No more typing reviews! Try our Samantha, our new voice AI agent.

Security Onion vs Splunk Enterprise Security comparison

Why PeerSpot?
 

Comparison Buyer's Guide

Executive SummaryUpdated on Jan 25, 2026

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

Security Onion
Ranking in Log Management
22nd
Average Rating
7.8
Reviews Sentiment
7.2
Number of Reviews
4
Ranking in other categories
No ranking in other categories
Splunk Enterprise Security
Ranking in Log Management
1st
Average Rating
8.4
Reviews Sentiment
7.2
Number of Reviews
418
Ranking in other categories
Security Information and Event Management (SIEM) (1st), IT Operations Analytics (1st)
 

Mindshare comparison

As of September 2026, in the Log Management category, the mindshare of Security Onion is 1.7%, down from 4.6% compared to the previous year. The mindshare of Splunk Enterprise Security is 6.8%, down from 7.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Log Management Mindshare Distribution
ProductMindshare (%)
Splunk Enterprise Security6.8%
Security Onion1.7%
Other91.5%
Log Management
 

Featured Reviews

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.
Sathis-Kumar - PeerSpot reviewer
Senior Manager at Bank of America
Helps us detect cyber threats quickly and integrate multiple feeds effectively
Overall, the product is good, but when it comes to some infrastructure issues, we have to dig into more logs. There is no straightforward indication of an issue. Health check kind of dashboards are not available. More AI would help us, and more optimization, since security products run more queries. The AI module could suggest solutions, optimizing queries or workload balancing. If the product itself advises on running queries during peak times, it would be similar to what ChatGPT currently offers. We see quite a few issues on stability. Even last week, we faced something, and identifying bottlenecks is not easy. We need more SMEs, and there is no mechanism to tell us about indexer or search head issues. Self-monitoring dashboards could be beneficial. The technical support still requires more improvement. Often, primary support takes a lot of time and forwards most solutions to the engineering side. The primary support team has very limited knowledge to provide.

Quotes from Members

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

Pros

"Security Onion is a completely open-source and free platform, making it a cost-effective solution that works smoothly and effectively for our organization."
"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 the most mature solution in the market."
"Splunk is extremely flexible, which allows us to create custom visualizations along with other customizations."
"Splunk has improved our operations by giving us access to more information and allowing us to deploy more use cases."
"Splunk Enterprise Security's dashboards are a key asset."
"The performance is very good; it's something that customers are always looking for, and the product offers good stability with no bugs or glitches, and it doesn't crash or freeze, making it reliable."
"The AI-driven detections have improved the accuracy of my investigations significantly, reduced my mean time to detection by about 30 percent and my mean time to resolution by about 40 percent, and contributed to faster, more efficient threat detection compared to other SIEM tools I have used."
"The best features I've experienced over the past six years with Splunk Enterprise Security are the ability to create use cases and the flexibility to customize searches and use cases based on our specific requirements."
"Some of the insights that we have obtained as a part of using Splunk have greatly helped us in increasing our revenue in terms of selling our products."
"Splunk gives my clients the ability to bring multiple, disparate types of data together, then correlate and report on them."
 

Cons

"The initial setup of the solution is a little bit difficult."
"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."
"Security Onion's user interface could be improved."
"The product is not easy to learn."
"Its deployment is difficult. I remember when I first started learning, I faced several challenges, especially when deploying VMware in a virtual environment."
"It would be good if the solution had some kind of copilot to automate or help write correlation searches."
"We don't have SOAR products from Splunk. I believe that's an important piece."
"The way Splunk Enterprise Security could improve is by pulling in and mapping my DHCP data and tracking users' IP addresses as it changes throughout sessions, and being able to keep track of who is actually assigned to what IP address more natively."
"I have concerns about the architecture as well since I can see it is not very well defined."
"Splunk Enterprise Security could be cheaper."
"The solution could be more user friendly and it's difficult to know at this stage whether our requirements will be met by the solution."
"Search head clustering is often temperamental in its current state and should be improved, replaced by something better, or be reverted to search head pooling."
 

Pricing and Cost Advice

"It is an open-source solution."
"Security Onion is a free solution."
"Security Onion is an open-source solution."
"It can be tough to determine if you are getting all of the value out of your investment at times."
"It's definitely worth it."
"My customers have found the price of the solution to be high."
"We have an unlimited one, and we pay yearly, but I don't know how much it costs. Previously, I worked for a startup, and when they started building it up, it was complicated for them because they didn't have the budget for that many licenses. It was very costly for them. So, startups might find it a little bit problematic because of the licensing, but for bigger companies, there is no issue."
"Splunk Enterprise Security is a bit expensive overall, but it provides good value."
"The solution is a little expensive."
"I think we recently switched to the SVC pricing compared to the ingest pricing."
"It is expensive. I work for multiple clients. I am working for more than five clients, but most of the clients are switching from Splunk to Sentinel because of the cost. Even though Sentinel is very limited, clients are moving to Sentinel."
report
Use our free recommendation engine to learn which Log Management solutions are best for your needs.
911,769 professionals have used our research since 2012.
 

Comparison Review

VS
Manager, Enterprise Risk Consulting at a tech company with 1,001-5,000 employees
Feb 26, 2015
HP ArcSight vs. IBM QRadar vs. ​McAfee Nitro vs. Splunk vs. RSA Security vs. LogRhythm
We at Infosecnirvana.com have done several posts on SIEM. After the Dummies Guide on SIEM, we are following it up with a SIEM Product Comparison – 101 deck. So, here it is for your viewing pleasure. Let me know what you think by posting your comments below. The key products compared here are…
 

Top Industries

By visitors reading reviews
Comms Service Provider
12%
University
12%
Government
9%
Construction Company
7%
Financial Services Firm
12%
Outsourcing Company
10%
Manufacturing Company
8%
Construction Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business129
Midsize Enterprise65
Large Enterprise285
 

Questions from the Community

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...
What SOC product do you recommend?
For tools I’d recommend: -SIEM- LogRhythm -SOAR- Palo Alto XSOAR Doing commercial w/o both (or at least an XDR) is asking to miss details that are critical, and ending up a statistic. Also, rememb...
What is a better choice, Splunk or Azure Sentinel?
It would really depend on (1) which logs you need to ingest and (2) what are your use cases Splunk is easy for ingestion of anything, but the charge per GB/Day Indexed and it gets expensive as log ...
How does Splunk compare with Azure Monitor?
Splunk handles a high amount of data very well. We use Splunk to capture information and as an aggregator for monitoring information from different sources. Splunk is very good at alerting us if we...
 

Overview

 

Sample Customers

Information Not Available
Splunk has more than 7,000 customers spread across over 90 countries. These customers include Telenor, UniCredit, ideeli, McKenney's, Tesco, and SurveyMonkey.
Find out what your peers are saying about Security Onion vs. Splunk Enterprise Security and other solutions. Updated: August 2026.
911,769 professionals have used our research since 2012.