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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
8.6
Reviews Sentiment
6.9
Number of Reviews
25
Ranking in other categories
Operating Systems (OS) for Business (10th)
Security Onion
Average Rating
7.6
Reviews Sentiment
5.5
Number of Reviews
3
Ranking in other categories
Log Management (29th)
 

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 4.1%, up 2.2% compared to last year.
Security Onion, on the other hand, focuses on Log Management, holds 2.3% mindshare, down 5.5% since last year.
Operating Systems (OS) for Business Mindshare Distribution
ProductMindshare (%)
Kali Linux4.1%
Rocky Linux8.2%
Ubuntu Linux8.0%
Other79.7%
Operating Systems (OS) for Business
Log Management Mindshare Distribution
ProductMindshare (%)
Security Onion2.3%
Splunk Enterprise Security6.8%
Wazuh5.4%
Other85.5%
Log Management
 

Featured Reviews

Ciyagi Ciyagi - PeerSpot reviewer
Senior Solution Architect & Delivery Lead at a tech services company with 10,001+ employees
Runs efficiently across devices and streamlines penetration testing workflows
Kali Linux could be improved by including more tools. I would personally like to see improvements in Kali Linux, particularly regarding Grub issues that sometimes occur when installing the VM. Additionally, I have experienced problems when updating Kali Linux from a higher version to a lower version, which resulted in crashes. These Grub issues should be resolved. I face significant challenges with Kali Linux regarding a major issue with the Grub loader becoming corrupted, which makes it very difficult to recover data.
Jörg Kippe - PeerSpot reviewer
Scientist at a educational organization with 10,001+ employees
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

"Kali Linux offers excellent features including being lightweight with low memory usage, easy installation, portability, and multiple architectures such as ARM architecture and server architecture."
"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."
"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."
"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 has the capability of real-time data scanning for vulnerability assessment for backend services, and that is actually very far more valuable."
"Kali Linux has impacted my organization positively because it has allowed for the better security of my applications."
"The solution's stability is very good."
"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 valuable feature of Security Onion for security monitoring is its ability to find infected ports."
"Security Onion is the most mature solution in the market."
"We use Security Onion for internal vulnerability assessment."
 

Cons

"From an improvement perspective, it should be made possible for users to learn about the product easily."
"The only point that I didn't find on Kali Linux for now is the ability to customize port scanning."
"The product should integrate AI and GPT capabilities."
"The tool is already stable and well-developed, so there's minimal feedback for enhancement or change. However, it should improve security, which is crucial, especially with the increasing use of Kali Linux in cloud environments."
"I face significant challenges with Kali Linux regarding a major issue with the Grub loader becoming corrupted, which makes it very difficult to recover data."
"I think Kali Linux can be improved because it is not a beginner-friendly operating system."
"However, something about it might be improved, maybe the overall smoothness of it, because there are sometimes when I try to run a lot of applications, it tries to hang up on me."
"Kali Linux can be improved if its GUI were more user-friendly."
"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 price is good because Kali Linux already provides a good bundle of tools."
"It is an open-source tool."
"Kali Linux is open source."
"I have used the free version."
"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."
"Kali Linux is a free product, and you don't have to pay for a license."
"The licensing fee is expensive compared to other products."
"There is no need to make any payments towards the licensing costs since it is a solution that is available for free."
"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
University
12%
Construction Company
12%
Comms Service Provider
11%
Computer Software Company
9%
University
12%
Government
10%
Comms Service Provider
10%
Computer Software Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business10
Midsize Enterprise2
Large Enterprise17
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?
My experience with pricing, setup cost, and licensing for Kali Linux has been that it was free to use.
What needs improvement with Kali Linux?
I think Kali Linux is good, but there is a widespread misunderstanding related to Kali Linux because many people believe Kali Linux is a tool for hackers and that anything can be hacked using it. T...
Ask a question
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Comparisons

 

Overview

Find out what your peers are saying about Kali Linux vs. Security Onion and other solutions. Updated: June 2025.
893,221 professionals have used our research since 2012.