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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 is a very good tool and a good overall operating system to use when it comes to penetration testing, as it has a wonderful set of tools."
"Additionally, it now includes comprehensive migration analytics and reporting capabilities."
"The tools available in Kali Linux are incredibly effective for conducting security assessments."
"Kali Linux stands out compared to other operating systems I have used for security work because it is a specific distribution of Linux that has all the required tools pre-loaded and configured."
"Kali Linux has helped me significantly in simulating penetration testing and other activities, and since all the tools are open source, I can easily modify and customize them based on my needs."
"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."
"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."
"Security Onion is the most mature solution in the market."
"We use Security Onion for internal vulnerability assessment."
"The most valuable feature of Security Onion for security monitoring is its ability to find infected ports."
 

Cons

"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."
"From an improvement perspective, it should be made possible for users to learn about the product easily."
"While Kali Linux has gotten better over the past years, it could be improved if it was bundled in a CLI-only pack."
"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."
"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."
"Kali Linux can be improved if its GUI were more user-friendly."
"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."
"There are areas for improvement in Kali Linux, particularly regarding its use of the Linux kernel, which requires external additional patching, and the fact that network services are disabled by default, which complicates usage; enhancing user-friendliness through more GUI-based tools and better integration could be beneficial."
"Security Onion's user interface could be improved."
"The product is not easy to learn."
"The initial setup of the solution is a little bit difficult."
 

Pricing and Cost Advice

"The price is good because Kali Linux already provides a good bundle of tools."
"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."
"There is no need to make any payments towards the licensing costs since it is a solution that is available for free."
"The tool is open-source."
"I use it free of charge."
"It is an open-source tool."
"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.