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Kali Linux vs Security Onion comparison

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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
6.8
Number of Reviews
26
Ranking in other categories
Operating Systems (OS) for Business (10th)
Security Onion
Average Rating
7.8
Reviews Sentiment
7.2
Number of Reviews
4
Ranking in other categories
Log Management (22nd)
 

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 4.2%, up 2.7% compared to last year.
Security Onion, on the other hand, focuses on Log Management, holds 1.7% mindshare, down 4.6% since last year.
Operating Systems (OS) for Business Mindshare Distribution
ProductMindshare (%)
Kali Linux4.2%
Ubuntu Linux8.1%
Windows 117.4%
Other80.3%
Operating Systems (OS) for Business
Log Management Mindshare Distribution
ProductMindshare (%)
Security Onion1.7%
Splunk Enterprise Security6.8%
IBM Security QRadar4.5%
Other87.0%
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.
Hiten Nandasana - PeerSpot reviewer
Angular developer at Flourish software
Centralized monitoring has strengthened threat detection and supports faster incident investigations
Security Onion is a completely open-source and free platform, making it a cost-effective solution that works smoothly and effectively for our organization. Security Onion integrates well with our existing tools, primarily using Linux systems in our organization, allowing us to monitor logs and manage threat detection and operations in the public cloud effectively. Security Onion is very helpful in meeting compliance requirements and supports regular standards for our environment. I advise organizations that use Linux or have network security knowledge to consider Security Onion, as it satisfies requirements such as threat detection and log management systems. I would rate this review eight out of ten.

Quotes from Members

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

Pros

"The tools available in Kali Linux are incredibly effective for conducting security assessments."
"Kali Linux is the only solution for cybersecurity if we are conducting pen testing or anything related to it."
"If you are looking for faster, better performance or scalability, then Kali Linux is the best."
"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."
"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."
"Kali Linux has impacted my organization positively because it has allowed for the better security of my applications."
"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."
"Kali Linux has the capability of real-time data scanning for vulnerability assessment for backend services, and that is actually very far more valuable."
"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."
"Security Onion is a completely open-source and free platform, making it a cost-effective solution that works smoothly and effectively for our organization."
"Security Onion is the most mature solution in the market."
 

Cons

"While Kali Linux has gotten better over the past years, it could be improved if it was bundled in a CLI-only pack."
"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."
"Increasing the tutorials and the help inside Kali Linux would make it more useful."
"Sometimes you need a graphical interface, it would be easier to start with if the AMI already have it installed and enabled it."
"The tool is slightly difficult to learn."
"Kali Linux can be improved, as I have encountered challenges with dependencies that can be overwhelming."
"Documentation is one of the major problems, and training is also lacking."
"Some tools in Kali Linux lack documentation and details on how to use them, which is one area where it can be improved."
"Security Onion's user interface could be improved."
"The product is not easy to learn."
"Security Onion can be made easier to set up initially, as it is somewhat difficult at the start, but once configured, it becomes a great tool to use."
"The initial setup of the solution is a little bit difficult."
 

Pricing and Cost Advice

"The tool is open-source."
"I have used the free version."
"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."
"I use it free of charge."
"The price is good because Kali Linux already provides a good bundle of tools."
"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."
"It is an open-source tool."
"It is an open-source solution."
"Security Onion is an open-source solution."
"Security Onion is a free solution."
report
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913,806 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Comms Service Provider
12%
Construction Company
11%
University
10%
Educational Organization
7%
Comms Service Provider
12%
University
12%
Government
10%
Construction Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business12
Midsize Enterprise2
Large Enterprise17
No data available
 

Questions from the Community

What is your experience regarding pricing and costs for Kali Linux?
It is open source. We do not need to pay anything. Most of the tools are open source, so we do not need to pay for licensing. There is minimum cost we have to pay, and based on our expertise, we ca...
What needs improvement with Kali Linux?
Kali Linux is an operating system plus tool, and it is a Linux-based product, so if we need to do anything for Windows, we do not have an option to use the same type of tool. If Kali could provide ...
What is your primary use case for Kali Linux?
I use Kali Linux for vulnerability testing, sandbox analysis, red team penetration testing, and checking vulnerabilities in the network, checking vulnerabilities with users, and red teaming proacti...
What is your experience regarding pricing and costs for Security Onion?
Security Onion does not require any cost, as it is open-source and free.
What needs improvement with Security Onion?
Security Onion can be made easier to set up initially, as it is somewhat difficult at the start, but once configured, it becomes a great tool to use. I assigned a rating of eight out of ten because...
What advice do you have for others considering Security Onion?
Security Onion is a completely open-source and free platform, making it a cost-effective solution that works smoothly and effectively for our organization. Security Onion integrates well with our e...
 

Comparisons

 

Overview

Find out what your peers are saying about Red Hat, Canonical, Rocky Linux and others in Operating Systems (OS) for Business. Updated: September 2026.
913,806 professionals have used our research since 2012.