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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 #12 with an average rating of 7.4, while Splunk is ranked #1 with an average rating of 8.3. AT&T holds a 2.4% mindshare in SIEM, compared to Splunk’s 8.7% mindshare. Additionally, 80% of AT&T users are willing to recommend the solution, compared to 93% of Splunk users who would recommend it.
AlienVault OSSIM
Read 31 AlienVault OSSIM reviews
  • 4,632 Views
  • 4,539 Comparison Views
80% willing to recommend
Splunk Enterprise Security
Read 369 Splunk Enterprise Security reviews
  • 23,960 Views
  • 12,459 Comparison Views
93% willing to recommend
 

Comparison Buyer's Guide

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Executive SummaryUpdated on Oct 19, 2025

Splunk Enterprise Security and AlienVault OSSIM compete in the security information and event management (SIEM) category. Splunk appears to have the upper hand due to its comprehensive feature set, making it ideal for larger enterprises with expansive needs.

Features: Splunk Enterprise Security offers advanced threat detection, customizable dashboards, and extensive data integration, supporting rapid incident response with robust analytics and app integration. AlienVault OSSIM, based on an open-source foundation, provides centralized management and ease of integration, geared towards budget-conscious organizations seeking essential security operations.

Room for Improvement: Splunk could enhance operational workflows, visualizations, and user access control to reduce complexity, especially for non-technical users. AlienVault OSSIM should improve integration capabilities, threat intelligence management, scalability, and the user interface to enhance overall usability.

Ease of Deployment and Customer Service: Splunk offers flexibility in both cloud and on-premises environments but is often complex, with varying support quality. AlienVault OSSIM's simpler deployment arises from its open-source nature, but it largely relies on community support due to the lack of a comprehensive support infrastructure.

Pricing and ROI: Splunk's high-priced data ingestion model is offset by its expansive features and high ROI for large enterprises. AlienVault OSSIM provides a free version along with cost-effective paid options, offering a good ROI for organizations with basic security needs, though advanced configurations may necessitate further investment and expertise.

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To learn more, read our detailed AlienVault OSSIM vs. Splunk Enterprise Security Report (Updated: September 2025).
Buyer's Guide
AlienVault OSSIM vs. Splunk Enterprise Security
September 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)
12th
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
369
Ranking in other categories
Log Management (2nd), IT Operations Analytics (1st)
 

Mindshare comparison

As of November 2025, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 2.4%, down from 4.3% compared to the previous year. The mindshare of Splunk Enterprise Security is 8.7%, down from 10.9% 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 Security8.7%
AlienVault OSSIM2.4%
Other88.9%
Security Information and Event Management (SIEM)
 

Featured Reviews

HarshBhardiya - PeerSpot reviewer
An open-source solution that provide good detection and more visibility
The solution is not scalable. It impacts so hard. In the initial stages, AlienVault OSSIM can be suitable for small environments. There may be limitations if the customer expresses a desire to expand and add more devices. In such cases, we would need to either explore additional solutions or work within the constraints of the existing setup. We have set up alerts and configured everything in AlienVault OSSIM. It actively monitors for any security incidents. It provides us with regular updates and notifications about any ongoing activities. Only one person is using the solution. It is the perfect solution for small businesses. I rate the solution’s scalability a three out of ten.
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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.
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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

"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."
"I recommend it due to the experience of the people running it."
"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 initial setup was straightforward. I didn't have any problems."
"The initial setup is straightforward."
"Network traffic analysis is highly efficient."
"The most valuable features of AlienVault OSSIM are vulnerability assessment, network intrusion detection system, response to critical events, and awareness of the whole network."
"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."
More AlienVault OSSIM pros
"With good domain knowledge, one can build almost anything. If you throw in Alert Manager or an integration with ServiceNow. Then, you have your own SIEM"
"Now with Splunk Enterprise Security, we have everything in one place—the notables are created automatically, but they can also create their own notables based on the investigation, which improved and reduced about 50% of the manual work that was done before versus what we are doing now."
"It gives us the liberty to do more in terms of use cases."
"Alerts when a server is malfunctioning, monitors external attacks, and takes action to stop spreading viruses."
"I evaluate customer service and technical support as great."
"The benefits my company has seen from the use of Splunk Enterprise Security revolve around the speed of detection it offers."
"The data analysis part is good in Splunk, which is something that I like the most. It is also quite easy to use. Its dashboards, visualizations, and analytics are good."
"You can use it to gather syslog messages from anything."
More Splunk Enterprise Security pros
 

Cons

"There needs to be more support or some kind of training program so users can self-learn the system more effectively."
"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 suggest more in-built rules based on modern threats and environments to make it a more competitive solution."
"The solution is not scalable."
"The solution needs more integration with cyber intelligence systems."
"The incidence reporting could be better."
"AlienVault OSSIM is costly."
"The user interface needs to be friendlier across the board."
More AlienVault OSSIM cons
"The historical data extraction needs improvement. I would like the capability of taking data and having it trend longer."
"Splunk ES could have more pre-built integrations and rules. The detection is fairly accurate, but it depends on the rules you create. Splunk's out-of-the-box configuration isn't that useful."
"I want Splunk Enterprise Security to release more AI and machine learning features in the future."
"Over time I will have more requirements and I can foresee the solution could improve the search algorithm to run and output the data faster."
"The solution has a high learning curve for users. It's a little complicated when you're trying to figure out all the features and what they do."
"Some additional features that should be included in the next release of Splunk Enterprise Security are an integrated Attack Range, not as a separate solution, providing a way to test the rules in the production environment."
"I would like to see ability to master management. In terms of clustering, how it manages clustering needs improvement."
"Its pricing is extremely high. There are other tools out in the market that are competitive. They do not necessarily have all the functionality, but they are competitive. The professional services we have used have been high as well in comparison to the market."
More Splunk Enterprise Security cons
 

Pricing and Cost Advice

"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."
"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."
"AlienVault OSSIM is expensive compared to its competitors."
"We are using the community version, which can be used for free."
"The solution is open source, so it's free to use."
"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."
More AlienVault OSSIM pricing and cost advice
"The licensing costs are high for Splunk Enterprise Security."
"My customers have found the price of the solution to be high."
"The solution is costly."
"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 tool's licensing is good and we haven't received any complaints from the team handling it."
"It is expensive. That is why many customers have moved to IBM QRadar. The price is definitely a challenge for customers."
"I think we recently switched to the SVC pricing compared to the ingest pricing."
"The pricing of Splunk Enterprise Security is high."
More Splunk Enterprise Security pricing and cost advice
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Comparison Review

VS
Feb 26, 2015
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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
14%
Comms Service Provider
12%
University
9%
Financial Services Firm
8%
Financial Services Firm
14%
Computer Software Company
14%
Manufacturing Company
8%
Government
7%
 

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 Business110
Midsize Enterprise50
Large Enterprise257
 

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

Wazuh vs AlienVault OSSIM Logo
Wazuh vs AlienVault OSSIM
Compared 67% of the time
Venusense USM vs AlienVault OSSIM Logo
Venusense USM vs AlienVault OSSIM
Compared 8% of the time
USM Anywhere vs AlienVault OSSIM Logo
USM Anywhere vs AlienVault OSSIM
Compared 8% of the time
Elastic Security vs AlienVault OSSIM Logo
Elastic Security vs AlienVault OSSIM
Compared 5% of the time
Rapid7 InsightIDR vs AlienVault OSSIM Logo
Rapid7 InsightIDR vs AlienVault OSSIM
Compared 3% of the time
More AlienVault OSSIM Competitors
IBM Security QRadar vs Splunk Enterprise Security Logo
IBM Security QRadar vs Splunk Enterprise Security
Compared 8% of the time
Wazuh vs Splunk Enterprise Security Logo
Wazuh vs Splunk Enterprise Security
Compared 6% of the time
Dynatrace vs Splunk Enterprise Security Logo
Dynatrace vs Splunk Enterprise Security
Compared 6% of the time
Datadog vs Splunk Enterprise Security Logo
Datadog vs Splunk Enterprise Security
Compared 4% of the time
Security Onion vs Splunk Enterprise Security Logo
Security Onion vs Splunk Enterprise Security
Compared 4% of the time
More Splunk Enterprise Security Competitors
 

Product Reports

Buyer's Guide
AlienVault OSSIM
November 2025
AlienVault OSSIM reportDownload AlienVault OSSIM product report
Buyer's Guide
Splunk Enterprise Security
October 2025
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
September 2025
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