Nagios Core vs OP5 Monitor comparison

Nagios and ITRS are both solutions in the Network Monitoring Software category. Nagios is ranked #12 with an average rating of 8.2, while ITRS is ranked #72. Nagios holds a 2.9% mindshare in NMS, compared to ITRS’s 0.7% mindshare. Additionally, 80% of Nagios users are willing to recommend the solution, compared to 100% of ITRS users who would recommend it.

Nagios Core

Read 51 Nagios Core reviews

4,123 Views
1,862 Comparison Views

80% willing to recommend

OP5 Monitor

Read 6 OP5 Monitor reviews

1,073 Views
554 Comparison Views

100% willing to recommend

Nagios Core

OP5 Monitor

Comparison Buyer's Guide

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Executive SummaryUpdated on Oct 9, 2024

Nagios Core and OP5 Monitor are competing solutions in network monitoring. OP5 Monitor is favored for its comprehensive features and user-friendly setup, though Nagios Core has more favorable pricing.

Features: Nagios Core offers an extensive plugin architecture for customization, system integration capabilities, and flexibility for IT professionals. OP5 Monitor provides advanced scalability, sophisticated visualization tools, and an enhanced user-friendly setup, attracting large enterprises needing detailed analysis.

Room for Improvement: Nagios Core could improve by simplifying its setup process, enhancing user interface design, and providing more customer support options. OP5 Monitor could benefit from a more competitive pricing model, additional customization features, and improving its open-source accessibility for community-driven enhancements.

Ease of Deployment and Customer Service: Nagios Core features a manual setup process, which offers flexibility but can be time-consuming, even providing basic support through community resources only. OP5 Monitor offers a streamlined installation with comprehensive support options, reducing troubleshooting time and facilitating easier onboarding.

Pricing and ROI: Nagios Core is open-source, minimizing initial costs, though it may incur higher long-term management expenses due to customization needs. OP5 Monitor requires a higher initial investment but presents a solid ROI through its efficiency and full feature set, appealing to organizations seeking expansive monitoring with quick returns.

To learn more, read our detailed Nagios Core vs. OP5 Monitor Report (Updated: May 2025).

Buyer's Guide

Nagios Core vs. OP5 Monitor

May 2025

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Helped 855,266 peers since 2012

Review summaries and opinions

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

Categories and Ranking

Nagios Core

Ranking in Network Monitoring Software

12th

Ranking in IT Infrastructure Monitoring

10th

Average Rating

8.2

Reviews Sentiment

7.0

Number of Reviews

Ranking in other categories

No ranking in other categories

OP5 Monitor

Ranking in Network Monitoring Software

72nd

Ranking in IT Infrastructure Monitoring

53rd

Average Rating

8.6

Reviews Sentiment

6.7

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of June 2025, in the Network Monitoring Software category, the mindshare of Nagios Core is 2.9%, down from 3.1% compared to the previous year. The mindshare of OP5 Monitor is 0.7%, down from 0.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Network Monitoring Software

Featured Reviews

Nishith-Vyas

Tech Lead at STL Digital Limited

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.

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Harish Venkateshappa

Information Technology Staff at GlobalFoundries

Useful online resources, customizable, and highly effective monitoring

The solution is useful for tweaking. However, there have been some negative experiences, such as limited report capabilities. The only report available is in PDF format, making it difficult for teams managing multiple servers to extract data in Excel format. The speaker recommends that the team improve the report capabilities to better serve users. If there are corrupt files the data can be extracted from them. Anyone who wants to see the performance of memory usage, such as whether it's at 80 to 90 percent, can use this tool. However, other tools can provide this information in two minutes, this tool is more time-consuming and the report it provides is not very effective for practical use. When it comes to reports, the tool falls short. During a recent call, it was noted that while the company has distributed servers across the globe, only the master server can accommodate the reports and events, causing delays. If other servers experience issues, the team cannot view the reporting or tag things, such as for troubleshooting purposes. If this aspect was improved it would be an excellent tool.

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Quotes from Members

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

Pros

"The reporting structure and the feature set are valuable to me."

"Nagios monitors our servers, so we know if anything goes wrong and can solve the problem before it happens."

"The notifications are definitely one of the most valuable features of Nagios Core. We know what to look for and what to expect when things are down."

"What I like about Nagios Core is that it helps me ensure everything is running smoothly by checking the status of hosts and services."

"Other products are good but from the configuration point of view Nagios is really very lightweight. The price is really good in my opinion. Another important thing is that my Nagios engine still works with Dual core 8GB ram for the last 10 years."

"I like that it's very simple to install, easy to manage and deploy, and easy to use for monitoring."

"The most valuable feature of Nagios Core is the ability to check the availability of the server for network connectivity. Additionally, the interface is good."

"Nagios Core is stable."

More Nagios Core pros

"It monitors and continuously tests everything that is of importance to you and your users. It could be everything from monitoring disk space to CPU usage to memory. It could include determining if the response time in your e-commerce platform is quick enough, or whether you have too many bounces from some of the pages on your website. You want to monitor anything that could cost you money or time or resources. You can do that with this system. It's very flexible."

"OP5 Monitor is a great choice due to its being built on an open-source monitoring tool and provides ample opportunity for customization based on specific support requirements. It is also user-friendly and easy to manage with a wide range of plugins available for use. In comparison to other enterprise tools, such as Micro Focus, OP5 Monitor stands out for its features and cost-effectiveness, making it the best tool in the market. Customization is one of the key strengths of the tool and provides a lot of capabilities. Additionally, it is easy to find support and plugins for the tool through online resources."

"With limited hardware or a virtual machine, you can address a huge network, hundreds of thousands of elements that need to be monitored. Other commercial software is not on that level."

"We can also observe whatever we want, and there are no limitations."

"The API makes it pretty easy to integrate with any system."

"The best feature is that it is very relatable, stable, and scalable. The logger is a part of the software, but it's not the most important point of it."

Cons

"The initial setup process could be easier."

"There is room for improvement in the graphics."

"Nagios Core is limited in terms of distributed setups, and there is no central view for remote data centers."

"The user interface could be more interactive because it is pretty basic."

"The interface could be improved."

"The core version is no match for the XI version."

"The UI is a little outdated and graphics could be displayed in a better way."

"I believe Nagios Core will need to provide an option for big data platforms in the future."

More Nagios Core cons

"The user interface is not what we are used to these days, and should be improved."

"We do not get performance reports properly."

"IT environments today are in constant flux. This is driven by the newer cloud technologies such as Kubernetes and Docker, etc. The whole Nagios-based monitoring system that OP5 is created on top of, is based on a host-service model. There is a need for a strategy on what to do with more dynamic environments. There is some cool stuff going on in that direction."

"OP5 lacks some visualization, a feature that makes some other products nice. Op5 is built for purpose, which is fine, but if you compare it with some new products, the visualization is not so appealing, especially for management... If you don't need fancy visualizations, OP5 is fine."

"The solution is useful for tweaking. However, there have been some negative experiences, such as limited report capabilities. The only report available is in PDF format, making it difficult for teams managing multiple servers to extract data in Excel format. The speaker recommends that the team improve the report capabilities to better serve users."

"They need to improve the dashboard interface."

Pricing and Cost Advice

"The product is cheaply priced."

"We have saved a lot of time, money, and effort in reducing disaster times, which is owed to Nagios quick alerting."

"Nagios Core is a cheap solution."

"It's free."

"I would rate the solution's pricing an eight out of ten."

"We are using the free version of Nagios Core."

"Nagios Core is free to use."

"Most the plugin features are free."

More Nagios Core pricing and cost advice

"The cost of the license and support are separate. If you want platinum call support, it will cost more than a regular call. I did not opt for it, as it is an additional cost."

"It was not expensive. And because it's less demanding in terms of hardware, you don't have to pay for another SQL or other database license, and you can have a huge installation on one machine..."

"OP5 has a very low price as a solution, compared to many other solutions out there."

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Top Industries

By visitors reading reviews

Computer Software Company

15%

Government

10%

Financial Services Firm

Manufacturing Company

Government

16%

Computer Software Company

13%

Financial Services Firm

10%

Aerospace/Defense Firm

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

No data available

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.

See all answers

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.

See all answers

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.

See all answers

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Comparisons

Icinga vs Nagios Core

Compared 25% of the time

Nagios XI vs Nagios Core

Compared 17% of the time

Zabbix vs Nagios Core

Compared 13% of the time

Centreon vs Nagios Core

Compared 8% of the time

Observium vs Nagios Core

Compared 3% of the time

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Zabbix vs OP5 Monitor

Compared 25% of the time

Opsview vs OP5 Monitor

Compared 19% of the time

PRTG Network Monitor vs OP5 Monitor

Compared 8% of the time

Checkmk vs OP5 Monitor

Compared 8% of the time

SolarWinds NPM vs OP5 Monitor

Compared 6% of the time

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Product Reports

Buyer's Guide

Nagios Core

May 2025

Download Nagios Core product report

Buyer's Guide

OP5 Monitor

May 2025

Download OP5 Monitor product report

Overview

This is IT infrastructure monitoring's industry-standard, open-source core. Free without professional support services.

Nagios

OP5 Monitor - The Complete Monitoring Solution

OP5 Monitor is a flexible and highly scalable monitoring solution for all sizes of environments. Use just one product to monitor your IT environment regardless of location, whether on-premise, in dynamic environments, public cloud or a hybrid of these.

Digital transformation adds extra layers and complexity to the IT estate by creating a hybrid IT environment of both static and dynamic environments, that can be difficult to monitor efficiently. ITRS OP5 Monitor gives enterprises full visibility over their entire IT estate through a single pane of glass, allowing them to consolidate monitoring tools and cut down costs.

ITRS

Sample Customers

Airbnb, Cisco, PayPal, FanDuel

Svenska Spel, Carus, VGL, Tele2, Viking Line, Clas Ohlson, Vanderlande, Försäkringskassan

Buyer's Guide

Nagios Core vs. OP5 Monitor

May 2025

Free Report: Nagios Core vs. OP5 Monitor

Find out what your peers are saying about Nagios Core vs. OP5 Monitor and other solutions. Updated: May 2025.

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