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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
392
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

"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."
"Splunk has reduced application downtime by helping identify the point of failure."
"I am enjoying our implementation of risk-based alerting. That has helped very much with cutting out a lot of the noise that we have. It has reduced our alert volume significantly. There is about an 80% reduction."
"Splunk Enterprise Security is able to process a huge amount of data without any issues."
"My security ops team takes around 30 minutes to one hour to remediate security incidents with Splunk Enterprise Security compared to a previous solution."
"I would assess the stability and reliability of Splunk Enterprise Security as very reliable and very stable."
"Generally speaking, their support is pretty good and their response time is pretty good."
"Incident detection is the positive impact I have seen from Splunk Enterprise Security; it probably saved the company from financial losses because of the early detection of the incidents."
"The most valuable features are how stable and easy to use Splunk is."
 

Cons

"The product is not easy to learn."
"Security Onion's user interface could be improved."
"The initial setup of the solution is a little bit difficult."
"Delays in responses from the technical team can pose challenges for both vendors and clients, especially considering that Splunk applications and machine solutions are critical assets."
"Cybersecurity and infrastructure monitoring have room for improvement."
"From the commercial point of view, they have to bring down their costs."
"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."
"The product's price may be an area of concern where improvements are required."
"More training on PetaData using artificial intelligence techniques to identify the events which are not normal and exceptions would help the organization identify threats and malware on the go with results."
"While there aren't any major areas where the solution has to be improved, there are certain integrations that are still not available. I would specifically like to see legacy applications integrated."
"The Enterprise Security app could be improved. We have had trouble with it working from the first day."
 

Pricing and Cost Advice

"Security Onion is an open-source solution."
"It is an open-source solution."
"Security Onion is a free solution."
"Splunk Enterprise Security's pricing is based on data volume, which generally suits large enterprises."
"Splunk Enterprise Security is priced lower than competitors."
"Be upfront about your needs and expectations. Splunk is great to work with."
"Splunk is priced higher than other solutions."
"It is pretty straightforward and based on the sizing. If I compare it with other competitors, it makes sense."
"Regarding the product's pricing, I think it has always been difficult to have a conversation with Splunk."
"Pricing and licensing is quite expensive. But for the value the product provides, it seems at par in the market."
"I think we recently switched to the SVC pricing compared to the ingest pricing."
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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
8%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business123
Midsize Enterprise52
Large Enterprise272
 

Questions from the Community

Ask a question
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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.
896,387 professionals have used our research since 2012.