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 #12 with an average rating of 7.2, while Splunk is ranked #1 with an average rating of 8.3. AT&T holds a 1.9% mindshare in SIEM, compared to Splunk’s 7.4% 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

4,311 Views
4,225 Comparison Views

80% willing to recommend

Splunk Enterprise Security

Read 375 Splunk Enterprise Security reviews

24,784 Views
12,888 Comparison Views

94% willing to recommend

AlienVault OSSIM

Splunk Enterprise Security

Comparison Buyer's Guide

Download the report

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 AlienVault OSSIM's interface is outdated and it lacks scalability compared to Splunk.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: December 2025).

Buyer's Guide

AlienVault OSSIM vs. Splunk Enterprise Security

December 2025

Download the complete report

Helped 881,282 peers since 2012

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)

12th

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 January 2026, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 1.9%, down from 4.3% compared to the previous year. The mindshare of Splunk Enterprise Security is 7.4%, down from 10.0% 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	7.4%
AlienVault OSSIM	1.9%
Other	90.7%

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

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

"With AlienVault you get everything in one box."

"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."

"The threat policies of the solution are always very advanced and the best in the market. They are very persistent in terms of keeping up with security protocols."

"Inbuilt IDS, inbuilt integration with threat intelligence platform and with vulnerability assessment modules."

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

"AlienVault OSSIM's GUI is very user-friendly."

"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."

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."

"The integration and plugin availability are nice, and the AI module is also great."

"The most valuable features in Splunk are the search function and the ability to run selected session reports. The session reports are important because I can use them to see what is going on in our environment weekly. Additionally, we can use the graph to see how often that particular event is happening."

"It is very scalable."

"The compatibility with the add-ons helps us add more data in the same compatible format and use data models to elaborate and make it faster."

"The most valuable function is the notable events. When I joined the team, I asked them what they could currently see, and they said nothing. I was pretty shocked. I know for a fact that they're using Enterprise Security or at least they had purchased it. I told them that there are several dashboards within Splunk that we can leverage. There is also notable events where we can see potential incidents or potential alerts about the infrastructure and the network itself."

"The solution's most valuable feature is its data modeling."

"Splunk works based on parsing log files."

More Splunk Enterprise Security pros

Cons

"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."

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

"They can add more compliance templates."

"AlienVault OSSIM failed to provide our company a full insight, while also giving out a lot of false positives."

"AlienVault OSSIM’s configuration and integration could be a little easier."

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

"Lacking in depth of reporting."

"AlienVault OSSIM is costly."

More AlienVault OSSIM cons

"Delays in responses from the technical team can pose challenges for both vendors and clients, especially considering that Splunk applications and machine solutions are critical assets."

"Regarding room for improvement, I expect Splunk to provide information about new features on a regular basis, such as notifications about enhancements that may improve security posture."

"Splunk Enterprise Security can be improved with better triage capability and less dependency on running SPL searches, which would allow analysts who may not have much experience in writing SPL searches to still use the tool and run investigations."

"For on-premise, it's more about optimization. With such a heavy byte scale of data that we are operating on, the search for disparate data sometimes takes about a minute. This is understandable considering the amount of data that we are pumping into it. The only optimization that I recommend is better sharding, when it comes to Splunk, so that data retrieval can be faster."

"I would like to get visibility into the data pipelines on heavy forwarders and indexers to see exactly their source and the cause of saturation when it occurs. This would help us learn even more about our high use applications."

"The cluster environment should be improved. We have a cluster. In the Splunk cluster environment, in the case of heavy searches and heavy load, the Splunk cluster goes down, and we have to put it in the maintenance mode to get it back. We are not able to find the actual culprit for this issue. I know that cluster has RF and SF, but it has been down so many times. There should be something in Splunk to help users to find the reason and the solution for such issues."

"Splunk could be improved by reducing the cost. The cost is one of the biggest challenges for us in keeping to our production requirements."

"The training was mostly sales-focused, like how to monitor your sales. It was hard to then come back from doing the training and try to switch it to a cybersecurity focus because all the training we did was sales oriented. The basic training didn't really touch on any kind of cybersecurity use cases or anything like that. That would have been great to see in the training."

More Splunk Enterprise Security cons

Pricing and Cost Advice

"AlienVault OSSIM is free."

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

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

"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 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."

"The price of AlienVault OSSIM is too high sometimes for us to present to our customers. The price should be lower. We are on a three-year license to use the solution. We had to pay extra for the support."

"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."

"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

"Splunk Enterprise Security is an expensive solution."

"Its price is fair. Like with anything else, if you go into the cloud, different providers cost more, and you are able to throttle back or throttle up. The cost is comparable with anything else."

"Splunk's cost is very high. They need to review the pricing. They have to go back and totally readdress the market."

"Truly evaluate the data you want to ingest and go slow. Pulling in data that can provide no use to your mission only wastes data against your license."

"The pricing seems good relative to the other vendors that we have had here. However, they need to find ways to be more flexible with the licensing and be able to deal with situations where we start generating more logs. Maybe having some controls in the Splunk interface to turn it off, so we don't have to change anything in our application."

"The licensing costs are high for Splunk Enterprise Security."

"Splunk can be an expensive solution. It all depends on how we configure the alerts and the events from the endpoints. You can save some money if you do that correctly. If not, it becomes an expensive solution."

"Expensive compared to other options."

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.

See recommendations

881,282 professionals have used our research since 2012.

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

13%

Comms Service Provider

11%

Financial Services Firm

Manufacturing Company

Financial Services Firm

13%

Computer Software Company

11%

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...

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 45% of the time

Venusense USM vs AlienVault OSSIM

Compared 9% of the time

USM Anywhere vs AlienVault OSSIM

Compared 7% of the time

Elastic Security vs AlienVault OSSIM

Compared 4% of the time

Rapid7 InsightIDR vs AlienVault OSSIM

Compared 2% of the time

More AlienVault OSSIM Competitors

IBM Security QRadar vs Splunk Enterprise Security

Compared 9% of the time

Wazuh vs Splunk Enterprise Security

Compared 5% of the time

Dynatrace vs Splunk Enterprise Security

Compared 4% of the time

Sentinel 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

January 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

December 2025

Free Report: AlienVault OSSIM vs. Splunk Enterprise Security

Find out what your peers are saying about AlienVault OSSIM vs. Splunk Enterprise Security and other solutions. Updated: December 2025.

DOWNLOAD NOW

881,282 professionals have used our research since 2012.

See our AlienVault OSSIM vs. Splunk Enterprise Security report.

See our list of best Security Information and Event Management (SIEM) vendors.

We monitor all Security Information and Event Management (SIEM) reviews to prevent fraudulent reviews and keep review quality high. We do not post reviews by company employees or direct competitors. We validate each review for authenticity via cross-reference with LinkedIn, and personal follow-up with the reviewer when necessary.