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AlienVault OSSIM vs Splunk Enterprise Security comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Apr 6, 2025

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)
10th
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
7.6
Number of Reviews
306
Ranking in other categories
Log Management (2nd), IT Operations Analytics (1st)
 

Mindshare comparison

As of April 2025, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 3.9%, up from 3.6% compared to the previous year. The mindshare of Splunk Enterprise Security is 9.5%, down from 12.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Security Information and Event Management (SIEM)
 

Featured Reviews

Aman Aijaz - PeerSpot reviewer
An easy-to-scale open-source solution used for monitoring events on devices
The area for improvement is a lot. When I started using it on our enterprise side, the issue we faced was, for example, if we were running at that time on AlienVault OSSIM v5.7.4. So, for some orders, we had to install some packages, and when we tried installing that package, some dependencies got upgraded to a new version. Now once that dependency got upgraded, the SQL, since you might be aware that OSSIM uses SQL database, now SQL and all the dependency in everything was not on the same version, and that caused the database to crash. The aforementioned area should be eased out by upgrading the patches and upgrading dependencies. This kind of thing is a disadvantage of OSSIM, and I would like them to work on this. But I have also raised service requests many times and gave it a push on the community section too. However, since it is a local source, they don't reply much over there. That is why I don't like to work on OSSIM because it is unpredictable. Once the storage goes above 50 percent, it starts behaving unpredictably. If you get stuck with a situation, then you need to drill a lockdown into that. Sometimes you get no luck. Then you have to just reimage the server with the new fresh OS of AlienVault. As for additional features, not much because if you move to the newer version, it is kind of getting more stable. But, to make my life easier, then I would say try to give more features. I know it's open source, so they also cannot provide me with more features. But still, if they can provide me with more features because right now it's becoming old. Right now, we are even moving from SIEM to Security Data Lake. So when we move to it, this will be literally outdated. No one can even expect anything out of it. The way security is moving, it will be outdated very soon. They have to also provide something new to keep this going for the future also.
ROBERT-CHRISTIAN - PeerSpot reviewer
Has many predefined correlation rules and is brilliant for investigation and log analysis
It is very complicated to write your own correlation rules without the help of Splunk support. What Splunk could do better is to create an API to the standard SIEM tools, such as Microsoft Sentinel. The idea would be to make it less painful. In ELK Stack, Kibana is the query language with which you can search log files. I believe Splunk has also a query language in which they search their log files, but once you have identified the log file that you want to use for further security correlation, you want to very quickly transport that into your SIEM tool, such as Microsoft Sentinel. That is something that Splunk could make a little bit less painful because it is a lot of effort to find that log file and forward it. An API with Microsoft Sentinel or a similar SIEM tool would be a good idea.

Quotes from Members

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

Pros

"The most valuable features of AlienVault OSSIM are case management, ease of configuration, and investigation."
"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."
"The dashboard is the solution's most valuable aspect. It brings everything into one central point where I can actually look at it and go, "Okay, I understand what's going on.""
"The initial setup is straightforward."
"The most valuable features of AlienVault OSSIM are vulnerability assessment, network intrusion detection system, response to critical events, and awareness of the whole network."
"The most valuable features of this solution are the data correlation and vulnerability assessment."
"The solution is free to use."
"The technical support is among the best in the market."
"We can present to our management in real time the security of the batch management for the PCs, security regarding the network equipment. We're currently working in the Azure Cloud project, so we can send any logs from the cloud to Splunk. We can monitor them and we can present to the managers and customers. It's a very good solution for reporting. We use Splunk for reporting and monitoring of any solution in the company."
"Out-of-the-box, it seems very powerful."
"The most valuable features in Splunk Enterprise Security are the cluster capabilities."
"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 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."
"The ability to view all of these different logs, then drilling down into specific times or into specific data sources, has proved to be the greatest aspect in decreasing our troubleshooting overhead time."
"The breadth of the data sources that Splunk can ingest data from is broad and deep and it does an exemplary job at handling structured data."
 

Cons

"AlienVault OSSIM failed to provide our company a full insight, while also giving out a lot of false positives."
"The user interface could be improved."
"It's so hard to configure and explore something new on it."
"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 documentation could be improved."
"AlienVault OSSIM could improve by having better integration with some of the newer tools."
"They can add more compliance templates."
"The initial setup was a bit complex. You've got to do a lot of reading. It's not an intuitive implementation."
"The implementation and the scanning of the logs can be difficult."
"Its pricing model and integration with third-party services can be improved. We had faced an issue with integration. The alerting feature is currently not available with Splunk, but it is definitely available with Datadog and PagerDuty. They should include this feature. A few dashboards in Splunk look quite old and are not that modern. They aren't bad, but improving these dashboards will definitely make Splunk more attractive and usable. I read in a few blog posts that there were a few security incidents related to Splunk agents. So, it can be made more secure."
"We were inundated with the amount of alerts and alarms that we could get out of it. It is also a resource hog and we didn't have the resources to support it on-prem so we're taking it offline now."
"Writing queries is a bit complicated sometimes."
"If you monitor too much, you can lose performance on your systems."
"When you get into large amounts of data, Splunk can get pretty slow. This is the same on-premise or AWS, it doesn't matter. The way that they handle large data sets could be improved."
"When we do a rollout from the server or host or anything, we'd like to see more automation. It would save us time."
"Data retention can be better. If we want to look at the data for five months or six months, that is not available to us. We only have a history of 20 or 30 days. After that, the information gets lost. That is a drawback."
 

Pricing and Cost Advice

"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."
"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."
"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 free."
"AlienVault OSSIM is expensive compared to its competitors."
"The licensing fees for the non-community edition are paid on an annual basis, and there are no costs in addition to this."
"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."
"Most people share the same thought that the ingestion rates can get pretty pricey. There is a lot of work we do to curate the data that we send to Splunk so that it is not too noisy or too expensive."
"It is expensive. I work for multiple clients. I am working for more than five clients, but most of the clients are switching from Splunk to Sentinel because of the cost. Even though Sentinel is very limited, clients are moving to Sentinel."
"As a team, we prefer the old pricing model with a perpetual license. We are still evaluating the whole subscription-based model."
"In terms of pricing, I believe Splunk is unreasonably costly for the majority of mid and small-sized companies."
"This solution is costly. Splunk is obviously a great product, but you should only choose this product if you need all the features provided. Otherwise, if you don't need all the features to meet your requirements, there are probably other products that will be more cost-effective. It's cost versus the functionality requirement."
"It's a little bit expensive for a small to medium enterprise."
"This product could use better pricing in general."
"Splunk has always been on the expensive side."
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Comparison Review

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Feb 26, 2015
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Top Industries

By visitors reading reviews
Computer Software Company
17%
Comms Service Provider
10%
Financial Services Firm
9%
University
8%
Financial Services Firm
15%
Computer Software Company
14%
Manufacturing Company
8%
Government
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

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...
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...
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...
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 ...
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...
 

Also Known As

OSSIM
No data available
 

Overview

 

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