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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 has a wide variety of plugins in existence, but when there's no plugin available it is quite simple to integrate one's own programs and scripts."
"An excellent solution that is easy and intuitive to implement."
"It's an essential part of our infrastructure, and we'll keep using it."
"Nagios has good scalability."
"Nagios is the best software of its kind if you have time for configure any host and network, and you can do quite everything with a bit of scripting."
"They have very accurate and fast support."
"Nagios XI simplifies our setup and reduces the time spent configuring monitoring tools."
"I really found Nagios a perfect fit for us and a good product to work with."
"The product has allowed us to have a recording of all business critical network data."
 

Cons

"WebUI should be improved (visual aspect) and should incorporate non-relational databases."
"If you are monitoring network devices, often it's not scaled for large corporations. Definitely, a minus in that area."
"I think that the community needs to concentrate development to get a standard GUI (Adagios is a side project) and gives the user a better notification system."
"Its simple deployment but complexity comes once you have to import more plugins."
"Technical support is very good but is very expensive. It is becoming more and more expensive just like the upgrade."
"I would like to see more customization in the network map because it is a bit tricky to use it."
"The GUI could be improved."
"The tool's AI model needs to be fixed."
"Customer service was below average and the local value added reseller did not know the product very well."
 

Pricing and Cost Advice

"We are using the free version of this solution."
"Licensing costs are reasonable."
"You can grow into the higher-priced scale as they learn how to utilize the features for Nagios XI."
"The pricing is high with separate licensing for the product and support."
"Nagios Core does not have any payment, but Nagios XI requires payment for the license."
"Nagios XI is open source."
"Nagios XI is an expensive solution."
"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."
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.