Nagios XI vs PRTG Network Monitor vs Zenoss Cloud comparison

Nagios and Paessler GmbH are both solutions in the Network Monitoring Software category. Nagios is ranked #15 with an average rating of 6.8, while Paessler GmbH is ranked #5 with an average rating of 8.6. Nagios holds a 2.4% mindshare in NMS, compared to Paessler GmbH’s 2.7% mindshare. Additionally, 83% of Nagios users are willing to recommend the solution, compared to 92% of Paessler GmbH users who would recommend it.

Nagios XI

Read 58 Nagios XI reviews

12,822 Views
8,719 Comparison Views

83% willing to recommend

PRTG Network Monitor

Read 113 PRTG Network Monitor reviews

15,821 Views
11,075 Comparison Views

92% willing to recommend

Zenoss Cloud

Read 8 Zenoss Cloud reviews

5,134 Views
2,464 Comparison Views

100% willing to recommend

Nagios XI

PRTG Network Monitor

Zenoss Cloud

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Executive Summary

We performed a comparison between Nagios XI, PRTG Network Monitor, and Zenoss Cloud based on real PeerSpot user reviews.

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Network Monitoring Software

May 2026

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Review summaries and opinions

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

Mindshare comparison

As of June 2026, in the Network Monitoring Software category, the mindshare of Nagios XI is 2.4%, down from 3.2% compared to the previous year. The mindshare of PRTG Network Monitor is 2.7%, down from 4.3% compared to the previous year. The mindshare of Zenoss Cloud is 0.8%, up from 0.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Network Monitoring Software Mindshare Distribution
Product	Mindshare (%)
PRTG Network Monitor	2.7%
Nagios XI	2.4%
Zenoss Cloud	0.8%
Other	94.1%

Network Monitoring Software

Featured Reviews

Emmanuel Appiah Boateng

Network and Security Engineer at a educational organization with 1,001-5,000 employees

Simplifies setup and requires user interface enhancement

Nagios XI is easy to install, which sets it apart from other open-source solutions I've tried. Typically, setting up a monitoring system on Linux involves cloning files from GitHub, building it, and installing many dependencies, but with Nagios XI, it wasn't like that. Nagios XI simplifies our setup and reduces the time spent configuring monitoring tools.

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madhan kumar hs

software engineer at Capgemini

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.

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ClaudiaChen

Cloud Architect - Senior Technology Architect at Telstra

Generates close to real-time alerts so users can resolve issues, but needs more integration and public cloud monitoring features

As Zenoss Service Dynamics is more for network-centric devices and you want to monitor, for example, a server, its services, IP addresses, and interfaces, if it's a network and you're going to monitor multiple items, you'll be charged multiple times. This is what Zenoss Service Dynamics needs to improve to make sure that customers pay just one fee to monitor the entire server. What I'd like to see in Zenoss Service Dynamics in the future is a public cloud monitoring feature, particularly for the Azure public cloud. Another additional feature I'd like to see in the next release of the solution is integration with the Azure public cloud because I know that there are some services from Azure that Zenoss Service Dynamics is currently unable to monitor.

Read full review

Quotes from Members

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

Pros

"The most useful aspect of this solution is the ability to customize it for the client agent."

"It's very easy to install it and manage it with Nagios XI's interface."

"The ROI is very good."

"Nagios XI is a simple monitoring tool with performance management and everything a standard monitoring tool provides."

"The features I've found the most useful are the plug-ins, the fact that you can connect almost everything to it. That's very useful."

"The dashboard allows you to see what's going on in the overall system."

"Simplicity of configuration; I can set up configuration of 100 devices with about 10 services in one to two days."

"This is a very good solution and it is simple to use, for any company."

More Nagios XI pros

"We have been extremely satisfied with PRTG's capabilities overall."

"PRTG Network Monitor is easy to set up. Within a few minutes, it is operational."

"I found PRTG Network Monitor very useful for troubleshooting and monitoring the utilization of either the network or server."

"It is a very stable solution. There are no bugs, glitches and we have not experienced any crashing."

"I would recommend this solution because it's great for monitoring network traffic and producing reports."

"We use the remote probes a lot for our branch offices. Instead of deploying the full instance of PRTG, we'll put a remote probe out there. This simplifies the whole deployment for us."

"It is user-friendly. It is easy to set up health checks within PRTG and use scans. It is like a self-service tool, and anyone can configure their own settings within PRTG."

"We like the alerting system, the SNMP monitoring and the customization of the bandwidth."

More PRTG Network Monitor pros

"It is very cost-effective compared to the tools I worked with in the past."

"The product offers good documentation that helps with initial training."

"The most valuable feature is the flexible discovery mechanism."

"Overall, it's a great solution, and I consider it to be one of the best."

"What I like most about Zenoss Service Dynamics is that it monitors the devices and gives close to real-time alerts. For example, in case the device is not available, Zenoss Service Dynamics generates an alert so my team can resolve the issue."

"With this solution, they can have one million users at the same time with no crashes."

"It is the most flexible solution of this type, but it takes time to adapt."

"Its Docker Container concept is mind blowing. It is the first monitoring tool which comes with Docker features."

More Zenoss Cloud pros

Cons

"We often need to develop custom plugins to get Nagios to work the way we want it to work because the features we need are not always available in Nagios."

"WebUI should be improved (visual aspect) and should incorporate non-relational databases."

"From an alerting point of view, some graphics and metrics don't work properly with Nagios XI as they do with Checkmk."

"The Configuration Wizard needs improvement, because not all vendors are present."

"There are stability issues if you have a large number of hosts and services."

"The product could be optimized to improve the administrative user experience via the Nagios Core Configuration (NCC) GUI module."

"The way Nagios displays information isn't easy for a new user to understand. It's not intuitive enough. You need to read some tutorials or be trained to understand what it's displaying. Also, I think it needs more features to improve network visibility because there are some things you can't detect."

"As it is open-source, it is not user-friendly. Open-source software is usually not user-friendly."

More Nagios XI cons

"PRTG Network Monitor can be improved as there is a lot of manual cleanup needed, which could be reduced."

"I wouldn't mind better categories for the sensors. When I go to add a new sensor for a new device, there are some categories in there already, and they can be filtered out, but there's quite a large pool of sensors... When I want to go in and find something quite specific, I have got to scroll down and scroll down to find what I'm actually looking for,"

"I have an issue with DFS, distributed file services... there isn't one by default. Taking into account the difference between DFS and DFSR as well would be great."

"Technical support is an area with concerns in PRTG Network Monitor, where improvements are required."

"For smaller networks, I would recommend this solution. That said, if the network is complex, I would recommend a company evaluates another product instead."

"The technical support could respond a little bit quicker."

"The licensing policy needs more flexibility."

"It would be good if there were better graphical interfaces when you have it on multiple monitors... Because we have so many servers, things can get lost in the fog a little bit. Maybe having a better way of showing different geographies, Flash, etc., would help."

More PRTG Network Monitor cons

"The inclusion of a feature to show a graphical view of the network would be a helpful improvement."

"There is room for improvement with the administrative part. They introduced Control Center to manage things in Zenoss 5. The services that Zenoss provides remained the same, but the administrative part, since they introduced Docker, etc., has become a little complex"

"This solution is complex for beginners so it takes some time to learn."

"It would be ideal if the product offered sound alerts."

"Technical support is 3/10, poor: Incomplete and poor documentation Undocumented processes Inconsistent solutions to problems depending on source"

"There was a problem with Zenoss and storage monitoring."

"Now it is stable, but they should design threshold parameters in percentage instead of raw values."

"The AI aspect needs to improve."

More Zenoss Cloud cons

Pricing and Cost Advice

"Licensing costs are reasonable."

"As it is not an agentless tool, I think it is expensive."

"We are using the free version of this solution."

"You can grow into the higher-priced scale as they learn how to utilize the features for Nagios XI."

"It is good to contact experts for advice about what is the best solution for your specific infrastructure and enterprise."

"Nagios Core does not have any payment, but Nagios XI requires payment for the license."

"This solution is very expensive, at approximately $5,000 USD when I purchased it, which is why I haven't upgraded my version in several years."

"The licensing fees for this solution are approximately $3,000 USD per year."

More Nagios XI pricing and cost advice

"It is about £4,500 for the first year, then about another 15 to 20 percent annually after that. So, we are looking at about £1000 running costs a year. When you think about how much an outage costs per minute, it's negligible."

"At the moment I'm only using 500 sensors. I pay yearly, so it's a cost that's easily swallowed."

"Cost was a factor when selecting this solution, but it just did everything we wanted it to do."

"We bought a license for 4000 sensors."

"When you have a lot of devices, PRTG Network Monitor can be costly."

"I would like better pricing models for smaller businesses. The free version is fantastic, but it's too restrictive. If they could just get up to 200 sensors for a reasonable fee for on-premise, I would give PRTG my credit card right now."

"Our licensing costs are 10,000 euros over three years."

"The price was pretty good, very competitive."

More PRTG Network Monitor pricing and cost advice

"The pricing depends on the environment, the number of services, and the size of the data center. It can go from $100,000 to a million dollars."

"There are additional costs you'll have to pay apart from the license fee for Zenoss Service Dynamics. I can't remember exactly how much my company is paying because I don't handle the finance part, but the cost is paid annually. On a scale of one to five, with one being the cheapest and five being the most expensive, I'm rating the solution three out of five."

"It is very cost-effective compared to the tools I worked with in the past. The company is gaining a lot with respect to the cost factor. It provides agentless monitoring and in a very cheap way."

"It depends on the customer, what he wants."

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Comparison Review

it_user174738

IT Developer at a tech services company with 51-200 employees

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…

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Top Industries

By visitors reading reviews

Financial Services Firm

10%

Construction Company

Manufacturing Company

Comms Service Provider

Financial Services Firm

10%

Comms Service Provider

Computer Software Company

Manufacturing Company

Construction Company

12%

Manufacturing Company

11%

Comms Service Provider

10%

Transportation Company

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	22
Midsize Enterprise	17
Large Enterprise	21

By reviewers
Company Size	Count
Small Business	60
Midsize Enterprise	19
Large Enterprise	50

By reviewers
Company Size	Count
Small Business	4
Large Enterprise	5

Questions from the Community

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.

See all answers

What needs improvement with Nagios XI?

The user interface needs improvement. Many tools have poor user interfaces, making them hard to manage and navigate.

See all answers

What is your primary use case for Nagios XI?

I normally use Nagios XI for our servers. It's not particularly used for network equipment, however, I use it for mon...

See all answers

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...

See all answers

What is your experience regarding pricing and costs for PRTG Network Monitor?

The pricing was higher at the beginning, but the recurring licensing cost is affordable and reasonable. Overall, the ...

See all answers

What needs improvement with PRTG Network Monitor?

The reporting features look very technical and that can be improved. If they can change the report so everyone can un...

See all answers

What is the best network monitoring software for large enterprises?

In my experience, I worked with many monitoring software, but the one that gave me the most functionalities of a larg...

See all answers

Comparisons

Zabbix vs Nagios XI

Compared 5% of the time

DX Spectrum vs Nagios XI

Compared 4% of the time

SolarWinds NPM vs Nagios XI

Compared 4% of the time

Opsview vs Nagios XI

Compared 3% of the time

Icinga vs Nagios XI

Compared 2% of the time

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Zabbix vs PRTG Network Monitor

Compared 4% of the time

Centreon vs PRTG Network Monitor

Compared 4% of the time

SolarWinds NPM vs PRTG Network Monitor

Compared 3% of the time

WhatsUp Gold vs PRTG Network Monitor

Compared 3% of the time

Opsview vs PRTG Network Monitor

Compared 2% of the time

More PRTG Network Monitor Competitors

Zabbix vs Zenoss Cloud

Compared 6% of the time

Microsoft System Center vs Zenoss Cloud

Compared 3% of the time

Dynatrace vs Zenoss Cloud

Compared 3% of the time

ScienceLogic vs Zenoss Cloud

Compared 3% of the time

Gigamon Deep Observability Pipeline vs Zenoss Cloud

Compared 2% of the time

More Zenoss Cloud Competitors

Product Reports

Buyer's Guide

Nagios XI

June 2026

Download Nagios XI product report

Buyer's Guide

PRTG Network Monitor

June 2026

Download PRTG Network Monitor product report

Buyer's Guide

Zenoss Cloud

May 2026

Download Zenoss Cloud product report

Also Known As

No data available

Cloud Monitoring, Zenoss Service Dynamics

Overview

Nagios XI offers powerful monitoring with customizable scripts and extensive plugin support, making it ideal for those overseeing IT services and infrastructure. It features an intuitive dashboard, real-time alerts, and comprehensive device support, ensuring flexible and scalable network monitoring.

Nagios XI stands out due to its robust monitoring capabilities, emphasizing flexibility and vast plugin support for custom scripts and service monitoring. Users value its intuitive dashboard for real-time alerts and device compatibility, which simplifies installation and enhances scalability and network visualization. Its open-source foundation assures performance and stability, while a setup wizard aids initial configuration. Despite its strengths, Nagios XI could benefit from a more user-friendly interface, enhanced installation processes, better network map customization, improved cloud integration, and alerting capabilities. Users often face hurdles with its scalability, configuration management, and reporting flexibility, and enterprise clients desire improved dashboards, clustering support, and AI integration.

What are some key features of Nagios XI?

Monitoring Capabilities: Offers comprehensive monitoring for networks, servers, and IT services.
Plugin Support: Supports a wide range of plugins, enabling custom script creation for diverse monitoring needs.
Intuitive Dashboard: Provides real-time alerts and a user-friendly display.
Scalability: Supports growth with robust scalability and network visualization capabilities.
Open-Source Performance: Benefits from an open-source framework, ensuring performance and stability.

What are the potential benefits and ROI?

Comprehensive Monitoring: Enables thorough oversight of IT services and infrastructure.
Customizability: Allows for tailored solutions via plugins and scripts.
Real-Time Alerts: Provides immediate notification of system issues.
Ease of Installation: Simplified processes through the setup wizard.
Scalable Solutions: Adapts to growing organizational needs, enhancing long-term use and support.

Nagios XI is widely used in monitoring network servers, infrastructure environments, and IT services. Organizations rely on Nagios XI for comprehensive monitoring of hardware, memory storage, CPUs, databases, services, and applications. It's frequently implemented to manage multiple servers, routers, switches, modems, and power supplies, and integrates with virtual and cloud servers. By supporting custom scripts and data collection, it allows for effective alerts and notifications for network and equipment statuses across various sectors.

Nagios

PRTG Network Monitor offers seamless network health tracking with flexible alerting and robust scalability. Its real-time monitoring and compatibility across diverse technologies enhance operational efficiency.

PRTG Network Monitor stands out by providing intuitive dashboards and detailed reporting to efficiently monitor network health, significantly reducing manual checks. Its quick setup and comprehensive compatibility cater to diverse environments. The alert system and real-time monitoring enable proactive maintenance, while custom scripting and a broad range of sensors allow for personalized monitoring options. Enhancements are suggested in database management, integration capabilities, Unix support, pricing, application performance, and dashboard customization. Users benefit from enhanced error messaging, flexible licensing, and better training resources.

What are the key features of PRTG Network Monitor?

Ease of Use: Intuitive dashboard makes network monitoring straightforward.
Flexible Alerting: Provides prompt notifications for proactive maintenance.
Scalability: Adapts to various network sizes and complexities.
Compatibility: Works across diverse technologies and environments.
Custom Scripting: Allows tailored monitoring options for specific needs.

What benefits should users seek in PRTG Network Monitor reviews?

Operational Efficiency: Reduces the need for manual network checks.
Real-Time Monitoring: Enables instant response to potential issues.
Enhanced Infrastructure Oversight: Facilitates comprehensive management of network devices.
Proactive Maintenance: Alerts help prevent potential disruptions.
Central Dashboard: Manages infrastructure across multiple locations effectively.

In industries like IT, telecommunications, and healthcare, PRTG Network Monitor is employed for comprehensive monitoring of systems, servers, and networks. It assists in tracking uptime, connectivity, and alerts for potential issues, offering tailored options like monitoring traffic flows and hardware health through custom sensors and scripts.

Paessler GmbH

Zenoss Cloud provides a comprehensive overview of IT environments, supporting cross-cloud functionality, scalability, and robust integrations. It offers dynamic monitoring through its intuitive dashboard and supports hybrid deployments across cloud and on-premises infrastructures.

Zenoss Cloud enables users to monitor network infrastructure and operator platforms efficiently. With features like agentless monitoring and real-time alerts, Zenoss Cloud integrates seamlessly with external systems such as ITSM tools. Its flexible functionality allows for the management of both on-premises and cloud infrastructures like AWS and Azure. Users benefit from easy setup and strong technical support, although they seek enhancements in AI capabilities and simpler installation. The pricing model and complexity for beginners and storage monitoring are areas for improvement.

What are the key features of Zenoss Cloud?

Dynamic Monitoring: Enhances user experience with real-time insights.
Cross-Cloud Functionality: Supports hybrid deployments across AWS and Azure.
Agentless Monitoring: Simplifies deployment with minimal overhead.
Scalability: Grows with your network's demands.
Custom Integration: Supports notifications and alerts tailored to user requirements.

What benefits should users expect from Zenoss Cloud?

Time Efficiency: Quick setup and operation save resources.
Comprehensive Support: Extensive documentation streamlines troubleshooting.
Cost-effective Monitoring: Prevents multiple charges in server monitoring.
Enhanced User Experience: Offers seamless integration with existing IT infrastructures.

Zenoss Cloud is widely used in monitoring solutions for industries including technology and data centers. It supports direct monitoring of systems like vSphere and NetApp, making it ideal for IT operations and managed services. Integration with tools such as ServiceNow and SolarWinds aligns it with diverse IT environments.

Zenoss

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

2degrees, Rackspace, State of North Dakota, El Paso Independent School District, NWN Corporation

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May 2026

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