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Kali Linux vs Security Onion comparison

 

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

Kali Linux
Average Rating
8.8
Reviews Sentiment
7.7
Number of Reviews
14
Ranking in other categories
Operating Systems (OS) for Business (11th)
Security Onion
Average Rating
7.6
Reviews Sentiment
5.5
Number of Reviews
3
Ranking in other categories
Log Management (19th)
 

Mindshare comparison

Kali Linux and Security Onion aren’t in the same category and serve different purposes. Kali Linux is designed for Operating Systems (OS) for Business and holds a mindshare of 2.7%, up 0.6% compared to last year.
Security Onion, on the other hand, focuses on Log Management, holds 4.6% mindshare, down 5.2% since last year.
Operating Systems (OS) for Business Market Share Distribution
ProductMarket Share (%)
Kali Linux2.7%
Rocky Linux14.9%
Ubuntu Linux11.9%
Other70.5%
Operating Systems (OS) for Business
Log Management Market Share Distribution
ProductMarket Share (%)
Security Onion4.6%
Wazuh12.6%
Grafana Loki8.1%
Other74.7%
Log Management
 

Featured Reviews

NilutpalDutta - PeerSpot reviewer
Provides valuable real-time data scanning for vulnerability assessment
We don't know if Kali Linux has the port scanning capability yet, but that is an area of improvement because we are working with DMZ zones and customized ports. If we can add featured customized port scanning and DMZ zone capability, then it will be a very great tool. It might be there, but we are not exploring it yet. We are not exploring 100% of Kali Linux capabilities. If real-time customized port scanning can be added, for example, instead of a default port such as 8080 or 443, if we can use a customized port such as 9876, that capability would be great. The only point that I didn't find on Kali Linux for now is the ability to customize port scanning.
Jörg Kippe - PeerSpot reviewer
A mature and affordable solution that is easy to install and easy to update
The product takes time to learn, it's not that easy. In the beginning we had a lot of questions. If you want to use such a tool in an real (industrial) environment, you have to ask how to get the network data. Can we do a full packet capture? Can we provide agents to our end systems? There are no simple solutions to these questions. It's a general problem when running such systems in an industrial environment.

Quotes from Members

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

Pros

"We use the product for open-source intelligence and identifying vulnerabilities."
"The interface is good and straightforward to use."
"I use the tool with Nmap to perform network audits. We use it to find vulnerabilities in our network through attacks. It's for those who want to launch or create viruses or perform attacks on systems. With Kali Linux, you can conduct penetration testing for networks, web applications, and Android mobile apps."
"The most effective features of Kali Linux include its stability as a Linux operating system, its flexibility in configuring resources such as partitions, its powerful and stable file system, and its multi-user capability, which allows for setting user privileges and rights. Additionally, Kali Linux provides access to a wide range of free and open-source applications for testing and development purposes."
"I'm mostly using for the web security web application, so end map and the troubleshoot will it's my price, and it's available in ColliNX."
"The most valuable feature of Kali Linux is the attack it performs using a CVE script that's already on the internet."
"In general, Kali Linux is used for hosting applications, developing new applications, and operating systems. It's also used in containers and nodes. The tool offers a smaller footprint than Windows because it lacks the functionality of graphical user interfaces. One advantage of Kali Linux is its lower maintenance requirements than Windows, with slower update cycles and easier maintenance procedures."
"Kali Linux is much better than other OS because it gives you a good set of tools. It is preferred for vulnerability assessments and cybersecurity."
"Security Onion is the most mature solution in the market."
"The most valuable feature of Security Onion for security monitoring is its ability to find infected ports."
"We use Security Onion for internal vulnerability assessment."
 

Cons

"I would like to have automation in Kali Linux instead of manually configuring or setting up something in case of an upgrade."
"The only point that I didn't find on Kali Linux for now is the ability to customize port scanning."
"The product should improve its security features."
"I would like for them to offer more features for the free version in order for users to test them in their internal environment before purchasing."
"The tool is slightly difficult to learn."
"Unfortunately, my current tool runs on Windows 10, and its use is restricted to enterprise versions. Integrating this tool or similar functionalities into Kali Linux for non-enterprise users would be incredibly valuable."
"From an improvement perspective, Kali Linux could include more ML to help with academic literature, as it is one of the areas where there are shortcomings in the solution."
"The installation process of Kali Linux can be slow, particularly when installing and upgrading packages within virtualized environments."
"Security Onion's user interface could be improved."
"The initial setup of the solution is a little bit difficult."
"The product is not easy to learn."
 

Pricing and Cost Advice

"The tool is open-source."
"Kali Linux offers a perpetual license, meaning you pay for it once and can use it. While free versions of Linux are available, Kali Linux, being an enterprise edition, usually comes with a perpetual license. I rate its pricing a five out of ten."
"I use it free of charge."
"Kali Linux is a free product, and you don't have to pay for a license."
"I have used the free version."
"It is an open-source tool."
"Kali Linux is open source."
"The licensing fee is expensive compared to other products."
"It is an open-source solution."
"Security Onion is a free solution."
"Security Onion is an open-source solution."
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Top Industries

By visitors reading reviews
Comms Service Provider
13%
Computer Software Company
13%
University
13%
Educational Organization
10%
University
11%
Computer Software Company
11%
Comms Service Provider
11%
Government
10%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business9
Midsize Enterprise1
Large Enterprise5
No data available
 

Questions from the Community

What do you like most about Kali Linux?
I use the tool with Nmap to perform network audits. We use it to find vulnerabilities in our network through attacks. It's for those who want to launch or create viruses or perform attacks on syste...
What is your experience regarding pricing and costs for Kali Linux?
Kali Linux offers a perpetual license, meaning you pay for it once and can use it. While free versions of Linux are available, Kali Linux, being an enterprise edition, usually comes with a perpetua...
What needs improvement with Kali Linux?
We don't know if Kali Linux has the port scanning capability yet, but that is an area of improvement because we are working with DMZ zones and customized ports. If we can add featured customized po...
What do you like most about Security Onion?
The most valuable feature of Security Onion for security monitoring is its ability to find infected ports.
What is your experience regarding pricing and costs for Security Onion?
Security Onion is an open-source solution. On a scale from one to ten, where ten is expensive and one is cheap, I rate the solution's pricing a six out of ten.
What needs improvement with Security Onion?
The initial setup of the solution is a little bit difficult.
 

Comparisons

 

Overview

Find out what your peers are saying about Kali Linux vs. Security Onion and other solutions. Updated: June 2025.
867,349 professionals have used our research since 2012.