Nagios Core vs Observer GigaStor comparison

Nagios and Viavi Solutions are both solutions in the Network Monitoring Software category. Nagios is ranked #10 with an average rating of 8.7, while Viavi Solutions is ranked #86. Nagios holds a 1.9% mindshare in NMS, compared to Viavi Solutions’s 0.4% mindshare. Additionally, 80% of Nagios users are willing to recommend the solution, compared to 100% of Viavi Solutions users who would recommend it.

Nagios Core

Read 51 Nagios Core reviews

5,494 Views
4,505 Comparison Views

80% willing to recommend

Observer GigaStor

Read 7 Observer GigaStor reviews

1,238 Views
780 Comparison Views

100% willing to recommend

Nagios Core

Observer GigaStor

Comparison Buyer's Guide

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Executive SummaryUpdated on Oct 10, 2024

Observer GigaStor and Nagios Core compete in network monitoring and analysis. Observer GigaStor appears to have the advantage due to its comprehensive packet capture and support satisfaction.

Features: Observer GigaStor provides high-speed packet capture, detailed network performance analysis, and faster data retrieval. Nagios Core includes robust monitoring capabilities, flexible configuration options, and an open-source framework.

Room for Improvement: Observer GigaStor could reduce hardware complexity, enhance its user interface, and improve integration with third-party systems. Nagios Core could benefit from more official support, streamlined configuration processes, and enhanced out-of-the-box reporting tools.

Ease of Deployment and Customer Service: Observer GigaStor requires complex hardware setup but provides strong customer support for a smoother deployment experience. Nagios Core is simpler to deploy with minimal infrastructure requirements but predominantly relies on community support for assistance.

Pricing and ROI: Observer GigaStor has higher initial costs due to its hardware dependencies but offers substantial ROI through advanced features. Nagios Core's open-source nature results in lower expenses, presenting a cost-effective solution with significant customization potential.

To learn more, read our detailed Nagios Core vs. Observer GigaStor Report (Updated: March 2026).

Buyer's Guide

Nagios Core vs. Observer GigaStor

March 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:

Categories and Ranking

Nagios Core

Ranking in Network Monitoring Software

10th

Average Rating

8.2

Reviews Sentiment

7.3

Number of Reviews

Ranking in other categories

IT Infrastructure Monitoring (10th)

Observer GigaStor

Ranking in Network Monitoring Software

86th

Average Rating

9.0

Reviews Sentiment

8.1

Number of Reviews

Ranking in other categories

Network Troubleshooting (14th), Network Packet Broker (NPB) (9th)

Mindshare comparison

As of March 2026, in the Network Monitoring Software category, the mindshare of Nagios Core is 1.9%, down from 3.0% compared to the previous year. The mindshare of Observer GigaStor is 0.4%, up from 0.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Network Monitoring Software Mindshare Distribution
Product	Mindshare (%)
Nagios Core	1.9%
Observer GigaStor	0.4%
Other	97.7%

Network Monitoring Software

Featured Reviews

Husham Yaqoob

Senior System Administrator at Interactive Group

Monitoring solution provides comprehensive visibility across IT infrastructure

The good thing about Nagios Core is it covers everything. Everything in the IT domain, you can monitor anything. You can even monitor printers, the ports of printers, Core workstations, and storage. You can monitor the workflow Core and the utilization of computes. If you want to grasp everything of your IT equipment on a single interface, you can use Nagios. It's the best one. It provides dashboards, and you can also configure your emails and alerts with it. If something is critical, you can configure it to notify via emails. It has a very handy dashboard, providing live alerts and visibility for everything.

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Jeroen-Dubbelman

Director at Bitrate

Aids significantly in the threat-hunting process and provides a score-based evaluation of user experience

There are many valuable features, but understanding end-user response times stands out. It provides a score-based evaluation of user experience, helping customers quickly pinpoint whether issues originate from the network, server, client, or application. Additionally, it facilitates in-depth analysis of application dependencies. The retrospective network analysis capability of Observer GigaStor has been beneficial. It's a pivotal feature for network performance solutions. However, I prefer to consider the entire solution suite - GigaStor, along with GigaFlow and Apex - for comprehensive network visibility and monitoring. So, I prefer to integrate all three solutions to provide the best visibility. They complement each other well, with Apex aggregating and correlating data from both GigaStor and GigaFlow to enhance environmental understanding and troubleshooting efficiency.

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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 most valuable feature is the performance parameters of the system."

"Nagios doesn't get the respect it deserves; most likely due to the fact that it doesn't have a licensing cost."

"The application performance monitoring feature is valuable."

"The solution is quite efficient."

"The solution is very complete and mostly easy to manage."

"Nagios Core integrates with tools like Splunk, Datadog, or Dynatrace. It is usually used as a feed to provide more technical information about devices or hosts to another system."

"This is probably the greatest advantage of Nagios - it can be customized to a degree to suit your monitoring needs."

"We use the product to monitor server applications."

More Nagios Core pros

"This solution allows us to see exactly what is going on in the network and we can very quickly solve issues with users."

"It can help to write your rules, organize firewalls, your block, and also your protocols and IP address to come in or out of your network."

"There are many valuable features, but understanding end-user response times stands out. It provides a score-based evaluation of user experience, helping customers quickly pinpoint whether issues originate from the network, server, client, or application. Additionally, it facilitates in-depth analysis of application dependencies."

"Industry-leading line rates, packet-capture technology and data-mining capabilities are the most valuable features."

"If you have the opportunity, I would strongly encourage you to get it, because it makes the IT experience easier and more flexible, by providing the ability to see things in your networks like the directory packet label."

"I have no regrets using this product, I am very satisfied for what I paid for it and for the things I am able to do with the product."

"The ability to capture packets. It is not only for monitoring. That is very important for a company that wants to keep an eye on the packets, the transactions, the flows..."

"I also have the ability to see an application's performance, to see what's going on, why a network is slow, why this program for this user is experiencing a delay or some network issue"

More Observer GigaStor pros

Cons

"I would like to see more training videos."

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

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

"The configuration and reporting modules need to be improved."

"Lessening the price point would be an improvement."

"It would be nice if the company offered a sales or contract manager that was dedicated to our company so that we would have some sort of link to Nagios, and if we had issues or questions, we'd be able to contact them directly."

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

"Setup is bit complicated due to the large set of libraries it needs, but this may be because it's open source."

More Nagios Core cons

"As of this moment, the graphics might need some improvement, because a lot of the information there must be input first to have full potential."

"Maybe the graphical user interface could be simplified to allow people to use it more easily. It's already good, but they can work more on it to make it even easier."

"The interface is pretty complex, so for the average user, it takes a while to get up to speed with it. I would like it to be more user-friendly."

"There are some issues, in our environment that puts processing restraints on the Gigastor when turning on trending data to be sent to APEX."

"Maybe the graphical user interface could be simplified to allow people to use it more easily."

"GigaStor feeds into Apex. So, the area where there could be improvement would be in artificial intelligence. For example, the incorporation of more advanced machine learning or AI capabilities could enhance its functionality."

"I would like to have more than 4TB of storage available in the portable version of this solution."

"The Observer Console UI is consistent and stable, but could use some updating to be more modern."

More Observer GigaStor cons

Pricing and Cost Advice

"The enterprise version has technical support. The version we are using is free."

"Lessening the price point would be an improvement."

"Nagios Core is free to use."

"Most the plugin features are free."

"It's free."

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

"The Nagios Core (PNP4Nagios + Core) is free and can be setup by Netadmin within a few hours. The only additional cost is the cloud server."

"We are using the free version."

More Nagios Core pricing and cost advice

"It's quite expensive."

"It depends on the requirements you have. There are three types of license. There's the updates license, the work group license, and the workstation license."

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Top Industries

By visitors reading reviews

Manufacturing Company

10%

Comms Service Provider

10%

Computer Software Company

Government

Construction Company

17%

Financial Services Firm

15%

Wholesaler/Distributor

Computer Software Company

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	20
Midsize Enterprise	11
Large Enterprise	23

By reviewers
Company Size	Count
Small Business	5
Large Enterprise	3

Questions from the Community

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.

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What is your primary use case for Nagios Core?

I was a senior system administrator. I've been using Nagios Core for more than ten years now. It can be used to monitor hosts, such as machines, and monitor services of any kind. I'm using it to mo...

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What do you like most about Observer GigaStor?

See all answers

What is your experience regarding pricing and costs for Observer GigaStor?

I would rate the pricing a ten out of ten. It's quite expensive.

See all answers

What needs improvement with Observer GigaStor?

GigaStor feeds into Apex. So, the area where there could be improvement would be in artificial intelligence. For example, the incorporation of more advanced machine learning or AI capabilities coul...

See all answers

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Compared 8% of the time

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Product Reports

Buyer's Guide

Nagios Core

March 2026

Download Nagios Core product report

Buyer's Guide

Observer GigaStor

March 2026

Download Observer GigaStor product report

Overview

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

Nagios

Observer GigaStor is a network analysis tool that comes in a variety of form factors, including rack mount, portable, and virtual. Capable of storing up to a petabyte of traffic for later analysis, GigaStor helps ensure optimal network and application performance.

Viavi Solutions

Sample Customers

Airbnb, Cisco, PayPal, FanDuel

Cisco Systems, Hawaiian Telecom, Renown Health, State of Nevada, U.S. Department of Veteran Affairs, Allstate Insurance, Jack Henry & Associates, United States Airforce, US Bank, Blue Cross Blue Shield of Minnesota, Texas Tech University Health Sciences Center, Chicago Board Options Exchange

Buyer's Guide

Nagios Core vs. Observer GigaStor

March 2026

Free Report: Nagios Core vs. Observer GigaStor

Find out what your peers are saying about Nagios Core vs. Observer GigaStor and other solutions. Updated: March 2026.

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