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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
399
Ranking in other categories
Security Information and Event Management (SIEM) (1st), IT Operations Analytics (1st)
 

Mindshare comparison

As of June 2026, in the Log Management category, the mindshare of Security Onion is 2.0%, down from 5.3% 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 Onion2.0%
Other91.2%
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."
"The alerts are very effective."
"Most of our return on investments have been through faster error resolutions."
"My overall experience with Splunk Enterprise Security in the energy sector has been overwhelmingly positive."
"The metrics and trends that Splunk Enterprise Security generates using all the data points we send allow customers to understand better what their users are doing."
"Out-of-the-box, it seems very powerful."
"Splunk RBA or risk-based alerting definitely made our lives a lot easier; we went from hundreds of alerts having to be triaged a day, that generally could be false positives or just noise, and bubble them into one overall alert that we can look at on a per-day basis and see what's rising to the top and respond faster, have a higher rate of true positives and find evil a lot quicker."
"Splunk Enterprise Security helped us with faster detection of threats."
"It is very scalable."
 

Cons

"Security Onion's user interface could be improved."
"The product is not easy to learn."
"The initial setup of the solution is a little bit difficult."
"It needs integration with a configuration management solution."
"A problem that we had recently had was we licensed it based on how much data you upload to them every day."
"It's difficult to set up initially, and their billing model is also a bit complicated."
"You can run a script from an event, but it needs many clicks to run that integration, which could be made easier."
"While Splunk Enterprise Security offers valuable features, its cost is high and could be more competitive."
"It requires a significant amount of relatively complex architecture once you push past the single server instance."
"For us, the area that Splunk Enterprise Security can improve is performance optimization."
"The support and the pricing can be better"
 

Pricing and Cost Advice

"Security Onion is an open-source solution."
"Security Onion is a free solution."
"It is an open-source solution."
"The variables and the flexibility that Splunk provides are helpful, especially in a hybrid and multi-cloud environment."
"Splunk has always been on the expensive side."
"Splunk can be expensive, as its licensing is based on the daily data ingestion volume."
"Splunk licensing model might seem expensive but with all the gain in functionalities you will have compared to traditional SIEM solutions I think it’s worth the price."
"The pricing of Splunk Enterprise Security is high."
"In addition to the licensing fee, there is also a support and maintenance charge."
"Splunk Enterprise Security's pricing is pretty competitive."
"Splunk is not free."
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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%
Construction Company
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business126
Midsize Enterprise56
Large Enterprise277
 

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: June 2026.
899,917 professionals have used our research since 2012.