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AlienVault OSSIM vs Fortinet FortiSIEM comparison

AT&T and Fortinet are both solutions in the Security Information and Event Management (SIEM) category. AT&T is ranked #11 with an average rating of 7.3, while Fortinet is ranked #7 with an average rating of 8.1. AT&T holds a 3.2% mindshare in SIEM, compared to Fortinet’s 3.3% mindshare. Additionally, 80% of AT&T users are willing to recommend the solution, compared to 82% of Fortinet users who would recommend it.
AlienVault OSSIM
Read 31 AlienVault OSSIM reviews
  • 5,143 Views
  • 5,040 Comparison Views
80% willing to recommend
Fortinet FortiSIEM
Read 75 Fortinet FortiSIEM reviews
  • 5,775 Views
  • 4,100 Comparison Views
82% willing to recommend
 

Comparison Buyer's Guide

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Executive SummaryUpdated on Sep 18, 2024

Fortinet FortiSIEM and AlienVault OSSIM are two prominent SIEM solutions. Fortinet FortiSIEM appears to have the upper hand due to its ease of deployment and customer service.

Features: Fortinet FortiSIEM offers comprehensive alerting, robust integration capabilities, and intuitive configuration. AlienVault OSSIM provides extensive threat intelligence, powerful reporting tools, and a rich feature set.

Room for Improvement: Fortinet FortiSIEM could improve scalability, refine its analytics, and enhance its documentation. AlienVault OSSIM needs to lower its learning curve, improve its documentation, and simplify its deployment.

Ease of Deployment and Customer Service: Fortinet FortiSIEM is noted for its smooth deployment process and excellent customer service, with straightforward implementation and responsive support. AlienVault OSSIM faces criticism for complex deployment and less accessible support.

Pricing and ROI: Fortinet FortiSIEM is recognized for competitive pricing and a solid return on investment. AlienVault OSSIM, although more expensive upfront, is considered worth the price for its feature-rich offering, but its complexity and support challenges can impact the overall ROI.

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To learn more, read our detailed AlienVault OSSIM vs. Fortinet FortiSIEM Report (Updated: July 2025).
Buyer's Guide
AlienVault OSSIM vs. Fortinet FortiSIEM
July 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)
11th
Average Rating
7.4
Reviews Sentiment
7.1
Number of Reviews
31
Ranking in other categories
No ranking in other categories
Fortinet FortiSIEM
Ranking in Security Information and Event Management (SIEM)
7th
Average Rating
7.6
Reviews Sentiment
5.8
Number of Reviews
75
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of August 2025, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 3.2%, down from 4.3% compared to the previous year. The mindshare of Fortinet FortiSIEM is 3.3%, up from 3.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
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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Oliver Jackson - PeerSpot reviewer
Systems monitoring enhanced by firewall and intrusion detection features
My primary use case for Fortinet FortiSIEM is systems monitoring and alerting. I use it for standard functions like log monitoring, incident detection, and notification.  My customers are mostly medium-sized enterprises ranging from engineering companies, mining companies, independent schools, and…
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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 threat alerts it gives me from time to time on harmful code within the network, or if they are generating any network traffic, are very useful."
"AlienVault OSSIM's GUI is very user-friendly."
"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."
"Network traffic analysis is highly efficient."
"Inbuilt IDS, inbuilt integration with threat intelligence platform and with vulnerability assessment modules."
"The solution is very stable. Compared to Qradar and Splunk, it's very stable."
"The solution has a very good open source community, and whenever we have problems, we are always able to resolve it online."
More AlienVault OSSIM pros
"Fortinet FortiSIEM is highly scalable. I would rate its scalability nine out of ten."
"Fortinet FortiSIEM has its own validated and authentic IP database that marks malicious IP attacks against the firewall and generates an alert for the same."
"The tool's most valuable feature stems from the fact that I can see a complete analysis, like all the incidents that have happened, and it detects everything in real-time."
"Some of our customers who use this solution have seen improvement in their connection with load balancing on both connections."
"The most valuable features for us are the built-in reports and alerts, along with the extreme flexibility in reporting and rule generation."
"The most fascinating aspect of FortiSIEM is its integration with the MITRE ATT&CK framework."
"We like the integration of all of these Fortinet platforms together. Everything is integrated well, and we are able to sell that as a service to our customers."
"The solution’s IP database is awesome."
More Fortinet FortiSIEM 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."
"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."
"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 solution needs more integration with cyber intelligence systems."
"It's so hard to configure and explore something new on it."
"The incidence reporting could be better."
"The documentation could be improved."
"The solution is not scalable."
More AlienVault OSSIM cons
"Their product support, in general, is not that great. The product support is in the same ecosystem. Their support is improving but it's not that great.vvv"
"The deployment of the platform took some time to set up and configure."
"We need to see incident reports about the event log, without events from the administrator or through human interaction."
"Customer support service could be better."
"Patching is not great - we're not getting the support we'd expect."
"Fortinet FortiSIEM could improve to extend to several locations or sites."
"When an alert triggers in Fortinet FortiSIEM, the layout or format can feel limited"
"Improvements include making it easier for users to create their normalizers. Fortinet FortiSIEM uses XML for normalizing and parsing, which can be tedious and time-consuming. A simpler way of using regex could be helpful."
More Fortinet FortiSIEM cons
 

Pricing and Cost Advice

"The licensing fees for the non-community edition are paid on an annual basis, and there are no costs in addition to this."
"We are using the community version, which can be used for free."
"AlienVault OSSIM is expensive compared to its competitors."
"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."
"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 free."
"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 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."
More AlienVault OSSIM pricing and cost advice
"We pay for a license for FortiSIEM. We pay for the license and renewal."
"If one is cheap and ten is expensive. I rate the tool's price as an eight out of ten. Compared with Splunk or Oracle, Fortinet is cheap."
"Its price can be better. We are Fortinet partners, so we can get discounts, but its price can be an issue at the beginning for others. There is a licensing scheme for every case. There are three licensing schemes that we can choose from."
"The tool is really expensive. For what the tool does for our team, the price is fair."
"Fortinet FortiSIEM is very cost-efficient compared to other SIEM solutions."
"Fortinet FortiSIEM is cheaper compared to other products."
"Pricing is acceptable for more than 90% of our customers, as they normally get discounts."
"There is a need to make yearly payments towards the licensing charges attached to the product. The free version license of the product is available for two months."
More Fortinet FortiSIEM pricing and cost advice
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Top Industries

By visitors reading reviews
Computer Software Company
15%
Comms Service Provider
11%
University
8%
Educational Organization
8%
Computer Software Company
13%
Financial Services Firm
9%
Government
7%
Comms Service Provider
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

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 do you like most about Fortinet FortiSIEM?
Fortinet FortiSIEM needs to provide better API integrations to users.
See all answers
What is your experience regarding pricing and costs for Fortinet FortiSIEM?
The pricing is reasonable, which is why it is preferred by government customers. Windows agent licenses cost around 3,000 Rupees per device per year.
See all answers
What needs improvement with Fortinet FortiSIEM?
Fortinet FortiSIEM should broaden its remediation part to include more features for incident management. Currently, to manage repetitive incidents or for remediation, I need to use a separate softw...
See all answers
 

Comparisons

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Compared 11% of the time
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Compared 11% of the time
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Compared 10% of the time
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Compared 5% of the time
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Product Reports

Buyer's Guide
AlienVault OSSIM
August 2025
AlienVault OSSIM reportDownload AlienVault OSSIM product report
Buyer's Guide
Fortinet FortiSIEM
August 2025
Fortinet FortiSIEM reportDownload Fortinet FortiSIEM product report
 

Also Known As

OSSIM
FortiSIEM, AccelOps
 

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

FortiSIEM (formerly AccelOps 4) provides an actionable security intelligence platform to monitor security, performance and compliance through a single pane of glass.

Companies around the world use FortiSIEM for the following use cases:

  • Threat management and intelligence that provide situational awareness and anomaly detection
  • Alleviating compliance mandate concerns for PCI, HIPAA and SOX
  • Managing “alert overload”
  • Handling the “too many tools” reporting issue
  • Addressing the MSPs/MSSPs pain of meeting service level agreements
Fortinet
 

Sample Customers

Council Rock School District
FortiSIEM has hundreds of customers worldwide in markets including managed services, technology, financial services, healthcare, and government. Customers include Aruba Networks, Compushare, Port of San Diego, Cleveland Indians, Infoblox, Healthways, and Referentia.
Buyer's Guide
AlienVault OSSIM vs. Fortinet FortiSIEM
July 2025
Free Report: AlienVault OSSIM vs. Fortinet FortiSIEM
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