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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

"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."
"Technical support is excellent! It is of top notch level."
"From the class that I took this week, being able to create notable events from whatever you find in the data set is pretty useful."
"The ability to identify risks as they come in is quite good."
"Splunk gives my clients the ability to bring multiple, disparate types of data together, then correlate and report on them."
"The breadth of the data sources that Splunk can ingest data from is broad and deep and it does an exemplary job at handling structured data."
"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."
"You can run reports against multiple devices at the same time. You are able to troubleshoot a single application on a thousand servers. You can do this with a single query, since it is very easy to do."
"Regarding scalability, Splunk Enterprise Security is way ahead compared to other products, and I would score it at the maximum."
 

Cons

"The product is not easy to learn."
"The initial setup of the solution is a little bit difficult."
"Security Onion's user interface could be improved."
"Because the licensing model is very complicated to understand, it would be better to start with another product that provides a better licensing model."
"There are new services which are coming up. If Splunk can catch up with the speed of Amazon, and with the integration, instead of us waiting for another year or so, that would be good."
"Being a SIEM solution with a centralized dashboard, we would like to have more options to customize it."
"While Splunkbase (the app repository) has a lot of great content, some apps are terribly old and could stand to be updated or purged."
"I think the licensing costs for Splunk Enterprise Security are on the higher side, but I am not certain."
"I encounter issues such as downtime, bugs, glitches, and unbox errors."
"Licensing costs can be a barrier for those with limited budgets."
"Splunk has different plugins but by default, the logs are not organized, it shows that there are roll-ups that are out of the box."
 

Pricing and Cost Advice

"Security Onion is a free solution."
"It is an open-source solution."
"Security Onion is an open-source solution."
"The pricing model is expensive and a nightmare based on the amount of data."
"The pricing is based on the volume of data fed into it, which can lead to substantial costs. This pricing model is complex and unpredictable, making cost management difficult."
"Splunk should be able to integrate with other product using the free version."
"Setup cost is cheap: It is free, it is user-friendly, and it is fast."
"Its pricing model can be improved."
"It is expensive. I used to buy it early on, but then they combined it into a higher-up organization. They buy it for multiple systems now. Last time, I paid around 60K for it. There is just the licensing fee. That's all."
"Our customers often complain that the price of Splunk is too high."
"Splunk is a bit pricier, but the benefits and ROI are huge."
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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
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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.
893,221 professionals have used our research since 2012.