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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
7.2
Number of Reviews
17
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 3.0%, up 0.8% compared to last year.
Security Onion, on the other hand, focuses on Log Management, holds 4.5% mindshare, down 5.4% since last year.
Operating Systems (OS) for Business Market Share Distribution
ProductMarket Share (%)
Kali Linux3.0%
Rocky Linux14.3%
Ubuntu Linux11.5%
Other71.2%
Operating Systems (OS) for Business
Log Management Market Share Distribution
ProductMarket Share (%)
Security Onion4.5%
Wazuh12.2%
Grafana Loki7.9%
Other75.4%
Log Management
 

Featured Reviews

Aditya Pillai - PeerSpot reviewer
Has helped me learn penetration testing through hands-on tasks and faster workflows
It would be helpful if Kali Linux could be involved in more systems or laptops. Windows is a standard for many laptops and comes pre-installed on many devices available in the market. If Kali Linux could do the same and increase their reach to better areas, it would be beneficial. They could improve Kali Linux's UI/UX. They have been following a standard UI/UX. They could add more options, similar to how CachyOS distro of Arch Linux has many different UI options to select from. Making Kali Linux more customizable would allow users to personalize it to their style. Many users utilize Kali Linux through virtual machines. Sometimes Kali Linux has issues detecting hardware such as inbuilt or external Wi-Fi adapters. Improving device detection would be beneficial.
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

"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 interface is good and straightforward to use."
"The solution's most valuable feature is that it is very easy to use."
"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."
"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 outcomes from using Kali Linux in our organization are significant; we experienced reduced cybersecurity attacks and improved application security, leading to decreased attack surfaces and quicker testing cycles that enabled faster launches and installations."
"The tools available in Kali Linux are incredibly effective for conducting security assessments."
"We use the product for open-source intelligence and identifying vulnerabilities."
"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

"The installation process of Kali Linux can be slow, particularly when installing and upgrading packages within virtualized environments."
"Many users utilize Kali Linux through virtual machines. Sometimes Kali Linux has issues detecting hardware such as inbuilt or external Wi-Fi adapters."
"The tool is slightly difficult to learn."
"The product should improve its security features."
"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."
"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, 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 is not easy to learn."
"The initial setup of the solution is a little bit difficult."
"Security Onion's user interface could be improved."
 

Pricing and Cost Advice

"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."
"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."
"The licensing fee is expensive compared to other products."
"Kali Linux is open source."
"Security Onion is an open-source solution."
"Security Onion is a free solution."
"It is an open-source solution."
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Top Industries

By visitors reading reviews
Comms Service Provider
13%
Computer Software Company
12%
University
12%
Educational Organization
11%
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 Enterprise8
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 costs, and licensing for Kali Linux has been positive, as it operates under an open-source model with setup costs primarily related to hardware and virtual machine...
What needs improvement with Kali Linux?
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 de...
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.
872,655 professionals have used our research since 2012.