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Security Onion vs Splunk Enterprise Security comparison

 

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
29th
Average Rating
7.6
Reviews Sentiment
5.5
Number of Reviews
3
Ranking in other categories
No ranking in other categories
Splunk Enterprise Security
Ranking in Log Management
1st
Average Rating
8.4
Reviews Sentiment
7.3
Number of Reviews
387
Ranking in other categories
Security Information and Event Management (SIEM) (1st), IT Operations Analytics (1st)
 

Mindshare comparison

As of May 2026, in the Log Management category, the mindshare of Security Onion is 2.3%, down from 5.5% compared to the previous year. The mindshare of Splunk Enterprise Security is 6.8%, down from 7.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Log Management Mindshare Distribution
ProductMindshare (%)
Splunk Enterprise Security6.8%
Security Onion2.3%
Other90.9%
Log Management
 

Featured Reviews

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.
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

"We use Security Onion for internal vulnerability assessment."
"Security Onion is the most mature solution in the market."
"The most valuable feature of Security Onion for security monitoring is its ability to find infected ports."
"It has been helping a lot of my clients with fast data mining and information propagation."
"The ability to digest any information and then correlate it in accordance with what you need is valuable. The ability to connect to pretty much everything and bring the information in the same format is also valuable. On top of that, we can use their language in order to create and customize the dashboards, correlations, or analytics that we want to incorporate."
"The SIEM is the most valuable feature of the product."
"From my experience, the visual aid that it provides is most valuable. There are charts and other means to provide information."
"Now with Splunk Enterprise Security, we have everything in one place—the notables are created automatically, but they can also create their own notables based on the investigation, which improved and reduced about 50% of the manual work that was done before versus what we are doing now."
"Splunk has facilitated the correlation of information security logs to look for incidents which could cause damage to the company's infrastructure, as well as financial losses from leaks."
"The correlation searches (properly configured) populate the Incident Management dashboard and provide me a quick birds-eye view of my most important concerns."
"The solution's most valuable feature is threat intelligence correlations."
 

Cons

"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."
"If it could be made available as a service, this would be much better than as a product."
"On the technical side, it would be nice to see aspects of the recent acquisition of Phantom make it into the core Splunk Enterprise, not just become a part of the premium Enterprise Security."
"Splunk does not provide any default threat intelligence like Microsoft Sentinel, but you can integrate any third-party threat intelligence with Splunk. By default, no threat intelligence suite is there, whereas, with IBM QRadar or Microsoft Sentinel, the default feature of threat intelligence is there. It is free. If Splunk can provide a default threat intelligence suite, it would be better."
"Enterprise security: Splunk must work on clarifying the solution to customers and explain how to gain more from it."
"I would like to see the asset and identity lookups be more automatic and less manual."
"Make it easy to use and the cost cheaper. This will help all organisations to implement Splunk."
"The configuration could be better."
"A few more analysis aids might help."
 

Pricing and Cost Advice

"Security Onion is a free solution."
"Security Onion is an open-source solution."
"It is an open-source solution."
"Splunk Enterprise Security is expensive."
"Splunk Enterprise Security is an expensive solution."
"The pricing model is based on the number of gigabytes that you ingest into the Splunk system. So it can be an expensive solution."
"This solution is costly. Splunk is obviously a great product, but you should only choose this product if you need all the features provided. Otherwise, if you don't need all the features to meet your requirements, there are probably other products that will be more cost-effective. It's cost versus the functionality requirement."
"The pricing modules could be improved."
"The solution is costly."
"Personnel costs are saved by not having to involve the domain developers from multiple teams when tracing a problem that spans multiple platforms."
"Splunk Enterprise Security is priced lower than competitors."
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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
University
12%
Government
10%
Comms Service Provider
10%
Computer Software Company
7%
Financial Services Firm
14%
Manufacturing Company
9%
Computer Software Company
9%
Comms Service Provider
5%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business118
Midsize Enterprise51
Large Enterprise269
 

Questions from the Community

Ask a question
Earn 20 points
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: April 2026.
893,221 professionals have used our research since 2012.