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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 #12 with an average rating of 7.4, while Fortinet is ranked #7 with an average rating of 8.0. AT&T holds a 2.4% mindshare in SIEM, compared to Fortinet’s 3.2% 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
  • 4,477 Views
  • 4,387 Comparison Views
80% willing to recommend
Fortinet FortiSIEM
Read 75 Fortinet FortiSIEM reviews
  • 5,483 Views
  • 4,057 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: September 2025).
Buyer's Guide
AlienVault OSSIM vs. Fortinet FortiSIEM
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
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 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 Fortinet FortiSIEM is 3.2%, up from 2.9% 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 (%)
Fortinet FortiSIEM3.2%
AlienVault OSSIM2.4%
Other94.4%
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

"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 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."
"You pay monthly for the solution. I think it's one of the best products. If you compare with other companies, like LogRhythm, etc., the top 8 or 10 CMs, I think Alien Vault has the best price-performance ratio."
"AlienVault OSSIM's GUI is very user-friendly."
"The most valuable feature is the logging capability."
"There are a lot of people you will find using OSSIM since they are also offering OTX as a service"
"Better than other SIEM solutions because almost everything can be integrated."
"The threat policies of the solution are always very advanced and the best in the market. They are very persistent in terms of keeping up with security protocols."
More AlienVault OSSIM pros
"FortiSIEM allows you to match IPs with threat intelligence feeds from sources like Kaspersky or Anomali, adding valuable context."
"It works well with medium to large-scale enterprises."
"The most valuable features of the solution is its integration with other technologies, especially its ability to collect logs from Cisco and Aruba devices along with Fortinet products."
"The solution’s IP database is awesome."
"The most valuable feature is auto-discovery. When you send logs from any device to port 514, it helps register those devices automatically."
"One of the most valuable features is that we can combine SOC and NOC operations in the same tool. We can provide NOC and SOC services in the same tool for two separate teams. There are plenty of third-party solutions that integrate with FortiSIEM. All these solutions already have a ready integration, and we have the possibility to create a custom connector for these solutions. Its reports are also very good."
"Fortinet FortiSIEM provides good detection against advanced threats."
"It's very easy for anyone to work with."
More Fortinet FortiSIEM pros
 

Cons

"I suggest more in-built rules based on modern threats and environments to make it a more competitive solution."
"Lacking in depth of reporting."
"The main area where the AlienVault product was lacking around the 2018 timeframe was in its ability to scale."
"The user interface could be improved."
"It's so hard to configure and explore something new on it."
"The solution needs more integration with cyber intelligence systems."
"AlienVault OSSIM is costly."
"The price of this solution is very high and it could be cheaper."
More AlienVault OSSIM cons
"The built-in APIs in Fortinet FortiSIEM are somewhat lacking and could be improved for better integration with external ITSM products."
"Fortinet FortiSIEM could improve to extend to several locations or sites."
"Its training can be improved. Its price also needs to be improved."
"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."
"The performance can be improved. Sometimes it takes a long time to fetch data."
"Fortinet FortiSIEM could improve by having better integration and extensions. This would benefit by allowing us to give more rules."
"I would like to see easier implementation in the future."
"It would be good if the solution offered even more configuration options, especially in relation to the VPN so that it continues to be a very flexible option."
More Fortinet FortiSIEM cons
 

Pricing and Cost Advice

"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 OSSIM is free."
"The tool's licensing costs are yearly."
"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."
"AlienVault OSSIM is an open-source solution."
"The solution is open source, so it's free to use."
"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."
More AlienVault OSSIM pricing and cost advice
"Pricing is acceptable for more than 90% of our customers, as they normally get discounts."
"The price is competitive."
"There are additional features that cost more than the standard licensing fees."
"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."
"FortiSIEM's licensing is based on EPS, and its pricing is competitive in the market."
"This is probably more on the lower cost end of the spectrum compared to competing products. Fortinet's license model is based on events per second, which makes sense, but that's not typical. It makes it very hard to calculate what your costs are going to be as you scale the platform because some log sources, such as firewall logs, are very noisy, and there are lots and lots of events per second, but some of them are not. So, it becomes a bit of a science experiment trying to guess what your costs are going to be as you scale the solution. This is where other competing products perhaps have a more straightforward license model."
"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."
More Fortinet FortiSIEM pricing and cost advice
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Top Industries

By visitors reading reviews
Computer Software Company
14%
Comms Service Provider
12%
University
9%
Financial Services Firm
8%
Computer Software Company
13%
Financial Services Firm
9%
Comms Service Provider
7%
Manufacturing Company
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 Business34
Midsize Enterprise21
Large Enterprise23
 

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?
I am not familiar with the price and cost of Fortinet FortiSIEM. I cannot tell you if it is high, expensive, or low. However, I can say that it is cost-effective as it provides everything needed.
See all answers
What needs improvement with Fortinet FortiSIEM?
Regarding Fortinet FortiSIEM, I cannot identify any specific areas for improvement because I can find everything I need. For the time being, I cannot find a real point for improvement. Everything i...
See all answers
 

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Product Reports

Buyer's Guide
AlienVault OSSIM
November 2025
AlienVault OSSIM reportDownload AlienVault OSSIM product report
Buyer's Guide
Fortinet FortiSIEM
November 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
September 2025
Free Report: AlienVault OSSIM vs. Fortinet FortiSIEM
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