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

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 AlienVault OSSIM's interface is outdated and it lacks scalability compared to Splunk.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

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.

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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

"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 most valuable features of AlienVault OSSIM are vulnerability assessment, network intrusion detection system, response to critical events, and awareness of the whole network."

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

"Network traffic analysis is highly efficient."

"The tool's security detection is good. It helps us with login tracking and generating reports. We aim to identify potential issues, such as brute-force attacks on user accounts or server-level anomalies. For instance, if I receive a report indicating a server is at an abnormal level, I investigate and address the issue."

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

"Better than other SIEM solutions because almost everything can be integrated."

"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."

More AlienVault OSSIM pros

"Splunk Enterprise Security would provide better capabilities and out-of-box detections."

"The features of Splunk Enterprise Security that I have found most valuable include the risk-based score and UBA/UEBA, user behavior analytics, or user and entity behavior analytics."

"The most valuable feature is that it's very good for log aggregation."

"This is a straightforward solution, easy to configure."

"The tool helps with advanced reports and keeps the system scalable and flexible. It provides a clear picture of the current status of any incidents. As a CISO, I see a lot of potential for future innovation, which is interesting. I've noticed better performance, especially with the reports."

"The most valuable features are the logs, which allow us to identify what happened and who interacted with the web repository."

"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."

"Splunk Enterprise Security enhances business resilience and assists with threat detection by centralizing security data."

More Splunk Enterprise Security pros

Cons

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

"AlienVault OSSIM gives unwanted notifications."

"Sometimes technical issues take very long to get resolved."

"The user interface could be improved."

"I would like the solution to be able to integrate with my firewall, my IDS and my Honeypot solutions so that it can provide real-time reporting as things occur and then have alert sent to me on my phone when suspicious activity is happening."

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

"The incidence reporting could be better."

"When comparing AlienVault OSSIM to other solutions it looks a bit outdated. Additionally, they need to improve their integration."

More AlienVault OSSIM cons

"It needs integration with a configuration management solution."

"I encounter issues such as downtime, bugs, glitches, and unbox errors."

"One main change I would suggest is related to the incident board: when an incident is resolved, it should not appear on the incident board."

"I would like to see future development in terms of ML (Machine Learning)."

"There is a definite learning curve to starting out."

"The user experience could be improved."

"We see quite a few issues on stability. Even last week, we faced something, and identifying bottlenecks is not easy."

"Splunk can improve regex/asset analysis as we do not want to crawl until it is done."

More Splunk Enterprise Security cons

Pricing and Cost Advice

"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."

"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."

"OSSIM is free."

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

"AlienVault OSSIM is expensive compared to its competitors."

"AlienVault OSSIM is free."

"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."

"AlienVault OSSIM is an open-source solution."

More AlienVault OSSIM pricing and cost advice

"Splunk Enterprise Security is a worthwhile investment given the comprehensive range of features it offers."

"The price of this solution is expensive. However, it has great features. If you want a great solution you need to pay a price matching the features."

"Splunk Enterprise Security is not a cheap product, but I think it is worth every dollar that you pay."

"It can be cost-prohibitive when you start to scale and have terabytes of data. Its cost model is based on how much data it processes a day. If they're able to create scaled-down niche or custom package offerings, it may help with the cost. Instead of the full-blown features, if they can narrow the scope where it can only be used for a specific purpose, it would kind of create that market for the product, and it may help with the costing. When you start using it as a central aggregator and you're pumping tons of logs at it, pretty soon, you'll start hitting your cap on what it can process a day. Once you've got that, you're kind of defeating the purpose because you're going to have to scale back."

"Luckily, we come under a large federal agency, and before the pandemic, they signed a large enterprise license agreement. It worked out great and to our advantage because we are a small organization. We got a 300 gig license, and we just did not have the buying power to be able to get products cheaply. Because we all partnered together under the agency umbrella, we were able to get Splunk Enterprise Security, UBA, and ITSI for cheap. This was good considering the fact that some of these premium apps require a minimum number of users, and we do not have the number of people needed to even justify buying it."

"In terms of pricing, I believe Splunk is unreasonably costly for the majority of mid and small-sized companies."

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

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

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

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...

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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...

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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 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

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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

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