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Nagios XI vs Network Instruments Observer comparison

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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:
 

Categories and Ranking

Nagios XI
Ranking in Network Monitoring Software
15th
Average Rating
8.0
Reviews Sentiment
6.8
Number of Reviews
58
Ranking in other categories
Server Monitoring (9th), IT Infrastructure Monitoring (11th), Cloud Monitoring Software (21st)
Network Instruments Observer
Ranking in Network Monitoring Software
106th
Average Rating
0.0
Number of Reviews
1
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of November 2026, in the Network Monitoring Software category, the mindshare of Nagios XI is 2.5%, down from 2.8% compared to the previous year. The mindshare of Network Instruments Observer is 0.3%, up from 0.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Network Monitoring Software Mindshare Distribution
ProductMindshare (%)
Nagios XI2.5%
Network Instruments Observer0.3%
Other97.2%
Network Monitoring Software
 

Featured Reviews

Emmanuel Appiah Boateng - PeerSpot reviewer
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.
reviewer197955 - PeerSpot reviewer
Engineer at a comms service provider with 11-50 employees
The product has allowed us to have a recording of all business critical network data.
Ring capture buffer. Complex filtering The product has allowed us to have a recording of all business critical network data. The Observer application is very complex to use and setup, this should be improved. Windows is unstable, a possible Linux version in future will fix this. 4 years The…

Quotes from Members

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

Pros

"It's an essential part of our infrastructure, and we'll keep using it."
"Nagios XI is easy to install, which sets it apart from other open-source solutions I've tried."
"In my experience with Nagios, I've found that the most valuable features are the scalability and extensibility through using scripts."
"The most valuable features of Nagios XI are you can customize it based on your use case and requirements, it is flexible and easy to integrate with our systems, and you can customize the solution by adding additional features using code."
"It's very easy to install it and manage it with Nagios XI's interface."
"The integration with the alerting software, automated maintenance windows, and the ability to set up templates and groups of checks, as well as customize the checks themselves, are very valuable features."
"All of them, but mainly: Highly-efficient server performance monitoring engine Configuration wizards Infrastructure management Configuration snapshot."
"Nagios is my favourite open source monitoring system."
"The product has allowed us to have a recording of all business critical network data."
 

Cons

"There's no convenient way to manage notes as the only way is to manage them through the database."
"We'd like to see more integration capabilities."
"I would like to see more customization in the network map because it is a bit tricky to use it."
"The reporting structure could be more streamlined."
"Adding new servers and passive checks (which require setting up agents and NRDS) on servers are a little difficult to do properly when employees don't understand the process."
"We're still experiencing stability issues with regards to collecting performance graphs."
"For some, it may be difficult to deploy."
"The scalability of Nagios XI is scalable. However, it is not easy to do."
"Customer service was below average and the local value added reseller did not know the product very well."
 

Pricing and Cost Advice

"The pricing is high with separate licensing for the product and support."
"Nagios XI is an expensive solution."
"The licensing fees for this solution are approximately $3,000 USD per year."
"The pricing is really cost efficient. The licensing is perpetual and can be renewed very easily."
"It is good to contact experts for advice about what is the best solution for your specific infrastructure and enterprise."
"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."
"Nagios XI is open source."
"As it is not an agentless tool, I think it is expensive."
Information not available
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Comparison Review

it_user174738 - PeerSpot reviewer
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…
 

Top Industries

By visitors reading reviews
Comms Service Provider
11%
Outsourcing Company
9%
Financial Services Firm
8%
Manufacturing Company
8%
No data available
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business22
Midsize Enterprise17
Large Enterprise21
No data available
 

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.
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 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 monitoring our server performance, including CPU, memory, data, and services runnin...
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Overview

 

Sample Customers

Nagios has over one million users globally, including AOL, DHL, McAfee, MCI, MTV, Yahoo!, Universal, Toshiba, Sony, Siemens, and JPMorgan Chase.
Brno University of Technology
Find out what your peers are saying about Zabbix, Auvik, SolarWinds and others in Network Monitoring Software. Updated: October 2026.
920,769 professionals have used our research since 2012.