year. The mindshare of ThousandEyes is 3.6%, down from 4.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Network Monitoring Software
 

Featured Reviews

Amir  Said - PeerSpot reviewer
Effective alerting enhances network monitoring experience with an easy setup
We love Nagios XI due to the fact that JPS Web is very useful. JPS monitors the modem and performs switching, monitoring the computer, and performing switching. We implement some applications and traffic monitoring. The alerting system is very effective. For instance, if we have an alarm on some RAM storage if the traffic is cut or dropped.
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…
Satyavrat Nirala - PeerSpot reviewer
Offers user monitoring and Internet insights and include customer journeys
It’s evolving; I feel it needs more holistic integration. It needs more improvement. It’s very good, but the integration can be slightly complicated on different platforms. I used it for a healthcare organization, and the integration was slightly challenging. In future releases, I would like to explore AI capabilities. AI would be more valuable because it works across different cloud and server systems. It looks into issue detection and insight modeling, so that is something I feel will be very helpful in the near future. More AI because of compliance and other challenges, not because of the product challenge. It’s about regulations, and we have HIPAA laws in the US and many different kinds of laws. Because of that, these specific elements and certain units don’t allow the tooling system to be fully utilized. We also support a certain segment of healthcare, which is the army healthcare segment, which is more government-controlled. There are certain restrictions in moving into the cloud. That’s where I thought those elements might need some more improvement. Also, looking into how we’ll be able to use more data visualization. It has it, but it doesn’t give you everything. If you look into the elements of use and so many other elements are there, but the UI/UX also has to be improved a bit, I feel. From a developer’s standpoint, it’s very easy, but from a consultant’s standpoint, there can be more enhancement, like one-click view and one-click report generation. Those things should be more seamless.
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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
Educational Organization
46%
Computer Software Company
8%
Financial Services Firm
7%
Manufacturing Company
5%
Educational Organization
45%
Computer Software Company
9%
Government
6%
Financial Services Firm
6%
Computer Software Company
20%
Financial Services Firm
13%
Manufacturing Company
8%
Government
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Nagios XI?
It is an open-source platform with valuable features for performance and stability.
What is your experience regarding pricing and costs for Nagios XI?
The pricing for the Nagios XI product is good and better than other solutions. I would give it a four or five.
What needs improvement with Nagios XI?
The user interface needs improvement. Many tools have poor user interfaces, making them hard to manage and navigate.
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 a...
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?
The pricing is in the middle. It's not too high, nor too low, but it's reasonable.
What is the best network monitoring software for large enterprises?
It actually depends on the exact purpose or requirements. Some tools are better for only network devices while others...
What needs improvement with ThousandEyes?
ThousandEyes could improve by implementing a similar incident management system like BigPanda ( /products/bigpanda-re...
 

Overview

 

Sample Customers

Nagios has over one million users globally, including AOL, DHL, McAfee, MCI, MTV, Yahoo!, Universal, Toshiba, Sony, Siemens, and JPMorgan Chase.
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
Wayfair, GitHub, Craigslist, Comcast, SurveyMonkey, Lyft, Box, HP, Zendesk, IO Data Centers, Good Technology, NNTCommunications, Proofpoint, Schneider, Crowdstrike, Avera, Pitney Bowes, InstartLogic, Shutterfly, Shutterstock, Condé Nast, Roche, Jive, Actelion, Brocade, Infor, Okta, JLL, DigitalOcean, Zuora, NetSuite, CloudFlare, One, DemonWare, Quantcast, Carbonite, CareerBuilder, Prosper, Oscar, Slack
Find out what your peers are saying about Zabbix, Auvik, Datadog and others in Network Monitoring Software. Updated: April 2025.
852,764 professionals have used our research since 2012.