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 375 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 AlienVault OSSIM's interface is outdated and it lacks scalability compared to Splunk.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

375

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.

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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.

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Quotes from Members

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

Pros

"AlienVault OSSIM is an enterprise solution that sells easily. It is rated highly by organizations."

"There are a lot of people you will find using OSSIM since they are also offering OTX as a service"

"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."

"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."

"The solution has a very good open source community, and whenever we have problems, we are always able to resolve it online."

"The product is easy to use."

"The product is majorly used for threat detection of the agents on servers and endpoints."

More AlienVault OSSIM pros

"Splunk Enterprise Security helps my SOC team prioritize and investigate high-fidelity alerts more effectively by enabling us to quickly gather information, collaborate, and provide various teams with access to the same information, allowing them to follow the workflow to complete the task."

"Without Splunk Enterprise Security, it would be difficult for us to manage and prioritize alerts. There's a potential to lose track of important notifications, and it's essential to our security that we do not miss anything. Splunk has improved our investigations because the reporting and dashboarding make things so much easier. We can provide weekly or monthly reports. I also like Splunk's ability to integrate."

"The feature that I have found most valuable with Splunk is the ability to sift through a bunch of data very quickly."

"The stock analysts and security people use one single dashboard (one single location) to check our logs."

"The initial setup is really straightforward. It's one of the easiest installations."

"It's standardized and easy to use, so you don't have to have a lot of top-tier analysts to do the same job."

"The solution is stable and reliable."

"The query functionality is very easy to use and fast to retrieve logs in comparison to other SIEM solutions."

More Splunk Enterprise Security pros

Cons

"The price of this solution is very high and it could be cheaper."

"The solution is not scalable."

"The correlation engine needs to be improved."

"AlienVault OSSIM is costly."

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

"The documentation could be improved."

"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."

More AlienVault OSSIM cons

"Splunk is not very user-friendly. It has a complex architecture in comparison to other solutions on the market."

"Splunk Enterprise Security can be improved by having more focus on the data health monitoring aspect, which will definitely be helpful."

"Sometimes talking through email isn't the most effective method, as they go through troubleshooting steps we've already taken, which requires additional back-and-forth communication."

"It's costly."

"I do not have any pain points for Splunk Enterprise Security. I am still trying to learn it, but there can be more information on the education side for Splunk Enterprise Security. It would be nice if the certification path was more specific to what I use instead of being so broad."

"I'd love to see more integrations, which is one of the primary points of the key node with Splunk Enterprise Security."

"While Splunk offers SOAR as a separate product, integrating it into the next version of Splunk Enterprise Security as a unified solution would be beneficial."

"They could offer pre-built search queries for everyday use cases like brute force attacks, DDoS attacks, and other security threats."

More Splunk Enterprise Security cons

Pricing and Cost Advice

"OSSIM is free."

"AlienVault OSSIM is an open-source solution."

"I used the paid version of the tool and found it to be expensive. It has been a while since I changed to Securonix. I will have to check whether AlienVault charges per device, user, or log."

"We are using the community version, which can be used for free."

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

"The licensing fees for the non-community edition are paid on an annual basis, and there are no costs in addition to this."

"The tool's licensing costs are yearly."

"When comparing AlienVault OSSIM to Microsoft Sentinel, AlienVault OSSIM incurs additional costs due to its licensing price structure. If you are using AlienVault for security purposes at a certain level it can have a higher price point than the current pricing of Microsoft Sentinel."

More AlienVault OSSIM pricing and cost advice

"Its pricing model can be improved."

"Splunk Enterprise Security is expensive."

"In addition to the licensing fee, there is also a support and maintenance charge."

"Price-wise, if you compare QRadar to Splunk for SIEM functionality then they are in the same range but when you integrate SOAR with these solutions, Splunk takes the lead and is more competitive."

"While Splunk is more expensive than other solutions, we would still choose it because of its capabilities."

"From what I have seen so far, Splunk has multiple cost models. The one that we are using is pretty good when it comes to ingesting data into the environment. It has worked out pretty well."

"Be upfront about your needs and expectations. Splunk is great to work with."

"Splunk is really expensive compared to all the other tools on the market, including Microsoft Sentinel."

More Splunk Enterprise Security pricing and cost advice

See which vendors are best for you

Use our free recommendation engine to learn which Security Information and Event Management (SIEM) solutions are best for your needs.

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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	109
Midsize Enterprise	50
Large Enterprise	264

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...

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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

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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

AWS Security Hub 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

Free Report: AlienVault OSSIM vs. Splunk Enterprise Security

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