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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
 

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 AlienVault OSSIM's interface is outdated and it lacks scalability compared to Splunk.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

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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
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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
31
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
ProductMarket Share (%)
Splunk Enterprise Security7.1%
AlienVault OSSIM1.7%
Other91.2%
Security Information and Event Management (SIEM)
 

Featured Reviews

BP
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 - PeerSpot reviewer
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

"AlienVault OSSIM is an enterprise solution that sells easily. It is rated highly by organizations."
"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."
"Better than other SIEM solutions because almost everything can be integrated."
"The most valuable features of this solution are the data correlation and vulnerability assessment."
"Asset discovery is good."
"With AlienVault you get everything in one box."
"The solution is free to use."
"The most valuable features of AlienVault OSSIM are vulnerability assessment, network intrusion detection system, response to critical events, and awareness of the whole network."
More AlienVault OSSIM pros
"I like the ease with which dashboards can be created."
"What I really like is that even if you have already collected the data, you can extract fields and can build searches."
"What I appreciate about Splunk Enterprise Security is creating the newest SPL for network traffic and using the risk-based alerting feature that helps my organization by allowing me to learn more information about Splunk every day because it is a big platform."
"The ability to manage large amounts of generated data and to protect all devices from unauthorized use are the most valuable features."
"The best features I've experienced over the past six years with Splunk Enterprise Security are the ability to create use cases and the flexibility to customize searches and use cases based on our specific requirements."
"Good for log collection and log management."
"I have also been able to take advantage of some of the more complex statistical capabilities when analyzing logs."
"Splunk Enterprise Security provides the foundation for unified threat detection, investigation, and response, enabling fast identification of critical issues."
More Splunk Enterprise Security pros
 

Cons

"It's under heavy traffic. If you have heavy traffic, the system is slow."
"The incidence reporting could be better."
"It takes some time. It does not give me a prompt response for any such [malicious] traffic. It takes time to get that alert from the AlienVault system."
"The price of this solution is very high and it could be cheaper."
"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."
"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 needs to be friendlier across the board."
"I don't like to work on OSSIM because it is unpredictable."
More AlienVault OSSIM cons
"My biggest struggle with Splunk in general is memorizing all the commands. If I want to know which users have logged in between certain hours, I cannot write that query out. It would be helpful to have AI so that I can explain in simple terms what I want and then the search gives that back to me. I am waiting for that."
"Splunk has a steeper learning curve, making it feel less user-friendly."
"Splunk could enhance its services by providing more comprehensive professional assistance aimed at optimizing our investment."
"Its user interface for everything other than the charts can be improved. Some parts of it can be simplified a bit, such as when importing documents that have the network traffic. When you're going through the information about the network traffic, you have to have the expertise, but even if a program is supposed to be for IT support, it is good to make it user-friendly because it gets easier to train people. When something goes wrong, the more difficult a program is in terms of UI, the harder it is to fix the issue."
"Sometimes the communication with support happens with multiple staff. They should reduce the time to resolution."
"If we want to filter alerts, currently it's a very manual process. We identify IP addresses and usernames and must manually filter them."
"Splunk could have more built-in use case presets that customers can build on and customize."
"The search could be improved. Now, it is a bit difficult to write search queries because they become quite long, then maintaining those long search queries is a quite challenging."
More Splunk Enterprise Security cons
 

Pricing and Cost Advice

"AlienVault OSSIM is free."
"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."
"The licensing fees for the non-community edition are paid on an annual basis, and there are no costs in addition to this."
"AlienVault OSSIM is an open-source solution."
"AlienVault OSSIM is expensive compared to its competitors."
"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."
"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."
"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
"The pricing is very complicated, and it is very pricey. You do require a lot of different licenses in order to get a comprehensive solution that is not just the SIEM solution."
"Splunk is definitely not a cheap solution. It is an expensive product."
"Splunk is expensive based on our current requirements, but it's obviously worth what we pay."
"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."
"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."
"It's more expensive than the other tools, but it's worth it. Every penny is worth it."
"In terms of pricing, I believe Splunk is unreasonably costly for the majority of mid and small-sized companies."
"The pricing model is based on the number of gigabytes that you ingest into the Splunk system. So it can be an expensive solution."
More Splunk Enterprise Security pricing and cost advice
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Comparison Review

VS
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
9%
Educational Organization
8%
Financial Services Firm
13%
Computer Software Company
10%
Manufacturing Company
9%
Government
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business18
Midsize Enterprise9
Large Enterprise8
By reviewers
Company SizeCount
Small Business109
Midsize Enterprise50
Large Enterprise264
 

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?
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 implement...
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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Venusense USM vs AlienVault OSSIM Logo
Venusense USM vs AlienVault OSSIM
Compared 10% of the time
USM Anywhere vs AlienVault OSSIM Logo
USM Anywhere vs AlienVault OSSIM
Compared 7% of the time
Elastic Security vs AlienVault OSSIM Logo
Elastic Security vs AlienVault OSSIM
Compared 4% of the time
LogRhythm SIEM vs AlienVault OSSIM Logo
LogRhythm SIEM vs AlienVault OSSIM
Compared 2% of the time
More AlienVault OSSIM Competitors
IBM Security QRadar vs Splunk Enterprise Security Logo
IBM Security QRadar vs Splunk Enterprise Security
Compared 10% of the time
Wazuh vs Splunk Enterprise Security Logo
Wazuh vs Splunk Enterprise Security
Compared 5% of the time
Sentinel vs Splunk Enterprise Security Logo
Sentinel vs Splunk Enterprise Security
Compared 4% of the time
Dynatrace vs Splunk Enterprise Security Logo
Dynatrace vs Splunk Enterprise Security
Compared 4% of the time
Datadog vs Splunk Enterprise Security Logo
Datadog vs Splunk Enterprise Security
Compared 3% of the time
More Splunk Enterprise Security Competitors
 

Product Reports

Buyer's Guide
AlienVault OSSIM
January 2026
AlienVault OSSIM reportDownload AlienVault OSSIM product report
Buyer's Guide
Splunk Enterprise Security
January 2026
Splunk Enterprise Security reportDownload 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
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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.