AlienVault OSSIM vs Splunk Enterprise Security comparison

AT&T and Splunk are both solutions in the Security Information and Event Management (SIEM) category. AT&T is ranked #13 with an average rating of 7.2, while Splunk is ranked #1 with an average rating of 8.3. AT&T holds a 1.7% mindshare in SIEM, compared to Splunk’s 7.1% mindshare. Additionally, 80% of AT&T users are willing to recommend the solution, compared to 94% of Splunk users who would recommend it.

AlienVault OSSIM

Read 31 AlienVault OSSIM reviews

4,374 Views
4,287 Comparison Views

80% willing to recommend

Splunk Enterprise Security

Read 376 Splunk Enterprise Security reviews

26,439 Views
13,748 Comparison Views

94% willing to recommend

AlienVault OSSIM

Splunk Enterprise Security

Comparison Buyer's Guide

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Executive SummaryUpdated on Jan 25, 2026

Splunk Enterprise Security and AlienVault OSSIM compete in the SIEM market. Splunk holds the upper hand due to its advanced analytics and scalability, which justify its higher cost for larger enterprises.

Features: Splunk Enterprise Security is known for its capabilities in data ingestion, log management, and rapid search. It also offers flexible integration with multiple data sources. It supports scalability and provides insights through advanced analytics. AlienVault OSSIM offers features such as threat intelligence integration and vulnerability assessment, and is appreciated for its cost-effectiveness.

Room for Improvement: Splunk could enhance its visualization and user interface, and address its high learning curve. Integrations can be complex. AlienVault OSSIM's interface is outdated and it lacks scalability compared to Splunk. Better threat intelligence integration would enhance its capabilities.

Ease of Deployment and Customer Service: Splunk offers flexible deployment options with strong customer support, although it can be complex and requires experienced personnel for optimal deployment. AlienVault OSSIM, primarily on-premises, is noted for ease of community edition deployment, but its technical support is less responsive compared to Splunk.

Pricing and ROI: Splunk has a higher price tag, making it suitable for enterprises with significant security needs, and offers good ROI through advanced features. AlienVault OSSIM, being open-source, provides cost advantages with limited features, appealing to smaller enterprises seeking basic SIEM capabilities. AlienVault's paid version enhances features at a reasonable cost, though opinions on ROI vary.

To learn more, read our detailed AlienVault OSSIM vs. Splunk Enterprise Security Report (Updated: February 2026).

Buyer's Guide

AlienVault OSSIM vs. Splunk Enterprise Security

February 2026

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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

AlienVault OSSIM

Ranking in Security Information and Event Management (SIEM)

13th

Average Rating

7.4

Reviews Sentiment

7.1

Number of Reviews

Ranking in other categories

No ranking in other categories

Splunk Enterprise Security

Ranking in Security Information and Event Management (SIEM)

1st

Average Rating

8.4

Reviews Sentiment

7.3

Number of Reviews

376

Ranking in other categories

Log Management (2nd), IT Operations Analytics (1st)

Mindshare comparison

As of February 2026, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 1.7%, down from 4.2% compared to the previous year. The mindshare of Splunk Enterprise Security is 7.1%, down from 9.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Security Information and Event Management (SIEM) Market Share Distribution
Product	Market Share (%)
Splunk Enterprise Security	7.1%
AlienVault OSSIM	1.7%
Other	91.2%

Security Information and Event Management (SIEM)

Featured Reviews

Brandon Pearce

Independent Contractor at a comms service provider with 5,001-10,000 employees

Enables cost-effective security management for small businesses

Scaling for USM is always challenging for any product unless it is purpose-built or overbuilt at the front end. They will use Palo Alto and its competitors, and LevelBlue will manage that implementation. The main area where the AlienVault product was lacking around the 2018 timeframe was in its ability to scale. By pushing it to a cloud-based system, they've largely alleviated scale issues. It's native in Amazon but will also run in Azure. They have worked with cloud service providers to offer enough throughput at a cost reasonable for a corporation. Scaling was their biggest problem, and they've largely conquered those issues.

Read full review

reviewer1469784

Senior Manager at a financial services firm with 10,001+ employees

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.

Read full review

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"It has helped us remediate threats in the past by providing significant events that assisted in identifying suspicious activities, such as logins from multiple countries."

"Network traffic analysis is highly efficient."

"The paid version of the solution has reporting and better scalability options."

"You can customize the dashboards as well as the reporting."

"OSSIM is the only solution that includes the large number of modules that we need: a vulnerability scanner, a network IDS system, a host IDS system."

"The open vault component and the checking of vulnerabilities are the most valuable features. The page management helps with this. If you know how your device is vulnerable at least you can do something about it."

"The most valuable features of this solution are the data correlation and vulnerability assessment."

"You pay monthly for the solution. I think it's one of the best products. If you compare with other companies, like LogRhythm, etc., the top 8 or 10 CMs, I think Alien Vault has the best price-performance ratio."

More AlienVault OSSIM pros

"The feature that we use the most is the correlation search engine within ES."

"It is very easy to use and integrate. There are connectors for every technology."

"The ability to quickly search logs, performance data, and other inputs has helped tremendously with troubleshooting."

"We can automatically suspend or terminate suspicious sessions."

"It's extremely scalable. It's a very robust solution and certainly has the capability of handling far bigger data requirements than a lot of the other tools. Generally what ends up happening with me is that my clients tend, for the most part, to be mid-tier organizations where the cost of that solutions would be accompanying requirements for people just becomes way too prohibitive. Especially considering the model that they use for costing, which is based on the volume of data. Of course, they're going to put everything including the Coke machine as the ability to collect data off of it, because of course the more they can put through the tool the more money they make."

"The most valuable feature is the log aggregation, being able to scan through all of the logs."

"The most valuable features of Splunk Enterprise Security are the enterprise search bar and the dashboards."

"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."

More Splunk Enterprise Security pros

Cons

"It's so hard to configure and explore something new on it."

"The initial setup was a bit complex. You've got to do a lot of reading. It's not an intuitive implementation."

"It's under heavy traffic. If you have heavy traffic, the system is slow."

"The solution needs more integration with cyber intelligence systems."

"The solution is not scalable."

"There are somewhat more false positives with the user behavior analytics, which could benefit from an additional machine learning model to detect user patterns more rapidly."

"The user interface could be improved."

"I don't like to work on OSSIM because it is unpredictable."

More AlienVault OSSIM cons

"This solution could be improved by better pricing in general and by easier installation."

"Stability is there, but every release has some bugs."

"The product's price may be an area of concern where improvements are required."

"It is important to make sure that everything is built off of the threat models and all the underlying items within Splunk."

"The main issue that I have with it is that the field transformations sometimes overlap with those in Splunk Enterprise, and then you get permissions issues that lead to troubles."

"Splunk Enterprise Security can be improved mainly regarding the UI, which can be daunting at first for newer employees."

"The on-premise integration with SOAR could be more simple; the cloud version integrates with SOAR very easily, but the on-premise SOAR and on-premise Splunk Enterprise Security are really not that easy, so I would appreciate if that could be improved."

"I would like additional features in different programming models with the support for writing queries in SQL or other languages, such as C#, Java, or some other type of query definitions."

More Splunk Enterprise Security cons

Pricing and Cost Advice

"OSSIM is open source, and USM is the paid license. So, if you want, you can switch to USM. There you will have to buy a license, and they have a support team that helps you out on issues you face."

"We are using a free version of the solution. If you purchase a license there are more features available but the price is a little high. The solution should be cheaper to allow more customers to be able to afford it."

"AlienVault OSSIM is free."

"AlienVault OSSIM is expensive compared to its competitors."

"AlienVault OSSIM is an open-source solution."

"The tool's licensing costs are yearly."

"The solution is open source, so it's free to use."

"AlienVault pricing is the best. Whatever cost you are paying, you are getting a return on every penny... It's not like your IBM, your QRadar, or Splunk, where the cost is too high."

More AlienVault OSSIM pricing and cost advice

"Splunk is really expensive."

"The pricing can be better. We are already considering Elastic because Splunk is too expensive. You have to pay based on per-day ingestion. There should be a more flexible model for the use cases where one day you have a huge amount, and on other days, it is quite less."

"The Splunk licensing is high."

"The cost is on the high end, which makes it difficult for some organizations to use."

"The variables and the flexibility that Splunk provides are helpful, especially in a hybrid and multi-cloud environment."

"Splunk Enterprise Security is an expensive solution."

"It is quite expensive."

"It is expensive. That is why many customers have moved to IBM QRadar. The price is definitely a challenge for customers."

More Splunk Enterprise Security pricing and cost advice

See which vendors are best for you

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Comparison Review

Vinod Shankar

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…

Read full review

Top Industries

By visitors reading reviews

Computer Software Company

11%

Comms Service Provider

11%

Manufacturing Company

Financial Services Firm

12%

Computer Software Company

10%

Manufacturing Company

Government

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	18
Midsize Enterprise	9
Large Enterprise	8

By reviewers
Company Size	Count
Small Business	110
Midsize Enterprise	50
Large Enterprise	265

Questions from the Community

What do you like most about AlienVault OSSIM?

Asset discovery is good.

See all answers

What is your experience regarding pricing and costs for AlienVault OSSIM?

It depends. I would need to review their cost models, but generally, they are on a scaled basis based on throughput usage. Because it's a software as a service solution for their core product for U...

See all answers

What needs improvement with AlienVault OSSIM?

See all answers

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...

See all answers

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 ...

See all answers

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...

See all answers

Comparisons

Wazuh vs AlienVault OSSIM

Compared 39% of the time

Venusense USM vs AlienVault OSSIM

Compared 10% of the time

USM Anywhere vs AlienVault OSSIM

Compared 6% of the time

Elastic Security vs AlienVault OSSIM

Compared 4% of the time

IBM Security QRadar vs AlienVault OSSIM

Compared 2% of the time

More AlienVault OSSIM Competitors

IBM Security QRadar vs Splunk Enterprise Security

Compared 10% of the time

Wazuh vs Splunk Enterprise Security

Compared 5% of the time

Sentinel vs Splunk Enterprise Security

Compared 5% of the time

Dynatrace vs Splunk Enterprise Security

Compared 4% of the time

Datadog vs Splunk Enterprise Security

Compared 3% of the time

More Splunk Enterprise Security Competitors

Product Reports

Buyer's Guide

AlienVault OSSIM

February 2026

Download AlienVault OSSIM product report

Buyer's Guide

Splunk Enterprise Security

January 2026

Download Splunk Enterprise Security product report

Also Known As

OSSIM

No data available

Overview

AlienVault OSSIM, Open Source Security Information and Event Management (SIEM), provides you with a feature-rich open source SIEM complete with event collection, normalization and correlation. Launched by security engineers because of the lack of available open source products, AlienVault OSSIM was created specifically to address the reality many security professionals face: A SIEM, whether it is open source or commercial, is virtually useless without the basic security controls necessary for security visibility.

AT&T

Splunk Enterprise Security delivers powerful log management, rapid searches, and intuitive dashboards, enhancing real-time analytics and security measures. Its advanced machine learning and wide system compatibility streamline threat detection and incident response across diverse IT environments.

Splunk Enterprise Security stands out in security operations with robust features like comprehensive threat intelligence and seamless data integration. Its real-time analytics and customizable queries enable proactive threat analysis and efficient incident response. Integration with multiple third-party feeds allows detailed threat correlation and streamlined data visualization. Users find the intuitive UI and broad compatibility support efficient threat detection while reducing false positives. Despite its strengths, areas such as visualization capabilities and integration processes with cloud environments need enhancement. Users face a high learning curve, and improvements in automation, AI, documentation, and training are desired to maximize its potential.

What Are the Key Features of Splunk Enterprise Security?

Log Management: Efficiently manages and organizes a vast amount of logs for better data handling.
Rapid Data Search: Quickly retrieves relevant data for fast decision-making.
Flexible Dashboards: Customizable dashboards provide clear data visualization.
Comprehensive Threat Intelligence: Offers detailed insights to preemptively defend against threats.
Real-Time Analytics: Analyzes data in real-time to enhance response times.
Integration with Third-Party Feeds: Streamlines information flow from multiple sources.

What Benefits Should Users Investigate in Reviews?

Efficient Incident Response: Enhances the ability to respond promptly to threats.
False Positive Reduction: Minimizes incorrect threat alarms, making monitoring more efficient.
Threat Detection Speed: Accelerates the identification and evaluation of security threats.
Cost-Effectiveness: Potential savings through better licensing options and operational efficiency.
User Adaptability: Enhancements in documentation and training resources aid in overcoming the learning curve.

In specific industries like finance and healthcare, Splunk Enterprise Security is instrumental for log aggregation, SIEM functionalities, and compliance monitoring. Companies leverage its capabilities for proactive threat analysis and response, ensuring comprehensive security monitoring and integration with various tools for heightened operational intelligence.

Splunk

Sample Customers

Council Rock School District

Splunk has more than 7,000 customers spread across over 90 countries. These customers include Telenor, UniCredit, ideeli, McKenney's, Tesco, and SurveyMonkey.

Buyer's Guide

AlienVault OSSIM vs. Splunk Enterprise Security

February 2026

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