NETSCOUT vSTREAM vs Nagios Core comparison

Nagios and NETSCOUT are both solutions in the Network Monitoring Software category. Nagios is ranked #10 with an average rating of 8.7, while NETSCOUT is ranked #83. Nagios holds a 1.9% mindshare in NMS, compared to NETSCOUT’s 0.4% mindshare. Additionally, 80% of Nagios users are willing to recommend the solution, compared to 100% of NETSCOUT users who would recommend it.

Nagios Core

Read 51 Nagios Core reviews

5,494 Views
4,505 Comparison Views

80% willing to recommend

NETSCOUT vSTREAM

Read 3 NETSCOUT vSTREAM reviews

860 Views
826 Comparison Views

100% willing to recommend

Nagios Core

NETSCOUT vSTREAM

Comparison Buyer's Guide

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Executive SummaryUpdated on Oct 10, 2024

Nagios Core and NETSCOUT vSTREAM compete in the network monitoring and management category. NETSCOUT vSTREAM appears to have an advantage due to its advanced features that may justify its higher cost.

Features: Nagios Core offers customizable plugin options, extensive alerting capabilities, and an open-source platform for community-driven development. NETSCOUT vSTREAM provides sophisticated data analytics, deep packet inspection, and detailed traffic visibility.

Room for Improvement: Nagios Core could improve by offering professional support, simplifying setup, and enhancing its graphical user interface. NETSCOUT vSTREAM may benefit from more cost-effective solutions, increased flexibility in plugin integrations, and better community engagement.

Ease of Deployment and Customer Service: Nagios Core's deployment benefits from extensive community resources, suitable for those familiar with open-source environments, with community-based support. NETSCOUT vSTREAM provides professional assistance and a structured deployment model, supported by expert customer service catering to enterprise environments.

Pricing and ROI: Nagios Core is cost-effective due to its open-source nature, ensuring a faster ROI for those willing to manage configurations and rely on community support. NETSCOUT vSTREAM, requiring a higher initial investment, offers strong ROI through thorough analytics and network performance insights, ideal for enterprises needing robust solutions.

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

Buyer's Guide

NETSCOUT vSTREAM vs. Nagios Core

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)

NETSCOUT vSTREAM

Ranking in Network Monitoring Software

83rd

Average Rating

8.0

Number of Reviews

Ranking in other categories

No ranking in other categories

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 NETSCOUT vSTREAM is 0.4%, up from 0.3% 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%
NETSCOUT vSTREAM	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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Keval Lodaya

Network Engineer at Inniti Network Solution

A user-friendly solution that is easy to install and improves visibility

I would like to see improvements made to the user guide. From my personal experience, it is helpful to see a list of steps describing what to do next in different situations. An example is what to do and what to back up in the case of certain types of failure. There are also cases where a customer can't understand specific features. Enhancements to the user guide would be helpful for this. More features for network fragmentation would be helpful.

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 application performance monitoring feature is valuable."

"Open source and very flexible, with a large ecosystem of tools and custom monitors built up around Nagios."

"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."

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

"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."

"The good thing about Nagios Core is it covers everything."

"I would rate the overall solution ten points out of ten."

"Dashboard provides monitor of total assets."

More Nagios Core pros

"vSTREAM gives us better visibility and reporting about our network infrastructure, allowing for cost-optimization."

"One of the valuable features is the packet decoding."

Cons

"The alerting mechanism in Nagios Core could be improved."

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

"It would be nice if it was hosted in cloud. Also, they need to improve the graphs."

"The dashboard should be improved."

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

"Would benefit from aggregations if a particular server goes down."

"Nagios' great customizability is also one of its greatest drawback."

"Generally, it does what I need it to do, but better error reporting would be great."

More Nagios Core cons

"I would like to see improvements made to the user guide."

"I would like for it to have a smaller footprint of the virtual appliance and better performance."

"Room for improvement exists in filtering in the packet decode."

Pricing and Cost Advice

"Nagios Core is an open source solution, and there are no licensing fees."

"We are using the free version."

"The solution is expensive."

"It's free."

"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."

"Lessening the price point would be an improvement."

"Most the plugin features are free."

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

More Nagios Core pricing and cost advice

"Licensing is quite expensive."

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Top Industries

By visitors reading reviews

Manufacturing Company

10%

Computer Software Company

10%

Comms Service Provider

Government

Energy/Utilities Company

16%

Financial Services Firm

14%

Computer Software Company

Retailer

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

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

No data available

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.

See all answers

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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Comparisons

LibreNMS vs Nagios Core

Compared 7% of the time

Icinga vs Nagios Core

Compared 6% of the time

Zabbix vs Nagios Core

Compared 5% of the time

Nagios XI vs Nagios Core

Compared 5% of the time

Centreon vs Nagios Core

Compared 5% of the time

More Nagios Core Competitors

NETSCOUT InfiniStreamNG vs NETSCOUT vSTREAM

Compared 22% of the time

Arista Data ANalyZer vs NETSCOUT vSTREAM

Compared 19% of the time

NETSCOUT nGeniusONE vs NETSCOUT vSTREAM

Compared 16% of the time

vRealize Network Insight vs NETSCOUT vSTREAM

Compared 14% of the time

NetMon vs NETSCOUT vSTREAM

Compared 13% of the time

More NETSCOUT vSTREAM Competitors

Product Reports

Buyer's Guide

Nagios Core

March 2026

Download Nagios Core product report

Buyer's Guide

Network Monitoring Software

March 2026

Download NETSCOUT vSTREAM product report

Also Known As

No data available

vSTREAM

Overview

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

Nagios

The vSTREAM virtual appliance complements existing Adaptive Session Intelligence (ASI)-based instrumentation to provide the same level of visibility within virtualized and cloud infrastructures that is already possible in physical environments. The vSTREAM virtual appliance is ideal for monitoring service-critical traffic running within virtualized or cloud infrastructures, either locally on a host or as an aggregation point for multiple hosts. With complete visibility across physical, virtual and cloud networks, the vSTREAM virtual appliance presents real-time views of end-to-end call trace data and network-wide KPIs, to protect the reliability and availability of networks and application services.

NETSCOUT

Sample Customers

Airbnb, Cisco, PayPal, FanDuel

Metropolitan Police Agency, Banpara, PropertyRoom.com

Buyer's Guide

NETSCOUT vSTREAM vs. Nagios Core

March 2026

Free Report: NETSCOUT vSTREAM vs. Nagios Core

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