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Security Onion vs Splunk Enterprise Security comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jul 13, 2025

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
19th
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
2nd
Average Rating
8.4
Reviews Sentiment
7.4
Number of Reviews
365
Ranking in other categories
Security Information and Event Management (SIEM) (1st), IT Operations Analytics (1st)
 

Mindshare comparison

As of September 2025, in the Log Management category, the mindshare of Security Onion is 4.6%, down from 5.2% compared to the previous year. The mindshare of Splunk Enterprise Security is 7.6%, down from 9.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Log Management Market Share Distribution
ProductMarket Share (%)
Splunk Enterprise Security7.6%
Security Onion4.6%
Other87.8%
Log Management
 

Featured Reviews

Jörg Kippe - PeerSpot reviewer
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.
Kyle Vernham - PeerSpot reviewer
Built-in searches and unified data access streamline alert investigation and boosts analyst efficiency
The two features I appreciate the most in Splunk Enterprise Security are the built-in searches, which have been very easy for us to get started with right out of the box, and the fact that it accesses all of our other systems. You can access it as a pane of glass rather than having to search individually. We also have the option to compare our analysts from our service to service. Splunk Enterprise Security helps our SOC team prioritize and investigate high-fidelity alerts more effectively by providing a more in-depth look and the ability to access a lot more of our data. Instead of jumping from several segmented systems, it allows us to have everything brought together in one place. For example, you have to move from our purview to our build system and to Splunk Enterprise Security, and it enables us to streamline that process. The built-in features of Splunk Enterprise Security, which we recently procured, have given us a good starting point and demonstrated the value of the product, providing an easy way to sell it to our company. The ease of getting everything into our purview helps us, and it serves as a good start for the investigation part in one location rather than what we usually have, which is jumping from system to system to system. Splunk Enterprise Security plays a role in our company's strategy to combat insider threats and advanced persistent threats by currently being in its technical test phase. We are still rolling it out, and it should help us find any insider threats based on information that our policy states should not be present in our system. Splunk Enterprise Security's risk-based alerting (RBA) has impacted our alert volume and analyst productivity because we've got many different systems feeding into it. However, it has helped to make it easier for our analysts to go through a set of events rather than 100 alerts. RBA allows us to streamline the process and customize it for our analysts. When it comes to leveraging Splunk Enterprise Security's dashboards and visualizations to communicate security posture to executives, it's pretty straightforward for any type of information. The visualization is easy to understand, but I haven't had any direct conversations with our executives.

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 the most mature solution in the market."
"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."
"Correlation search, in general, is valuable because it allows us to search multiple data sources easily."
"The features of Splunk Enterprise Security that I appreciate the most include the SPL search."
"The solution's most valuable feature is the dashboard, which allows us to see everything on the same page and provides easy visibility into problems."
"Splunk provides immediate visibility into key business metrics and new business insights that deliver immediate value."
"Splunk Enterprise Security is probably one of the first products that actually could handle all the ingest and do all the correlation without crumbling under its own weight."
"The product is good, it satisfies our customers."
"The solution is the market leader."
"Splunk is stable, and this is why many customers want it."
 

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."
"I would say we haven't seen any return on investment with Splunk Enterprise Security because we are still maturing and trying to get everything situated, and we're experiencing roadblocks with other teams not wanting to give us what we need."
"It needs to improve the way to install third-party apps and enable installation without logging into splunk.com."
"The documentation and training resources available for knowledge and training can be expanded. We need to learn more about Splunk Enterprise Security and new security attacks."
"The most significant challenges I face when using Splunk Enterprise Security for advanced threat detection include not having enough time to be in it, the resources and people to also be in there, and trying to configure it and teach people how to use it. A lack of resources prevents us from giving it the attention it needs."
"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."
"Splunk could enhance its services by providing more comprehensive professional assistance aimed at optimizing our investment."
"Our organization has very limited resources, so we would want to expand some of those automation and AI capabilities to fill those gaps."
"The implementation and the scanning of the logs can be difficult."
 

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 is affordable."
"The tool's pricing model is great. You can choose between workloads or volume."
"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."
"It can be cost-prohibitive when you start to scale and have terabytes of data. Its cost model is based on how much data it processes a day. If they're able to create scaled-down niche or custom package offerings, it may help with the cost. Instead of the full-blown features, if they can narrow the scope where it can only be used for a specific purpose, it would kind of create that market for the product, and it may help with the costing. When you start using it as a central aggregator and you're pumping tons of logs at it, pretty soon, you'll start hitting your cap on what it can process a day. Once you've got that, you're kind of defeating the purpose because you're going to have to scale back."
"I think that most of the log analytics solutions are expensive and I'm not sure if it's worth it."
"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 is costly but it’s worth it due to the high-end features."
"The licensing is good, but the pricing absolutely needs some work. It is very high."
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Comparison Review

VS
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
11%
Computer Software Company
11%
Comms Service Provider
11%
Government
10%
Computer Software Company
14%
Financial Services Firm
14%
Manufacturing Company
8%
Government
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business110
Midsize Enterprise48
Large Enterprise255
 

Questions from the Community

What do you like most about Security Onion?
The most valuable feature of Security Onion for security monitoring is its ability to find infected ports.
What is your experience regarding pricing and costs for Security Onion?
Security Onion is an open-source solution. On a scale from one to ten, where ten is expensive and one is cheap, I rate the solution's pricing a six out of ten.
What needs improvement with Security Onion?
The initial setup of the solution is a little bit difficult.
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: September 2025.
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